[ { "id": 78348, "name": "Midplane neutral density profiles in the National Spherical Torus Experiment", "handle": "88435/dsp01zg64tp300", "type": "item", "link": "/rest/items/78348", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-08-10 09:02:27.278", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Stotler, Daren", "language": null }, { "key": "dc.contributor.author", "value": "Stotler, D.", "language": null }, { "key": "dc.contributor.author", "value": "F. Scotti", "language": null }, { "key": "dc.contributor.author", "value": "R.E. Bell", "language": null }, { "key": "dc.contributor.author", "value": "A. Diallo", "language": null }, { "key": "dc.contributor.author", "value": "B.P. LeBlanc", "language": null }, { "key": "dc.contributor.author", "value": "M. Podesta", "language": null }, { "key": "dc.contributor.author", "value": "A.L. Roquemore", "language": null }, { "key": "dc.contributor.author", "value": "P.W. Ross", "language": null }, { "key": "dc.date.accessioned", "value": "2015-08-18T18:14:22Z", "language": null }, { "key": "dc.date.available", "value": "2015-08-18T18:14:22Z", "language": null }, { "key": "dc.date.issued", "value": "2015-08", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01zg64tp300", "language": null }, { "key": "dc.description.abstract", "value": "Atomic and molecular density data in the outer midplane of NSTX [Ono et al., Nucl. Fusion 40, 557 (2000)] are inferred from tangential camera data via a forward modeling procedure using the DEGAS 2 Monte Carlo neutral transport code. The observed Balmer-b light emission data from 17 shots during the 2010 NSTX campaign display no obvious trends with discharge parameters such as the divertor Balmer-a emission level or edge deuterium ion density. Simulations of 12 time slices in 7 of these discharges produce molecular densities near the vacuum vessel wall of 2\u20138 \udbff\udc01 10^17 m\udbff\udc083 and atomic densities ranging from 1 to 7 \udbff\udc01 10^16 m\udbff\udc083; neither has a clear correlation with other parameters. Validation of the technique, begun in an earlier publication, is continued with an assessment of the sensitivity of the simulated camera image and neutral densities to uncertainties in the data input to the model. The simulated camera image is sensitive to the plasma profiles and virtually nothing else. The neutral densities at the vessel wall depend most strongly on the spatial distribution of the source; simulations with a localized neutral source yield densities within a factor of two of the baseline, uniform source, case. The uncertainties in the neutral densities associated with other model inputs and assumptions are\udbff\udc05 50%.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme.txt (table of contents), Stotler_PoP.zip", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": null }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4928372", "language": null }, { "key": "dc.source", "value": "Phys. Plasmas 22, 082506 (2015)", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.subject", "value": "Neutrals", "language": "en_US" }, { "key": "dc.subject", "value": "Monte-Carlo simulation", "language": "en_US" }, { "key": "dc.subject", "value": "Edge plasma diagnostics", "language": "en_US" }, { "key": "dc.title", "value": "Midplane neutral density profiles in the National Spherical Torus Experiment", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": "en_US" }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": null } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 79034, "name": "Evolution patterns and parameter regimes in edge localized modes on the National Spherical Torus Experiment", "handle": "88435/dsp01h415pc93f", "type": "item", "link": "/rest/items/79034", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-08-10 09:03:01.52", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Smith, D.R.", "language": null }, { "key": "dc.contributor", "value": "Bell, R.E.", "language": null }, { "key": "dc.contributor", "value": "Podesta, M.", "language": null }, { "key": "dc.contributor.author", "value": "Smith, D.R.", "language": null }, { "key": "dc.contributor.author", "value": "R.J. Fonck", "language": null }, { "key": "dc.contributor.author", "value": "G.R. McKee", "language": null }, { "key": "dc.contributor.author", "value": "A. Diallo", "language": null }, { "key": "dc.contributor.author", "value": "S.M. Kaye", "language": null }, { "key": "dc.contributor.author", "value": "B.P. LeBlanc", "language": null }, { "key": "dc.contributor.author", "value": "S.A. Sabbagh", "language": null }, { "key": "dc.date.accessioned", "value": "2015-09-30T16:51:27Z", "language": null }, { "key": "dc.date.available", "value": "2015-09-30T16:51:27Z", "language": null }, { "key": "dc.date.issued", "value": "2015-09", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01h415pc93f", "language": null }, { "key": "dc.description.abstract", "value": "We implement unsupervised machine learning techniques to identify characteristic evolution patterns and associated parameter regimes in edge localized mode (ELM) events observed on the National Spherical Torus Experiment. Multi-channel, localized measurements spanning the pedestal region capture the complex evolution patterns of ELM events on Alfven timescales. Some ELM events are active for less than 100~microsec, but others persist for up to 1~ms. Also, some ELM events exhibit a single dominant perturbation, but others are oscillatory. Clustering calculations with time-series similarity metrics indicate the ELM database contains at least two and possibly three groups of ELMs with similar evolution patterns. The identified ELM groups trigger similar stored energy loss, but the groups occupy distinct parameter regimes for ELM-relevant quantities like plasma current, triangularity, and pedestal height. Notably, the pedestal electron pressure gradient is not an effective parameter for distinguishing the ELM groups, but the ELM groups segregate in terms of electron density gradient and electron temperature gradient. The ELM evolution patterns and corresponding parameter regimes can shape the formulation or validation of nonlinear ELM models. Finally, the techniques and results demonstrate an application of unsupervised machine learning at a data-rich fusion facility.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Full dataset used as basis for analysis in publication.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": null }, { "key": "dc.relation", "value": "Plasma Phys. Cont. Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "Edge Localized Modes", "language": "en_US" }, { "key": "dc.subject", "value": "National Spherical Torus Experiment", "language": "en_US" }, { "key": "dc.subject", "value": "Time series evolution patterns", "language": "en_US" }, { "key": "dc.subject", "value": "Unsupervised machine learning", "language": "en_US" }, { "key": "dc.title", "value": "Evolution patterns and parameter regimes in edge localized modes on the National Spherical Torus Experiment", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": "en_US" }, { "key": "pu.depositor", "value": "Stanley, Kaye", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract numbers DE-AC02-09CH11466, DE-FG02-89ER53296 and DE-SC0001288", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 79932, "name": "Blob Structure and Motion in the Edge and SOL of NSTX", "handle": "88435/dsp01vx021h49j", "type": "item", "link": "/rest/items/79932", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-08-10 09:03:28.504", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zweben, S.J.", "language": null }, { "key": "dc.contributor.author", "value": "J.R. Myra", "language": null }, { "key": "dc.contributor.author", "value": "W.M. Davis", "language": null }, { "key": "dc.contributor.author", "value": "D.A. D'Ippolito", "language": null }, { "key": "dc.contributor.author", "value": "T.K. Gray", "language": null }, { "key": "dc.contributor.author", "value": "S.M. Kaye", "language": null }, { "key": "dc.contributor.author", "value": "B.P. LeBlanc", "language": null }, { "key": "dc.contributor.author", "value": "R.J. Maqueda", "language": null }, { "key": "dc.contributor.author", "value": "D.A. Russell", "language": null }, { "key": "dc.contributor.author", "value": "D.P. Stotler", "language": null }, { "key": "dc.date.accessioned", "value": "2016-01-04T21:59:56Z", "language": null }, { "key": "dc.date.available", "value": "2016-01-04T21:59:56Z", "language": null }, { "key": "dc.date.issued", "value": "2016-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01vx021h49j", "language": null }, { "key": "dc.description.abstract", "value": "Blob analysis dataset", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme + data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": null }, { "key": "dc.relation", "value": "Plasma Phys. Cont. Fusion Vol. 58 p. 044007 (2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1088/0741-3335/58/4/044007", "language": null }, { "key": "dc.subject", "value": "Edge Plasma", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Blob", "language": "en_US" }, { "key": "dc.subject", "value": "Turbulence", "language": "en_US" }, { "key": "dc.title", "value": "Blob Structure and Motion in the Edge and SOL of NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": "en_US" }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 94237, "name": "Study of the impact of pre- and real-time deposition of lithium on plasma performance on NSTX", "handle": "88435/dsp018049g784n", "type": "item", "link": "/rest/items/94237", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-01-28 17:46:19.659", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Canal, G.P.", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.contributor.author", "value": "Evans, T.E.", "language": null }, { "key": "dc.contributor.author", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.author", "value": "Mansfield, D.K.", "language": null }, { "key": "dc.date.accessioned", "value": "2019-01-28T22:46:18Z", "language": null }, { "key": "dc.date.available", "value": "2019-01-28T22:46:18Z", "language": null }, { "key": "dc.date.issued", "value": "2019-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp018049g784n", "language": null }, { "key": "dc.description.abstract", "value": "The efficiency of two lithium (Li) injection methods used on the National Spherical Torus Experiment (NSTX) are compared in terms of the amount of Li used to produce equivalent plasma performance improvements, namely Li evaporation over the divertor plates, prior to the initiation of the discharge, and real-time Li injection directly into the plasma scrape-off layer during the discharge. The measurements show that the real-time method can affect the energy confinement and edge stability of NSTX plasmas in a more efficient way than the Li evaporation method as it requires only a fraction of the amount of Li used by the evaporation method to produce similar improvements.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "IEEE Transactions on Plasma Science", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.subject", "value": "Lithium", "language": "en_US" }, { "key": "dc.subject", "value": "Performance", "language": "en_US" }, { "key": "dc.subject", "value": "Stability", "language": "en_US" }, { "key": "dc.title", "value": "Study of the impact of pre- and real-time deposition of lithium on plasma performance on NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 84912, "name": "Nonlinear fishbone dynamics in spherical tokamaks", "handle": "88435/dsp01kd17cw34n", "type": "item", "link": "/rest/items/84912", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-03-22 01:11:25.679", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Wang, F.", "language": null }, { "key": "dc.contributor.author", "value": "Fu, G.Y.", "language": null }, { "key": "dc.contributor.author", "value": "Shen, W.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-12-22T19:41:57Z", "language": null }, { "key": "dc.date.available", "value": "2016-12-22T19:41:57Z", "language": null }, { "key": "dc.date.issued", "value": "2017-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01kd17cw34n", "language": null }, { "key": "dc.description.abstract", "value": "Linear and nonlinear kinetic-MHD hybrid simulations have been carried out to investigate linear stability and nonlinear dynamics of beam-driven fishbone instability in spherical tokamak plasmas. Realistic NSTX parameters with finite toroidal rotation were used. The results show that the fishbone is driven by both trapped and passing particles. The instability drive of passing particles is comparable to that of trapped particles in the linear regime. The effects of rotation are destabilizing and a new region of instability appears at higher qmin (>1.5) values, qmin being the minimum of safety factor profile. In the nonlinear regime,\r\nthe mode saturates due to flattening of beam ion distribution, and this persists after initial saturation while mode frequency chirps down in such a way that the resonant trapped particles move out radially and keep in resonance with the mode. Correspondingly, the flattening region of beam ion distribution expands radially outward. A substantial fraction of initially non- resonant trapped particles become resonant around the time of mode saturation and keep in resonance with the mode as frequency chirps down. On the other hand, the fraction of resonant passing particles is significantly smaller than that of trapped particles. Our analysis shows that trapped particles provide the main drive to the mode in the nonlinear regime.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion, vol. 57, p. 016034, January 2017", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "doi:10.1088/0029-5515/57/1/016034", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.subject", "value": "Fishbone", "language": "en_US" }, { "key": "dc.subject", "value": "Frequency chirping", "language": "en_US" }, { "key": "dc.subject", "value": "Nonlinear dynamics", "language": "en_US" }, { "key": "dc.subject", "value": "Wave-particle interaction", "language": "en_US" }, { "key": "dc.title", "value": "Nonlinear fishbone dynamics in spherical tokamaks", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 90553, "name": "Blob-hole correlation model for edge turbulence and comparisons with NSTX GPI data", "handle": "88435/dsp01x346d687k", "type": "item", "link": "/rest/items/90553", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-07-06 12:01:28.376", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Myra, J.R.", "language": null }, { "key": "dc.contributor.author", "value": "Zweben, S.J.", "language": null }, { "key": "dc.contributor.author", "value": "Russell, D.A.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-05-01T17:54:14Z", "language": null }, { "key": "dc.date.available", "value": "2018-05-01T17:54:14Z", "language": null }, { "key": "dc.date.issued", "value": "2018-07", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01x346d687k", "language": null }, { "key": "dc.description.abstract", "value": "Gas puff imaging (GPI) observations made in NSTX [Zweben S J, et al., 2017 Phys. Plasmas 24 102509] have revealed two-point spatial correlations of edge and scrape-off layer turbulence in the plane perpendicular to the magnetic field. A common feature is the occurrence of dipole-like patterns with significant regions of negative correlation. In this paper, we explore the possibility that these dipole patterns may be due to blob-hole pairs. Statistical methods are applied to determine the two-point spatial correlation that results from a model of blob-hole pair formation. It is shown that the model produces dipole correlation patterns that are qualitatively similar to the GPI data in several respects. Effects of the reference location (confined surfaces or scrape-off layer), a superimposed random background, hole velocity and lifetime, and background sheared flows are explored and discussed with respect to experimental observations. Additional analysis of the experimental GPI dataset is performed to further test this blob-hole correlation model. A time delay two-point spatial correlation study did not reveal inward propagation of the negative correlation structures that were postulated to correspond to holes in the data nor did it suggest that the negative correlation structures are due to neutral shadowing. However, tracing of the highest and lowest values (extrema) of the normalized GPI fluctuations shows strong evidence for mean inward propagation of minima and outward propagation of maxima, in qualitative agreement with theoretical expectations. Other properties of the experimentally observed extrema are discussed.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Physics and Controlled Fusion, Vol. 60, p. 075015 (July 2018)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1361-6587/aac4fc", "language": null }, { "key": "dc.title", "value": "Blob-hole correlation model for edge turbulence and comparisons with NSTX GPI data", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 85707, "name": "Energy Exchange Dynamics across L-H Transitions in NSTX", "handle": "88435/dsp01f1881p40x", "type": "item", "link": "/rest/items/85707", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-19 12:17:55.502", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "Banerjee, S.", "language": null }, { "key": "dc.contributor.author", "value": "Zweben, S.", "language": null }, { "key": "dc.contributor.author", "value": "Stoltzfus-Dueck, T.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-03-28T15:02:40Z", "language": null }, { "key": "dc.date.available", "value": "2017-03-28T15:02:40Z", "language": null }, { "key": "dc.date.issued", "value": "2017-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01f1881p40x", "language": null }, { "key": "dc.description.abstract", "value": "We studied the energy exchange dynamics across the low-to-high-confinement (L-H) in NSTX discharges using the gas-puff imaging (GPI) diagnotic. The investigation focused on the energy exchange between flows and turbulence, to help clarify the mechanism of the L-H transition. We apply this study to three type of heating schemes, including a total of 17 shots from the NSTX 2010 campaign run. Results show that the edge fluctuation characteristics (fluctuation levels, radial and poloidal correlation lengths) measured using GPI do not vary just prior to the H-mode transition, but change after the transition. Using a velocimetry approach (orthogonal-programming decomposition), velocity fields of a 24 $\\times$ 30 cm GPI view during the L-H transition were obtained with good spatial ($\\sim$1 cm) and temporal ($\\sim$2.5 $\\mu$s) resolutions. Analysis using these velocity fields shows that the production term is systematically negative just prior to the L-H transition indicating transfer from mean flows to turbulence, which is inconsistent with the predator-prey paradigm. Moreover, using the inferred absolute value of the production term, an estimate of the L-H transition duration is found to be 25 ms, which is much larger than the measured duration. These discrepancies are further reinforced by consideration of the ratio between the kinetic energy in the mean flow to the thermal free energy, which is estimated to be much less than 1, suggesting again that turbulence depletion mechanism may not be playing an important role in the transition to the H-mode. Although the Reynolds work is too small to directly deplete the turbulent free energy reservoir, order-of-magnitude analysis shows that the Reynolds stress may still make a non-negligible contribution to the observed poloidal flows.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion vol. 57 p. 066050 (June 2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://doi.org/10.1066/1741-4326/aa6a24", "language": null }, { "key": "dc.subject", "value": "Magnetic confinement", "language": "en_US" }, { "key": "dc.subject", "value": "L-H transition", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.title", "value": "Energy Exchange Dynamics across L-H Transitions in NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 88912, "name": "A multi-machine scaling of halo current rotation", "handle": "88435/dsp01sn00b1428", "type": "item", "link": "/rest/items/88912", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-10-26 04:06:06.826", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Myers, C.E.", "language": null }, { "key": "dc.contributor.author", "value": "Eidietis, N.W.", "language": null }, { "key": "dc.contributor.author", "value": "Gerasimov, S.N.", "language": null }, { "key": "dc.contributor.author", "value": "Gerhardt, S.Pl.", "language": null }, { "key": "dc.contributor.author", "value": "Granetz, R.S.", "language": null }, { "key": "dc.contributor.author", "value": "Hender, T.C.", "language": null }, { "key": "dc.contributor.author", "value": "Pautasso, G.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-10-25T21:27:59Z", "language": null }, { "key": "dc.date.available", "value": "2017-10-25T21:27:59Z", "language": null }, { "key": "dc.date.issued", "value": "2017-10", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01sn00b1428", "language": null }, { "key": "dc.description.abstract", "value": "Halo currents generated during unmitigated tokamak disruptions are known to develop rotating asymmetric features that are of great concern to ITER because they can dynamically amplify the mechanical stresses on the machine. This paper presents a multi-machine analysis of these phenomena. More specifically, data from C-Mod, NSTX, ASDEX Upgrade, DIII-D, and JET are used to develop empirical scalings of three key quantities: (1) the machine-specific minimum current quench time, tauCQ; (2) the halo current rotation duration, trot; and (3) the average halo current rotation frequency, . These data reveal that the normalized rotation duration, trot/tauCQ, and the average rotation velocity, , are surprisingly consistent from machine to machine. Furthermore, comparisons between carbon and metal wall machines show that metal walls have minimal impact on the behavior of rotating halo currents. Finally, upon projecting to ITER, the empirical scalings indicate that substantial halo current rotation above = 20 Hz is to be expected. More importantly, depending on the projected value of tauCQ in ITER, substantial rotation could also occur in the resonant frequency range of 6-20 Hz. As such, the possibility of damaging halo current rotation during unmitigated disruptions in ITER cannot be ruled out.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion (October 2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/aa958b", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamaks", "language": "en_US" }, { "key": "dc.subject", "value": "Disruptions", "language": "en_US" }, { "key": "dc.subject", "value": "Halo currents", "language": "en_US" }, { "key": "dc.title", "value": "A multi-machine scaling of halo current rotation", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "kaye, S.M.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 88970, "name": "Plasma measurements of the Fe XVII L-shell emission and blending with F VIII and F IX", "handle": "88435/dsp01d504rn98q", "type": "item", "link": "/rest/items/88970", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-11-02 16:00:50.672", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Beiersdorfer, P.", "language": null }, { "key": "dc.contributor.author", "value": "Lepson, J.K.", "language": null }, { "key": "dc.contributor.author", "value": "Gu, M.F.", "language": null }, { "key": "dc.contributor.author", "value": "Bitter, M.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-11-02T20:00:50Z", "language": null }, { "key": "dc.date.available", "value": "2017-11-02T20:00:50Z", "language": null }, { "key": "dc.date.issued", "value": "2017-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01d504rn98q", "language": null }, { "key": "dc.description.abstract", "value": "We measured the L-shell emission spectrum of Fe XVII in a low-density, low-gradient magnetically confined laboratory plasma that contains predominantly C, O, Fe, and Ni as trace elements and find excellent agreement with the relative spectral emission obtained in solar and astrophysical observations. However, we obtained spectra that appear to have an usually large 1s^22s^22p^5_{1/2}3d_{3/2} --> 1s^22s^22p^6 Fe XVII resonance transition, commonly labeled 3C, from hot plasmas that also contain F. The wavelength of the Ly-alpha feature of F IX is coincident with the wavelength of the Fe XVII line 3C within one part in 538, and its flux, therefore, enhances the Fe XVII resonance line. Moreover, the resonance and forbidden lines of F VIII are close to the 3s --> 2p transitions in Fe XVII, and may further alter the inferred apparent Fe XVII line ratios, particularly in spectrometers with moderate spectral resolution. The enhanced emission of line 3C, thus, can serve as a new spectral diagnostic for the detection of fluorine in astrophysical plasmas.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Astrophysical Journal (November 2017)", "language": "en_US" }, { "key": "dc.subject", "value": "Atomic processes", "language": "en_US" }, { "key": "dc.subject", "value": "X-ray line formation", "language": "en_US" }, { "key": "dc.subject", "value": "Stellar corona", "language": "en_US" }, { "key": "dc.subject", "value": "iron emission", "language": "en_US" }, { "key": "dc.subject", "value": "flourine emission", "language": "en_US" }, { "key": "dc.title", "value": "Plasma measurements of the Fe XVII L-shell emission and blending with F VIII and F IX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 80489, "name": "Observation of quasi-coherent edge fluctuations in Ohmic plasmas on NSTX", "handle": "88435/dsp0170795b055", "type": "item", "link": "/rest/items/80489", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-19 12:12:45.056", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Banerjee, S.", "language": null }, { "key": "dc.contributor.author", "value": "A. Diallo", "language": null }, { "key": "dc.contributor.author", "value": "S.J. Zweben", "language": null }, { "key": "dc.date.accessioned", "value": "2016-04-04T20:48:13Z", "language": null }, { "key": "dc.date.available", "value": "2016-04-04T20:48:13Z", "language": null }, { "key": "dc.date.issued", "value": "2016-04", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp0170795b055", "language": null }, { "key": "dc.description.abstract", "value": "A quasi-coherent mode with frequency f = 40 kHz is observed in Ohmic plasmas in NSTX with the gas puff imaging diagnostic (GPI). This mode is located predominantly just inside the separatrix, with a maximum fluctuation amplitude similar to that of the broadband turbulence in the same frequency range. The quasi-coherent mode has a poloidal wavelength 16 cm and a poloidal velocity 49 km/s in the electron diamagnetic direction, which are similar to the characteristics expected from a linear drift-wave like mode in the edge.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and hdf5 files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas, vol. 23, p. 044502, April 2016", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "doi: 10.1063/1.4946871", "language": "en_US" }, { "key": "dc.subject", "value": "Turbulence", "language": "en_US" }, { "key": "dc.title", "value": "Observation of quasi-coherent edge fluctuations in Ohmic plasmas on NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": "en_US" }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 87751, "name": "Sensitivity of WallDYN material migration modeling to uncertainties in mixed-material surface binding energies", "handle": "88435/dsp01br86b619v", "type": "item", "link": "/rest/items/87751", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-21 04:06:50.801", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Nichols, J.H.", "language": null }, { "key": "dc.contributor.author", "value": "Jaworski, M.A.", "language": null }, { "key": "dc.contributor.author", "value": "Schmid, K.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-07-20T14:13:03Z", "language": null }, { "key": "dc.date.available", "value": "2017-07-20T14:13:03Z", "language": null }, { "key": "dc.date.issued", "value": "2017", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01br86b619v", "language": null }, { "key": "dc.description.abstract", "value": "The WallDYN package has recently been applied to a number of tokamaks to self-consistently model\r\nthe evolution of mixed-material plasma facing surfaces. A key component of the WallDYN model is the\r\nconcentration-dependent surface sputtering rate, calculated using SDTRIM.SP. This modeled sputtering\r\nrate is strongly influenced by the surface binding energies (SBEs) of the constituent materials, which\r\nare well known for pure elements but often are poorly constrained for mixed-materials. This work examines\r\nthe sensitivity of WallDYN surface evolution calculations to different models for mixed-material\r\nSBEs, focusing on the carbon/lithium/oxygen/deuterium system present in NSTX. A realistic plasma background is reconstructed from a high density, H-mode NSTX discharge, featuring an attached outer strike\r\npoint with local density and temperature of 4e20 m^-3 and 4 eV, respectively. It is found that various\r\nmixed-material SBE models lead to significant qualitative and quantitative changes in the surface evolution\r\nprofile at the outer divertor, with the highest leverage parameter being the C-Li binding model.\r\nUncertainties of order 50%, appearing on time scales relevant to tokamak experiments, highlight the importance of choosing an appropriate mixed-material sputtering representation when modeling the surface\r\nevolution of plasma facing components. These results are generalized to other fusion-relevant materials\r\nwith different ranges of SBEs.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Published online in Nuclear Materials and Energy (2017)", "language": "en_US" }, { "key": "dc.subject", "value": "WALLDYN", "language": "en_US" }, { "key": "dc.subject", "value": "DIVIMP", "language": "en_US" }, { "key": "dc.subject", "value": "OEDGE", "language": "en_US" }, { "key": "dc.subject", "value": "Mixed materials", "language": "en_US" }, { "key": "dc.subject", "value": "Migration", "language": "en_US" }, { "key": "dc.subject", "value": "Sputtering", "language": "en_US" }, { "key": "dc.subject", "value": "TRIM", "language": "en_US" }, { "key": "dc.subject", "value": "Carbon", "language": "en_US" }, { "key": "dc.subject", "value": "Lithium", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.title", "value": "Sensitivity of WallDYN material migration modeling to uncertainties in mixed-material surface binding energies", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 84484, "name": "Theory based scaling of edge turbulence and implications for the scrape-off layer width", "handle": "88435/dsp018p58pg426", "type": "item", "link": "/rest/items/84484", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-11-14 11:56:05.4", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Myra, J.R.", "language": null }, { "key": "dc.contributor.author", "value": "Russell, D.A.", "language": null }, { "key": "dc.contributor.author", "value": "Zweben, S.J.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-10-27T19:16:01Z", "language": null }, { "key": "dc.date.available", "value": "2016-10-27T19:16:01Z", "language": null }, { "key": "dc.date.issued", "value": "2016-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp018p58pg426", "language": null }, { "key": "dc.description.abstract", "value": "Turbulence and plasma parameter data from the National Spherical Torus Experiment NSTX [M. Ono, S.M. Kaye, Y.-K.M. Peng, G. Barnes et al., Nucl. Fusion 40, 557 (2000)] is examined and interpreted based on various theoretical estimates. In particular, quantities of interest for assessing the role of turbulent transport on the midplane scrape-off layer heat flux width are assessed. Because most turbulence quantities exhibit large scatter and little scaling within a given operation mode, this paper focuses on length and time scales and dimensionless parameters between operational modes including Ohmic, low (L), and high (H) modes using a large NSTX edge turbulence database [S.J. Zweben, W.M. Davis, S.M. Kaye, J.R. Myra et al., Nucl. Fusion 55, 093035 (2015)]. These are compared with theoretical estimates for drift and interchange rates, profile modification saturation levels, a resistive ballooning condition, and dimensionless parameters characterizing L and high H mode conditions. It is argued that the underlying instability physics governing edge turbulence in different operational modes is in fact similar, and is consistent with curvature-driven drift ballooning. Saturation physics, however, is dependent on the operational mode. Five dimensionless parameters for drift-interchange turbulence are obtained and employed to assess the important of turbulence in setting the scrape-off layer heat flux width lambda_q and its scaling. An explicit proportionality of the width lambda_q to safety factor and major radius (qR) is obtained under these conditions. Quantitative estimates and reduced model numerical simulations suggest that the turbulence mechanism is not negligible in determining lambda_q in NSTX, at least for high plasma current discharges.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas, Vol. 23, p. 112502 (November 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4966564", "language": null }, { "key": "dc.subject", "value": "Edge turbulence", "language": "en_US" }, { "key": "dc.subject", "value": "Transport", "language": "en_US" }, { "key": "dc.subject", "value": "Scrape-off layer", "language": "en_US" }, { "key": "dc.subject", "value": "Heat flux", "language": "en_US" }, { "key": "dc.title", "value": "Theory based scaling of edge turbulence and implications for the scrape-off layer width", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 81748, "name": "Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry", "handle": "88435/dsp01n870zt23w", "type": "item", "link": "/rest/items/81748", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-08-10 09:06:21.955", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Coury, M.", "language": null }, { "key": "dc.contributor.author", "value": "Guttenfelder, W.", "language": null }, { "key": "dc.contributor.author", "value": "Mikkelsen, D.", "language": null }, { "key": "dc.contributor.author", "value": "Canik, J.", "language": null }, { "key": "dc.contributor.author", "value": "Canal, G.", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "Kaye, S.", "language": null }, { "key": "dc.contributor.author", "value": "Kramer, G.", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-06-15T15:03:44Z", "language": null }, { "key": "dc.date.available", "value": "2016-06-15T15:03:44Z", "language": null }, { "key": "dc.date.issued", "value": "2016-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01n870zt23w", "language": null }, { "key": "dc.description.abstract", "value": "Linear (local) gyrokinetic predictions of edge microinstabilities in highly shaped, lithiated and non-lihiated NSTX discharges are reported using the gyrokinetic code GS2. Microtearing modes dominate the non-lithiated pedestal top. The stabilization of these modes at the lithiated pedestal top enables the electron temperature pedestal to extend further inwards, as observed experimentally. Kinetic ballooning modes are found to be unstable mainly at the mid-pedestal of both types of discharges, with unstable trapped electron modes nearer the separatrix region. At electron wavelengths, ETG modes are found to be unstable from mid-pedestal outwards for eta(e,exp)~2.2, with higher growth rates for the lithiated discharge. Near the separatrix, the critical temperature gradient for driving ETG modes is reduced in the presence of lithium, reflecting the reduction of the lithiated density gradients observed experimentally. A preliminary linear study in the edge of non-lithiated discharges shows that the equilibrium shaping alters the electrostatic modes stability, found more unstable at high plasma shaping.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas, Vol. 23, p. 062520 (June 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4954911", "language": null }, { "key": "dc.subject", "value": "Local linear gyrokinetic simulations", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.title", "value": "Linear gyrokinetic simulations of microinstabilities within the pedestal region of H-mode NSTX discharges in a highly shaped geometry", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 81731, "name": "Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment", "handle": "88435/dsp015d86p263n", "type": "item", "link": "/rest/items/81731", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-08-10 09:05:23.602", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Carlsson, J.", "language": null }, { "key": "dc.contributor.author", "value": "Wilson, J.R.", "language": null }, { "key": "dc.contributor.author", "value": "Hosea, J.", "language": null }, { "key": "dc.contributor.author", "value": "Greenough, N.", "language": null }, { "key": "dc.contributor.author", "value": "Perkins, R.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-06-14T19:43:10Z", "language": null }, { "key": "dc.date.available", "value": "2016-06-14T19:43:10Z", "language": null }, { "key": "dc.date.issued", "value": "2016-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp015d86p263n", "language": null }, { "key": "dc.description.abstract", "value": "Third-order spectral analysis, in particular the auto bicoherence, was applied to probe signals from high-harmonic fast-wave heating experiments in the National Spherical Torus Experiment. Strong evidence was found for parametric decay of the 30 MHz radio-frequency (RF) pump wave, with a low-frequency daughter wave at 2.7 MHz, the local majority-ion cyclotron frequency. The primary decay modes have auto bicoherence values around 0.85, very close to the theoretical value of one, which corresponds to total phase coherence with the pump wave. The threshold RF pump power for onset of parametric decay was found to be between 200 kW and 400 kW.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas, Vol 23, p 062519 (June 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4954825", "language": null }, { "key": "dc.subject", "value": "Bicoherence", "language": "en_US" }, { "key": "dc.subject", "value": "Third order spectral analysis", "language": "en_US" }, { "key": "dc.subject", "value": "PDI", "language": "en_US" }, { "key": "dc.subject", "value": "HHFW", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.title", "value": "Phase coherence of parametric-decay modes during high-harmonic fast-wave heating in the National Spherical Torus Experiment", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 87767, "name": "Computation of Alfv\u00e8n eigenmode stability and saturation through a reduced fast ion transport model in the TRANSP tokamak transport code", "handle": "88435/dsp0100000264v", "type": "item", "link": "/rest/items/87767", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-22 04:07:44.358", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Podesta, M.", "language": null }, { "key": "dc.contributor.author", "value": "Gorelenkova, M.", "language": null }, { "key": "dc.contributor.author", "value": "Gorelenkov, N.N.", "language": null }, { "key": "dc.contributor.author", "value": "White, R.B.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-07-21T17:31:53Z", "language": null }, { "key": "dc.date.available", "value": "2017-07-21T17:31:53Z", "language": null }, { "key": "dc.date.issued", "value": "2017-09", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp0100000264v", "language": null }, { "key": "dc.description.abstract", "value": "Alfv\u00e9nic instabilities (AEs) are well known as a potential cause of enhanced fast ion transport in fusion devices. Given a specific plasma scenario, quantitative predictions of (i) expected unstable AE spectrum and (ii) resulting fast ion transport are required to prevent or mitigate the AE- induced degradation in fusion performance. Reduced models are becoming an attractive tool to analyze existing scenarios as well as for scenario prediction in time-dependent simulations. In this work, a neutral beam heated NSTX discharge is used as reference to illustrate the potential of a reduced fast ion transport model, known as kick model, that has been recently implemented for interpretive and predictive analysis within the framework of the time-dependent tokamak transport code TRANSP. Predictive capabilities for AE stability and saturation amplitude are first assessed, based on given thermal plasma profiles only. Predictions are then compared to experimental results, and the interpretive capabilities of the model further discussed. Overall, the reduced model captures the main properties of the instabilities and associated effects on the fast ion population. Additional information from the actual experiment enables further tuning of the model\u2019s parameters to achieve a close match with measurements.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Physics and Controlled Fusion, Vol. 59, p. 095006 (September 2017)", "language": "en_US" }, { "key": "dc.subject", "value": "Neutral beam injection", "language": "en_US" }, { "key": "dc.subject", "value": "Energetic particle transport", "language": "en_US" }, { "key": "dc.subject", "value": "Reduced transport models", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX spherical torus", "language": "en_US" }, { "key": "dc.subject", "value": "Alfven instabilities", "language": "en_US" }, { "key": "dc.title", "value": "Computation of Alfv\u00e8n eigenmode stability and saturation through a reduced fast ion transport model in the TRANSP tokamak transport code", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 88457, "name": "Two-dimensional turbulence cross-correlation functions in the edge of NSTX", "handle": "88435/dsp01ft848t262", "type": "item", "link": "/rest/items/88457", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-09-08 04:06:30.202", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zweben, S.J.", "language": null }, { "key": "dc.contributor.author", "value": "Stotler, D.P.", "language": null }, { "key": "dc.contributor.author", "value": "Scotti, F.", "language": null }, { "key": "dc.contributor.author", "value": "Myra, J.R.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-09-07T14:21:47Z", "language": null }, { "key": "dc.date.available", "value": "2017-09-07T14:21:47Z", "language": null }, { "key": "dc.date.issued", "value": "2017-09", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01ft848t262", "language": null }, { "key": "dc.description.abstract", "value": "The 2-D radial vs. poloidal cross-correlation functions of edge plasma turbulence were measured near the outer midplane using the gas puff imaging (GPI) diagnostic on NSTX. These correlation functions were evaluated at radii r= 0 cm, \u00b13 cm, and \u00b16 cm from the separatrix and poloidal locations p=0 cm and \u00b17.5 cm from the GPI poloidal center line for 20 different shots. The ellipticity \u03b5 and tilt angle \u03c6 of the positive cross- correlation regions, and the minimum negative cross-correlation \u201ccmin\u201d and total negative over positive values \u201cneg/pos\u201d were evaluated for each of these cases. The average results over this data set were \u03b5=2.2\u00b10.9, \u03c6=87\u00b134o (i.e. poloidally oriented), cmin= -0.30\u00b10.15, and neg/pos=0.25\u00b10.24. Thus there was significant variation in these correlation results within this database, with dependences on the location within the image, the magnetic geometry, and the plasma parameters. Possible causes for this variation are discussed, including the misalignment of the GPI view with the local B field line, the magnetic shear of field lines in the edge, the poloidal flow shear of the turbulence, blob-hole correlations, and the neutral density \u2018shadowing\u2019 effect in GPI.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas (2017)", "language": "en_US" }, { "key": "dc.subject", "value": "Turbulence", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.subject", "value": "Gas puff imaging", "language": "en_US" }, { "key": "dc.title", "value": "Two-dimensional turbulence cross-correlation functions in the edge of NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 80513, "name": "Quasi-linear gyrokinetic predictions of the Coriolis momentum pinch in NSTX", "handle": "88435/dsp0137720g13x", "type": "item", "link": "/rest/items/80513", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-07-06 13:47:45.569", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Guttenfelder W.", "language": null }, { "key": "dc.contributor.author", "value": "S.M. Kaye", "language": null }, { "key": "dc.contributor.author", "value": "Y. Ren", "language": null }, { "key": "dc.contributor.author", "value": "W. Solomon", "language": null }, { "key": "dc.contributor.author", "value": "R.E. Bell", "language": null }, { "key": "dc.contributor.author", "value": "J. Candy", "language": null }, { "key": "dc.contributor.author", "value": "S.P. Gerhardt", "language": null }, { "key": "dc.contributor.author", "value": "B.P. LeBlanc", "language": null }, { "key": "dc.contributor.author", "value": "H. Yuh", "language": null }, { "key": "dc.date.accessioned", "value": "2016-04-06T13:47:35Z", "language": null }, { "key": "dc.date.available", "value": "2016-04-06T13:47:35Z", "language": null }, { "key": "dc.date.issued", "value": "2016-04", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp0137720g13x", "language": null }, { "key": "dc.description.abstract", "value": "This paper presents quasi-linear gyrokinetic predictions of the Coriolis momentum pinch for low aspect-ratio NSTX H-modes where previous experimental measurements were focused. Local, linear calculations predict that in the region of interest (just outside the mid-radius) of these relatively high-beta plasmas, profiles are most unstable to microtearing modes that are only effective in transporting electron energy. However, sub-dominant electromagnetic and electrostatic ballooning modes are also unstable, which are effective at transporting energy, particles and momentum. The quasi-linear prediction of transport from these weaker ballooning modes, assuming they contribute transport in addition to that from microtearing modes in a nonlinear turbulent state, leads to a very small or outward convection of momentum, inconsistent with the experimentally measured inward pinch, and opposite to predictions in conventional aspect ratio tokamaks. Additional predictions of a low beta L-mode plasma, unstable to more traditional electrostatic ion temperature gradient-trapped electron mode instability, show that the Coriolis pinch is inward but remains relatively weak and insensitive to many parameter variations. The weak or outward pinch predicted in NSTX plasmas appears to be at least partially correlated to changes in the parallel mode structure that occur at finite beta and low aspect ratio, as discussed in previous theories. The only conditions identified where a stronger inward pinch is predicted occur either in the purely electrostatic limit or if the aspect ratio is increased. As the Coriolis pinch cannot explain the measured momentum pinch, additional theoretical momentum transport mechanisms are discussed that may be potentially important.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Readme and data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas, Vol 23, p.052508 (May 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4948791", "language": null }, { "key": "dc.subject", "value": "Tokamak Turbulence Transport Momentum pinch", "language": "en_US" }, { "key": "dc.title", "value": "Quasi-linear gyrokinetic predictions of the Coriolis momentum pinch in NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": "en_US" }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 82348, "name": "Saturation of Alfven modes in tokamaks", "handle": "88435/dsp01np193c61s", "type": "item", "link": "/rest/items/82348", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-04-04 09:21:43.348", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "White, R", "language": null }, { "key": "dc.contributor.author", "value": "Gorelenkov, N.", "language": null }, { "key": "dc.contributor.author", "value": "Gorelenkova, M.", "language": null }, { "key": "dc.contributor.author", "value": "Podesta, M.", "language": null }, { "key": "dc.contributor.author", "value": "Ethier, S.", "language": null }, { "key": "dc.contributor.author", "value": "Chen, Y.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-06-29T13:41:27Z", "language": null }, { "key": "dc.date.available", "value": "2016-06-29T13:41:27Z", "language": null }, { "key": "dc.date.issued", "value": "2016-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01np193c61s", "language": null }, { "key": "dc.description.abstract", "value": "Growth of Alfven modes driven unstable by a \r\ndistribution of high energy particles up to saturation \r\nis investigated with a guiding \r\ncenter code, using numerical eigenfunctions produced by linear theory and \r\na numerical high energy particle distribution, \r\nin order to make detailed comparison with experiment and with models for \r\nsaturation amplitudes and the modification of beam profiles. Two \r\ninnovations are introduced. First, a very noise free means of obtaining \r\nthe mode-particle energy and momentum transfer is introduced, and \r\nsecondly, a spline representation of the actual beam particle \r\ndistribution is used.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Physics and Controlled Fusion, Vol. 58, page 115007 (November 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1088/0741-3335/58/11/115007", "language": null }, { "key": "dc.subject", "value": "TAE modes", "language": "en_US" }, { "key": "dc.subject", "value": "Saturation", "language": "en_US" }, { "key": "dc.title", "value": "Saturation of Alfven modes in tokamaks", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 82367, "name": "Collisional dependence of Alfven mode saturation in tokamaks", "handle": "88435/dsp01hx11xh689", "type": "item", "link": "/rest/items/82367", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-11-14 11:57:33.049", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zhou, M.", "language": null }, { "key": "dc.contributor.author", "value": "White, R.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-06-29T13:42:08Z", "language": null }, { "key": "dc.date.available", "value": "2016-06-29T13:42:08Z", "language": null }, { "key": "dc.date.issued", "value": "2016-12", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01hx11xh689", "language": null }, { "key": "dc.description.abstract", "value": "Saturation of \\alfven modes driven unstable by a \r\ndistribution of high energy particles as a function of collisionality\r\nis investigated with a guiding \r\ncenter code, using numerical eigenfunctions produced by linear theory and \r\nnumerical high energy particle distributions. The most important \r\nresonance is found and it is shown that when the resonance domain is bounded, \r\nnot allowing particles to collisionlessly escape, the saturation amplitude \r\nis given by the balance of the resonance mixing time with the time for \r\nnearby particles to collisionally diffuse across the resonance width. \r\nSaturation amplitudes are in agreement with theoretical predictions as \r\nlong as the mode amplitude is not so large that it produces stochastic \r\nloss from the resonance domain.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Physics and Controlled Fusion, vol. 58 p. 125006, (December 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "doi:10.1088/0741-3335/58/12/125006", "language": null }, { "key": "dc.subject", "value": "TAE modes", "language": "en_US" }, { "key": "dc.subject", "value": "Saturation", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamaks", "language": "en_US" }, { "key": "dc.title", "value": "Collisional dependence of Alfven mode saturation in tokamaks", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 80651, "name": "Phase space effects on fast ion distribution function modeling in tokamaks", "handle": "88435/dsp011z40kw24q", "type": "item", "link": "/rest/items/80651", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-06-15 11:32:03.755", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.advisor", "value": "R.B. White", "language": null }, { "key": "dc.contributor.author", "value": "Podesta, M.", "language": null }, { "key": "dc.contributor.author", "value": "M. Gorelenkova", "language": null }, { "key": "dc.contributor.author", "value": "E.D. Fredrickson", "language": null }, { "key": "dc.contributor.author", "value": "N.N. Gorelenkov", "language": null }, { "key": "dc.date.accessioned", "value": "2016-04-18T16:44:23Z", "language": null }, { "key": "dc.date.available", "value": "2016-04-18T16:44:23Z", "language": null }, { "key": "dc.date.issued", "value": "2016-04", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp011z40kw24q", "language": null }, { "key": "dc.description.abstract", "value": "Integrated simulations of tokamak discharges typically rely on classical physics to model energetic particle (EP) dynamics. However, there are numerous cases in which energetic particles can suffer additional transport that is not classical in nature. Examples include transport by applied 3D magnetic perturbations and, more notably, by plasma instabilities. Focusing on the effects of instabilities, ad-hoc models can empirically reproduce increased transport, but the choice of transport coefficients is usually somehow arbitrary. New approaches based on physics-based reduced models are being developed to address those issues in a simplified way, while retaining a more correct treatment of resonant wave-particle interactions. The kick model implemented in the tokamak transport code TRANSP is an example of such reduced models. It includes modifications of the EP distribution by instabilities in real and velocity space, retaining correlations between transport in energy and space typical of resonant EP transport. The relevance of EP phase space modifications by instabilities is first discussed in terms of predicted fast ion distribution. Results are compared with those from a simple, ad-hoc diffusive model. It is then shown that the phase-space resolved model can also provide additional insight into important issues such as internal consistency of the simulations and mode stability through the analysis of the power exchanged between energetic particles and the instabilities.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas, Vol. 23, p. 056106 (2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4946027", "language": "en_US" }, { "key": "dc.subject", "value": "Integrated modeling", "language": "en_US" }, { "key": "dc.subject", "value": "energetic particle distribution", "language": "en_US" }, { "key": "dc.subject", "value": "energetic particle transport", "language": "en_US" }, { "key": "dc.subject", "value": "kick model", "language": "en_US" }, { "key": "dc.subject", "value": "TRANSP", "language": "en_US" }, { "key": "dc.subject", "value": "NUBEAM", "language": "en_US" }, { "key": "dc.title", "value": "Phase space effects on fast ion distribution function modeling in tokamaks", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": "en_US" }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 81492, "name": "Mitigation of Alfven activity by 3D magnetic perturbations on NSTX", "handle": "88435/dsp01rx913s312", "type": "item", "link": "/rest/items/81492", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-08-10 09:04:47.382", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Kramer, G.J.", "language": null }, { "key": "dc.contributor.author", "value": "Kramer, G.J", "language": null }, { "key": "dc.contributor.author", "value": "Bortolon, A.", "language": null }, { "key": "dc.contributor.author", "value": "Ferraro, N.M.", "language": null }, { "key": "dc.contributor.author", "value": "Spong, D.A.", "language": null }, { "key": "dc.contributor.author", "value": "Crocker, N.A.", "language": null }, { "key": "dc.contributor.author", "value": "Darrow, D.S.", "language": null }, { "key": "dc.contributor.author", "value": "Fredrickson, E.D.", "language": null }, { "key": "dc.contributor.author", "value": "Kubota, S.", "language": null }, { "key": "dc.contributor.author", "value": "Park, J.-K.", "language": null }, { "key": "dc.contributor.author", "value": "Podesta, M.", "language": null }, { "key": "dc.contributor.author", "value": "Heidbrink, W.W.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-06-08T20:14:30Z", "language": null }, { "key": "dc.date.available", "value": "2016-06-08T20:14:30Z", "language": null }, { "key": "dc.date.issued", "value": "2016-08", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01rx913s312", "language": null }, { "key": "dc.description.abstract", "value": "Observations on the National Spherical Torus eXperiment (NSTX) indicate\r\nthat externally applied non-axisymmetric magnetic perturbations (MP) can\r\nreduce the amplitude of Toroidal Alfven Eigenmodes (TAE) and Global Alfven\r\nEigenmodes (GAE) in response to pulsed n=3 non-resonant fields. From\r\nfull-orbit following Monte Carlo simulations with the 1- and 2-fluid\r\nresistive MHD plasma response to the magnetic perturbation included,\r\nit was found that in response to MP pulses the fast-ion losses increased\r\nand the fast-ion drive for the GAEs was reduced. The MP did not affect\r\nthe fast-ion drive for the TAEs significantly but the Alfven continuum\r\nat the plasma edge was found to be altered due to the toroidal symmetry\r\nbreaking which leads to coupling of different toroidal harmonics. The\r\nTAE gap was reduced at the edge creating enhanced continuum damping of\r\nthe global TAEs, which is consistent with the observations. The results\r\nsuggest that optimized non-axisymmetric MP might be exploited to control\r\nand mitigate Alfven instabilities by tailoring the fast-ion distribution\r\nfunction and/or continuum structure.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Physics and Controlled Fusion, Vol. 58, p. 085003 (August 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "doi:10.1088/0741-3335/58/8/085003", "language": null }, { "key": "dc.subject", "value": "Wave-particle interaction", "language": "en_US" }, { "key": "dc.subject", "value": "Alfven eigenmodes", "language": "en_US" }, { "key": "dc.subject", "value": "fast ions", "language": "en_US" }, { "key": "dc.title", "value": "Mitigation of Alfven activity by 3D magnetic perturbations on NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 83733, "name": "Effect of progressively increasing lithium conditioning on edge transport and stability in high triangularity NSTX H-modes", "handle": "88435/dsp01h128nh17k", "type": "item", "link": "/rest/items/83733", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-09-01 01:23:36.039", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.contributor.author", "value": "Canik, J.M.", "language": null }, { "key": "dc.contributor.author", "value": "Bell, R.E.", "language": null }, { "key": "dc.contributor.author", "value": "Boyle, D.P.", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "Kaita, R.", "language": null }, { "key": "dc.contributor.author", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.author", "value": "LeBlanc, B.P.", "language": null }, { "key": "dc.contributor.author", "value": "Sabbagh, S.A.", "language": null }, { "key": "dc.contributor.author", "value": "Scotti, F.", "language": null }, { "key": "dc.contributor.author", "value": "Soukhanovskii, V.A.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-08-31T20:39:41Z", "language": null }, { "key": "dc.date.available", "value": "2016-08-31T20:39:41Z", "language": null }, { "key": "dc.date.issued", "value": "2016-08", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01h128nh17k", "language": null }, { "key": "dc.description.abstract", "value": "A sequence of H-mode discharges with increasing levels of pre-discharge lithium evaporation (\ufffddose\ufffd) was conducted in high triangularity and elongation boundary shape in NSTX. Energy confinement increased, and recycling decreased with increasing lithium dose, similar to a previous lithium dose scan in medium triangularity and elongation plasmas. Data-constrained SOLPS interpretive modeling quantified the edge transport change: the electron particle diffusivity decreased by 10-30x. The electron thermal diffusivity decreased by 4x just inside the top of the pedestal, but increased by up to 5x very near the separatrix. These results provide a baseline expectation for lithium benefits in NSTX-U, which is optimized for a boundary shape similar to the one in this experiment.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Fusion Engineering and Design", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.subject", "value": "Lithium", "language": "en_US" }, { "key": "dc.subject", "value": "Recycling", "language": "en_US" }, { "key": "dc.subject", "value": "Pedestal", "language": "en_US" }, { "key": "dc.subject", "value": "Energy confinement", "language": "en_US" }, { "key": "dc.title", "value": "Effect of progressively increasing lithium conditioning on edge transport and stability in high triangularity NSTX H-modes", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 89900, "name": "Electron-density-sensitive Line Ratios of Fe XIII--XVI from Laboratory Sources Compared to CHIANTI", "handle": "88435/dsp01tb09j833r", "type": "item", "link": "/rest/items/89900", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-02-24 04:06:26.694", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Weller, M.E.", "language": null }, { "key": "dc.contributor.author", "value": "Beiersdorfer, P.", "language": null }, { "key": "dc.contributor.author", "value": "Soukhanovskii, V.A.", "language": null }, { "key": "dc.contributor.author", "value": "Scotti, F.", "language": null }, { "key": "dc.contributor.author", "value": "LeBlanc, B.P.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-02-23T19:02:37Z", "language": null }, { "key": "dc.date.available", "value": "2018-02-23T19:02:37Z", "language": null }, { "key": "dc.date.issued", "value": "2018-02", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01tb09j833r", "language": null }, { "key": "dc.description.abstract", "value": "We present electron-density-sensitive line ratios for Fe XIII\u2013XVI measured in the spectral wavelength range of 200\u2013440 \u00c5 and an electron density range of (1\u20134)\u00d710^13 cm^\u22123. The results provide a test at the high-density limit of density-sensitive line ratios useful for astrophysical studies. The measurements were performed on the National Spherical Torus Experiment-Upgrade, where electron densities were measured independently by the laser Thomson scattering diagnostic. Spectra were collected with a flat-field grazing-incidence spectrometer, which provided a spectral resolution of up to 0.3 \u00c5, i.e., high resolution across the broad wavelength range. The response of the instrument was relatively calibrated using spectroscopic techniques in order to improve accuracy. The line ratios are compared to other laboratory sources and the latest version of CHIANTI (8.0.2), and an agreement within 30% is found.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "ApJ vol. 854 p. 102 (February 2018)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.3847/1538-4357/aaa5a1", "language": "en_US" }, { "key": "dc.subject", "value": "Atomic data", "language": "en_US" }, { "key": "dc.subject", "value": "Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "Stars: Flares", "language": "en_US" }, { "key": "dc.subject", "value": "Stars: Ultraviolet", "language": "en_US" }, { "key": "dc.subject", "value": "Sun: UV radiation", "language": "en_US" }, { "key": "dc.subject", "value": "Spectroscopic techniques", "language": "en_US" }, { "key": "dc.title", "value": "Electron-density-sensitive Line Ratios of Fe XIII--XVI from Laboratory Sources Compared to CHIANTI", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 103331, "name": "MHD-blob correlations in NSTX", "handle": "88435/dsp012v23vx30c", "type": "item", "link": "/rest/items/103331", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-07-08 13:00:06.776", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zweben SJ", "language": null }, { "key": "dc.contributor.author", "value": "Fredrickson ED", "language": null }, { "key": "dc.contributor.author", "value": "Myra JR", "language": null }, { "key": "dc.contributor.author", "value": "Podesta M", "language": null }, { "key": "dc.contributor.author", "value": "Scotti F", "language": null }, { "key": "dc.date.accessioned", "value": "2020-07-08T17:00:05Z", "language": null }, { "key": "dc.date.available", "value": "2020-07-08T17:00:05Z", "language": null }, { "key": "dc.date.issued", "value": "2020-05", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp012v23vx30c", "language": null }, { "key": "dc.description.abstract", "value": "This paper describes a study of the cross-correlations between edge fluctuations as seen in the gas puff imaging (GPI) diagnostic and low frequency coherent magnetic fluctuations (MHD) in H-mode plasmas in NSTX. The main new result was that large blobs in the SOL were significantly correlated with MHD activity the 3-6 kHz range in 21 of the 223 shots examined. There were also many other shots in which fluctuations in the GPI signal level and its peak radius Rpeak were correlated with MHD activity, but without any significant correlation of the MHD with large blobs. The structure and motion of the MHD is compared with that of the correlated blobs, and some possible theoretical mechanisms for the MHD-blob correlation are discussed.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "blobs", "language": "en_US" }, { "key": "dc.subject", "value": "MHD", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.title", "value": "MHD-blob correlations in NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 87627, "name": "Nonlinear simulations of beam-driven Compressional Alfv\u00e9n Eigenmodes in NSTX", "handle": "88435/dsp019593tx75w", "type": "item", "link": "/rest/items/87627", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-20 04:07:51.672", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Belova, E.V.", "language": null }, { "key": "dc.contributor.author", "value": "Gorelenkov, N.N.", "language": null }, { "key": "dc.contributor.author", "value": "Crocker, N.A.", "language": null }, { "key": "dc.contributor.author", "value": "Lestz, J.B.", "language": null }, { "key": "dc.contributor.author", "value": "Fredrickson, E.D.", "language": null }, { "key": "dc.contributor.author", "value": "Tang, S.", "language": null }, { "key": "dc.contributor.author", "value": "Tritz, K.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-07-19T17:03:37Z", "language": null }, { "key": "dc.date.available", "value": "2017-07-19T17:03:37Z", "language": null }, { "key": "dc.date.issued", "value": "2017-04", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp019593tx75w", "language": null }, { "key": "dc.description.abstract", "value": "Results of 3D nonlinear simulations of neutral-beam-driven compressional Alfven eigenmodes (CAEs) in the National Spherical Torus Experiment (NSTX) are presented. Hybrid MHD-particle simulations for the H-mode NSTX discharge (shot 141398) using the HYM code show unstable CAE modes for a range of toroidal mode numbers, n=4-9, and frequencies below the ion cyclotron frequency. It is found that the essential feature of CAEs is their coupling to kinetic Alfven wave (KAW) that occurs on the high-field side at the Alfven resonance location. High-frequency Alfven eigenmodes are frequently observed in beam-heated NSTX plasmas, and have been linked to flattening of the electron temperature profiles at high beam power. Coupling between CAE and KAW suggests an energy channeling mechanism to explain these observations, in which beam-driven CAEs dissipate their energy at the resonance location,\r\ntherefore significantly modifying the energy deposition profile. Nonlinear simulations demonstrate that CAEs can channel the energy of the beam ions from the injection region near the magnetic axis to the location of the resonant mode conversion at the edge of the beam density profile. A set of nonlinear simulations show that the CAE instability saturates due to nonlinear particle trapping, and a large fraction of beam energy can be transferred to several unstable CAEs of relatively large amplitudes and absorbed at the resonant location. Absorption rate shows a strong scaling with the beam power.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas vol. 24 p. 042505 (April 2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4979278", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.subject", "value": "Numerical simulations", "language": "en_US" }, { "key": "dc.subject", "value": "Compressional Alfven Eigenmodes", "language": "en_US" }, { "key": "dc.title", "value": "Nonlinear simulations of beam-driven Compressional Alfv\u00e9n Eigenmodes in NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 87164, "name": "Modeling of Lithium Granule Injection in NSTX with M3D-C1", "handle": "88435/dsp014j03d2280", "type": "item", "link": "/rest/items/87164", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-19 14:14:27.391", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Fil, A.", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, E.", "language": null }, { "key": "dc.contributor.author", "value": "Bortolon, A.", "language": null }, { "key": "dc.contributor.author", "value": "Ferraro, N.", "language": null }, { "key": "dc.contributor.author", "value": "Jardin, S.", "language": null }, { "key": "dc.contributor.author", "value": "Parks, P.B.", "language": null }, { "key": "dc.contributor.author", "value": "Lunsford, R.", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-07-19T18:14:27Z", "language": null }, { "key": "dc.date.available", "value": "2017-07-19T18:14:27Z", "language": null }, { "key": "dc.date.issued", "value": "2017-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp014j03d2280", "language": null }, { "key": "dc.description.abstract", "value": "In this paper we present initial simulations of pedestal control by Lithium Granule Injection (LGI) in NSTX. A model for small granule ablation has been implemented in the M3D-C1 code [1], allowing the simulation of realistic Lithium granule injections. 2D simulations in NSTX L-mode and H-mode plasmas are done and the effect of granule size, injection angle and velocity on the pedestal gradient increase are studied. For H-mode cases, the amplitude of the local pressure perturbation caused by the granules is highly dependent on the solid granule size. In our simulations, reducing the granule injection velocity allows one to inject more particles at the pedestal top.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1016/j.nme.2017.02.019", "language": "en_US" }, { "key": "dc.title", "value": "Modeling of Lithium Granule Injection in NSTX with M3D-C1", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 87754, "name": "Kinetic neoclassical calculations of impurity radiation profiles", "handle": "88435/dsp01rv042w69p", "type": "item", "link": "/rest/items/87754", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-21 04:06:52.394", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Stotler, D.P.", "language": null }, { "key": "dc.contributor.author", "value": "Battaglia, D.J.", "language": null }, { "key": "dc.contributor.author", "value": "Hager, R.", "language": null }, { "key": "dc.contributor.author", "value": "Kim, K.", "language": null }, { "key": "dc.contributor.author", "value": "Koskela, T.", "language": null }, { "key": "dc.contributor.author", "value": "Park, G.", "language": null }, { "key": "dc.contributor.author", "value": "Reinke, M.L.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-07-20T14:53:31Z", "language": null }, { "key": "dc.date.available", "value": "2017-07-20T14:53:31Z", "language": null }, { "key": "dc.date.issued", "value": "2017", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01rv042w69p", "language": null }, { "key": "dc.description.abstract", "value": "Modifications of the drift-kinetic transport code XGC0 to include the\r\ntransport, ionization, and recombination of individual charge states,\r\nas well as the associated radiation, are described. The code is first\r\napplied to a simulation of an NSTX H-mode discharge with carbon\r\nimpurity to demonstrate the approach to coronal equilibrium. The\r\neffects of neoclassical phenomena on the radiated power profile are\r\nexamined sequentially through the activation of individual physics\r\nmodules in the code. Orbit squeezing and the neoclassical inward\r\npinch result in increased radiation for temperatures above a few\r\nhundred eV and changes to the ratios of charge state emissions at a\r\ngiven electron temperature. Analogous simulations with a neon\r\nimpurity yield qualitatively similar results.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Published online in Nuclear Materials and Energy (2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1016/j.nme.2016.12.021", "language": "en_US" }, { "key": "dc.subject", "value": "Neoclassical transport", "language": "en_US" }, { "key": "dc.subject", "value": "Impurity radiation", "language": "en_US" }, { "key": "dc.subject", "value": "Coronal equilibrium", "language": "en_US" }, { "key": "dc.subject", "value": "Kinetic simulaition", "language": "en_US" }, { "key": "dc.subject", "value": "Particle-in-cell", "language": "en_US" }, { "key": "dc.subject", "value": "Spherical Torus", "language": "en_US" }, { "key": "dc.title", "value": "Kinetic neoclassical calculations of impurity radiation profiles", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 86110, "name": "Stabilizing effect of resistivity towards ELM-free H-mode discharge in lithium-conditioned NSTX", "handle": "88435/dsp010v838307q", "type": "item", "link": "/rest/items/86110", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-19 12:49:06.319", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Banerjee, D.", "language": null }, { "key": "dc.contributor.author", "value": "Zhu, P.", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-04-28T17:04:54Z", "language": null }, { "key": "dc.date.available", "value": "2017-04-28T17:04:54Z", "language": null }, { "key": "dc.date.issued", "value": "2017-07", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp010v838307q", "language": null }, { "key": "dc.description.abstract", "value": "Linear stability analysis of the national spherical torus experiment (NSTX) Li-conditioned\r\nELM-free H-mode equilibria is carried out in the context of the extended\r\nmagneto-hydrodynamic (MHD) model in NIMROD. The purpose is to investigate the physical\r\ncause behind edge localized mode (ELM) suppression in experiment after the Li-coating of\r\nthe divertor and the first wall of the NSTX tokamak. Besides ideal MHD modeling, including\r\nfinite-Larmor radius effect and two-fluid Hall and electron diamagnetic drift contributions,\r\na non-ideal resistivity model is employed, taking into account the increase of Z eff after\r\nLi-conditioning in ELM-free H-mode. Unlike an earlier conclusion from an eigenvalue code\r\nanalysis of these equilibria, NIMROD results find that after reduced recycling from divertor\r\nplates, profile modification is necessary but insufficient to explain the mechanism behind\r\ncomplete ELMs suppression in ideal two-fluid MHD. After considering the higher plasma\r\nresistivity due to higher Z eff , the complete stabilization could be explained. A thorough\r\nanalysis of both pre-lithium ELMy and with-lithium ELM-free cases using ideal and\r\nnon-ideal MHD models is presented, after accurately including a vacuum-like cold halo\r\nregion in NIMROD to investigate ELMs.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion vol. 57 p. 076005 (July 2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://doi.org/10.1066/1741-4326/aa6b25", "language": null }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.subject", "value": "Lithium", "language": "en_US" }, { "key": "dc.subject", "value": "Stability", "language": "en_US" }, { "key": "dc.subject", "value": "Edge physics", "language": "en_US" }, { "key": "dc.title", "value": "Stabilizing effect of resistivity towards ELM-free H-mode discharge in lithium-conditioned NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 101761, "name": "Machine Learning Characterization of Alfv\u00e9nic and Sub-Alfv\u00e9nic Chirping and Correlation With Fast-Ion Loss at NSTX", "handle": "88435/dsp01wh246w012", "type": "item", "link": "/rest/items/101761", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-12-27 11:38:25.523", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Woods, B. J. Q.", "language": null }, { "key": "dc.contributor.author", "value": "Duarte, V. N.", "language": null }, { "key": "dc.contributor.author", "value": "Fredrickson, E. D.", "language": null }, { "key": "dc.contributor.author", "value": "Gorelenkov, N. N.", "language": null }, { "key": "dc.contributor.author", "value": "Podest\u00e0, M.", "language": null }, { "key": "dc.contributor.author", "value": "Vann, R. G. L.", "language": null }, { "key": "dc.date.accessioned", "value": "2019-12-27T02:23:28Z", "language": null }, { "key": "dc.date.available", "value": "2019-12-27T02:23:28Z", "language": null }, { "key": "dc.date.issued", "value": "2019-12", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01wh246w012", "language": null }, { "key": "dc.description.abstract", "value": "Abrupt large events in the Alfvenic and sub-Alfvenic frequency bands in tokamaks are typically correlated with increased fast-ion loss. Here, machine learning is used to speed up the laborious process of characterizing the behavior of magnetic perturbations from corresponding frequency spectrograms that are typically identified by humans. The analysis allows for comparison between different mode character (such as quiescent, fixed frequency, and chirping, avalanching) and plasma parameters obtained from the TRANSP code, such as the ratio of the neutral beam injection (NBI) velocity and the Alfven velocity (v_inj./v_A), the q-profile, and the ratio of the neutral beam beta and the total plasma beta (beta_beam,i / beta). In agreement with the previous work by Fredrickson et al., we find a correlation between beta_beam,i and mode character. In addition, previously unknown correlations are found between moments of the spectrograms and mode character. Character transition from quiescent to nonquiescent behavior for magnetic fluctuations in the 50200-kHz frequency band is observed along the boundary v_phi ~ (1/4)(v_inj. - 3v_A), where v_phi is the rotation velocity.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "IEEE Transactions on Plasma Science", "language": "en_US" }, { "key": "dc.subject", "value": "machine learning", "language": "en_US" }, { "key": "dc.subject", "value": "tokamak physics", "language": "en_US" }, { "key": "dc.subject", "value": "plasma physics", "language": "en_US" }, { "key": "dc.title", "value": "Machine Learning Characterization of Alfv\u00e9nic and Sub-Alfv\u00e9nic Chirping and Correlation With Fast-Ion Loss at NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "Engineering and Physical Sciences Research Council (EPSRC) (please reference the grant EP/L01663X)", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 86187, "name": "The Role of Recti ed Currents in Far-Field RF Sheaths and in SOL Losses of HHFW Power on NSTX", "handle": "88435/dsp019306t1809", "type": "item", "link": "/rest/items/86187", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-05-10 01:09:01.739", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Perkins, R.J.", "language": null }, { "key": "dc.contributor.author", "value": "Hosea, J.C.", "language": null }, { "key": "dc.contributor.author", "value": "Jaworski, M.A.", "language": null }, { "key": "dc.contributor.author", "value": "Bell, R.E.", "language": null }, { "key": "dc.contributor.author", "value": "Bertelli, N.", "language": null }, { "key": "dc.contributor.author", "value": "Kramer, G.J.", "language": null }, { "key": "dc.contributor.author", "value": "Roquemore, L.", "language": null }, { "key": "dc.contributor.author", "value": "Taylor, G.", "language": null }, { "key": "dc.contributor.author", "value": "Wilson, J.R.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-05-09T16:57:22Z", "language": null }, { "key": "dc.date.available", "value": "2017-05-09T16:57:22Z", "language": null }, { "key": "dc.date.issued", "value": "2017-05", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp019306t1809", "language": null }, { "key": "dc.description.abstract", "value": "Radio-frequency (RF) rectification is an important sheath phenomenon for wave heating of plasma in fusion devices and is proposed to be the mechanism responsible for converting highharmonic fast-wave (HHFW) power in the National Spherical Torus eXperiment (NSTX) into a heat ux to the divertor. RF rectification has two aspects: current rectification and voltage recti- fication, and, while the latter is emphasized in many application, we demonstrate the importance of current rectification in analysis of the NSTX divertor during HHFW heating. When rectified currents are accounted for in first-principle models for the heat ux to the tiles, we predict a sizeable enhancement for the heat ux in the presence of an RF field: for one case studied, the predicted heat ux increases from 0:103 MW=m2 to 0:209 MW=m2. We also demonstrate how this rectification scales with injected HHFW power by tracking probe characteristics during a HHFW power ramp; the rectified current may be clamped at a certain level. This work is important for minimizing SOL losses of HHFW power in NSTX-U but may also have implications for near-field studies of ICRF antennae: ignoring rectified current may lead to underestimated heat uxes and overestimated rectified voltages.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Journal of Nuclear Material and Energy", "language": "en_US" }, { "key": "dc.subject", "value": "ICRF", "language": "en_US" }, { "key": "dc.subject", "value": "HHFW", "language": "en_US" }, { "key": "dc.subject", "value": "RF rectification", "language": "en_US" }, { "key": "dc.subject", "value": "Sheaths", "language": "en_US" }, { "key": "dc.subject", "value": "Divertor", "language": "en_US" }, { "key": "dc.title", "value": "The Role of Recti ed Currents in Far-Field RF Sheaths and in SOL Losses of HHFW Power on NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 89512, "name": "ELM-free and inter-ELM divertor heat flux broadening induced by Edge Harmonics Oscillation in NSTX", "handle": "88435/dsp01cz30pw31p", "type": "item", "link": "/rest/items/89512", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-01-09 17:13:13.949", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Gan, K.", "language": null }, { "key": "dc.contributor.author", "value": "Ahn, J.-W.", "language": null }, { "key": "dc.contributor.author", "value": "Gray, T.K.", "language": null }, { "key": "dc.contributor.author", "value": "Zweben, S.J.", "language": null }, { "key": "dc.contributor.author", "value": "Fredrickson, E.D.", "language": null }, { "key": "dc.contributor.author", "value": "Scotti, F.", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.contributor.author", "value": "Park, J.-K.", "language": null }, { "key": "dc.contributor.author", "value": "Canal, G.P.", "language": null }, { "key": "dc.contributor.author", "value": "Soukhanovskii, V.A.", "language": null }, { "key": "dc.contributor.author", "value": "McLean, A.G.", "language": null }, { "key": "dc.contributor.author", "value": "Wirth, B.D.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-01-09T22:13:13Z", "language": null }, { "key": "dc.date.available", "value": "2018-01-09T22:13:13Z", "language": null }, { "key": "dc.date.issued", "value": "2017-12", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01cz30pw31p", "language": null }, { "key": "dc.description.abstract", "value": "A new n=1 dominated Edge Harmonic Oscillation (EHO) has been found in NSTX. The new EHO, rotating toroidally in the counter-current direction and the opposite direction of the neutral beam, was observed during certain inter-ELM and ELM-free periods of H-mode operation. This EHO is associated with a significant broadening of the integral heat flux width (?_int) by up to 150%, and a decrease in the divertor peak heat flux by >60%. An EHO induced filament was also observed by the gas puff imaging diagnostic. The toroidal rotating filaments could change the edge magnetic topology resulting in toroidal rotating strike point splitting and heat flux broadening. Experimental result of the counter current rotation of strike points splitting is consistent with the counter-current EHO.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion (December 2017)", "language": "en_US" }, { "key": "dc.subject", "value": "Edge harmonic oscillation", "language": "en_US" }, { "key": "dc.subject", "value": "Divertor heat flux width", "language": "en_US" }, { "key": "dc.title", "value": "ELM-free and inter-ELM divertor heat flux broadening induced by Edge Harmonics Oscillation in NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 88987, "name": "Density perturbation mode structure of high frequency compressional and global Alfv\u00e9n eigenmodes in the National Spherical Torus Experiment using a novel reflectometer analysis technique", "handle": "88435/dsp01hx11xh896", "type": "item", "link": "/rest/items/88987", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-11-03 04:06:22.378", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Crocker, N.A.", "language": null }, { "key": "dc.contributor.author", "value": "Kubota, S.", "language": null }, { "key": "dc.contributor.author", "value": "Peebles, W.A.", "language": null }, { "key": "dc.contributor.author", "value": "Rhodes, T.L.", "language": null }, { "key": "dc.contributor.author", "value": "Fredrickson, E.D.", "language": null }, { "key": "dc.contributor.author", "value": "Belova, E.", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "LeBlanc, B.P.", "language": null }, { "key": "dc.contributor.author", "value": "Sabbagh, S.A.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-11-02T19:53:08Z", "language": null }, { "key": "dc.date.available", "value": "2017-11-02T19:53:08Z", "language": null }, { "key": "dc.date.issued", "value": "2017-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01hx11xh896", "language": null }, { "key": "dc.description.abstract", "value": "Reflectometry measurements of compressional (CAE) and global (GAE) Alfv\u00e9n eigenmodes are analyzed to obtain the amplitude and spatial structure of the density perturbations associated with the modes. A novel analysis technique developed for this purpose is presented. The analysis also naturally yields the amplitude and spatial structure of the density contour radial displacement, which is found to be 2\u20134 times larger than the value estimated directly from the reflectometer measurements using the much simpler \u2018mirror approximation\u2019. The modes were driven by beam ions in a high power (6 MW) neutral beam heated H-mode discharge (#141398) in the National Spherical Torus Experiment. The results of the analysis are used to assess the contribution of the modes to core energy transport and ion heating. The total displacement amplitude of the modes, which is shown to be larger than previously estimated (Crocker et al 2013 Nucl. Fusion 53 43017), is compared to the predicted threshold (Gorelenkov et al 2010 Nucl. Fusion 50 84012) for the anomalously high heat diffusion inferred from transport modeling in similar NSTX discharges. The results of the analysis also have strong implications for the energy transport via coupling of CAEs to kinetic Alfv\u00e9n waves seen in simulations with the Hybrid MHD code (Belova et al 2015 Phys. Rev. Lett. 115 15001). Finally, the amplitudes of the observed CAEs fall well below the threshold for causing significant ion heating by stochastic velocity space diffusion (Gates et al 2001 Phys. Rev. Lett. 87 205003).", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion (November 2017)", "language": "en_US" }, { "key": "dc.subject", "value": "Alfven Eigenmodes", "language": "en_US" }, { "key": "dc.subject", "value": "Energetic ions", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma heating", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma transport", "language": "en_US" }, { "key": "dc.subject", "value": "Wave-particle interactions", "language": "en_US" }, { "key": "dc.subject", "value": "Reflectometry", "language": "en_US" }, { "key": "dc.title", "value": "Density perturbation mode structure of high frequency compressional and global Alfv\u00e9n eigenmodes in the National Spherical Torus Experiment using a novel reflectometer analysis technique", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466, DE-SC0011810 and DE-FG02-99ER54527", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 108958, "name": "Microtearing Instabilities and Electron Thermal Transport in Low and High Collisionality NSTX Discharges", "handle": "88435/dsp011j92gb54m", "type": "item", "link": "/rest/items/108958", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-02 12:31:43.804", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Rafiq T", "language": null }, { "key": "dc.contributor.author", "value": "Kaye S", "language": null }, { "key": "dc.contributor.author", "value": "Guttenfelder W", "language": null }, { "key": "dc.contributor.author", "value": "Weiland J", "language": null }, { "key": "dc.contributor.author", "value": "Schuster E", "language": null }, { "key": "dc.contributor.author", "value": "Anderson J", "language": null }, { "key": "dc.contributor.author", "value": "Luo L;", "language": null }, { "key": "dc.date.accessioned", "value": "2021-02-19T20:54:31Z", "language": null }, { "key": "dc.date.available", "value": "2021-02-19T20:54:31Z", "language": null }, { "key": "dc.date.issued", "value": "2021-02", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp011j92gb54m", "language": null }, { "key": "dc.description.abstract", "value": "Microtearing mode (MTM) real frequency, growth rate, magnetic fluctuation amplitude and resulting electron thermal transport are studied in systematic NSTX scans of relevant plasma parameters. The dependency of the MTM real frequency and growth rate on plasma parameters, suitable for low and high collision NSTX discharges, is obtained by using the reduced MTM transport model [T. Rafiq, et al., Phys. Plasmas 23, 062507 (2016)]. The plasma parameter dependencies are compared and found to be consistent with the results obtained from MTM using the Gyrokinetic GYRO code. The scaling trend of collision frequency and plasma beta is found to be consistent with the global energy confinement trend observed in the NSTX experiment. The strength of the magnetic fluctuation is found to be consistent with the gyrokinetic estimate.In earlier studies, it was found that the version of the Multi-Mode (MM) anomalous transport model, which did not contain the effect of MTMs, provided an appropriate description of the electron temperature profiles in standard tokamak discharges and not in spherical tokamaks. When the MM model, which involves transport associated with MTMs, is incorporated in the TRANSP code and is used in the study of electron thermal transport in NSTX discharges, it is observed that the agreement with the experimental electron temperature profile is substantially improved.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "magnetic confinement", "language": "en_US" }, { "key": "dc.subject", "value": "microtearing", "language": "en_US" }, { "key": "dc.subject", "value": "instabilities", "language": "en_US" }, { "key": "dc.subject", "value": "tokamaks", "language": "en_US" }, { "key": "dc.subject", "value": "turbulence and transport", "language": "en_US" }, { "key": "dc.subject", "value": "fusion plasma technology", "language": "en_US" }, { "key": "dc.title", "value": "Microtearing Instabilities and Electron Thermal Transport in Low and High Collisionality NSTX Discharges", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 130497, "name": "Impact of edge harmonic oscillations on the divertor heat flux in NSTX", "handle": "88435/dsp019c67wq96p", "type": "item", "link": "/rest/items/130497", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 11:05:20.098", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Gan, Kaifu", "language": null }, { "key": "dc.contributor.author", "value": "Gan, Kaifu", "language": null }, { "key": "dc.contributor.author", "value": "Gray, Travis", "language": null }, { "key": "dc.contributor.author", "value": "Zweben, Stewart", "language": null }, { "key": "dc.contributor.author", "value": "Eric, Fredrickson", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, Rajesh", "language": null }, { "key": "dc.contributor.author", "value": "Battaglia, Devon", "language": null }, { "key": "dc.contributor.author", "value": "McLean, Adam", "language": null }, { "key": "dc.contributor.author", "value": "Wirth, Brian", "language": null }, { "key": "dc.date.accessioned", "value": "2021-12-07T14:27:43Z", "language": null }, { "key": "dc.date.available", "value": "2021-12-07T14:27:43Z", "language": null }, { "key": "dc.date.issued", "value": "2021-12-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp019c67wq96p", "language": null }, { "key": "dc.description.abstract", "value": "All the data was uploaded with .cvs file, we have not uploaded the figure 1 data since it is just photo show field of view of IR and GPI diagnostic.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "The data is .cvs file, people can use IDL, Matlab, Python to read these data", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0069701", "language": "en_US" }, { "key": "dc.source", "value": "NSTX data", "language": "en_US" }, { "key": "dc.subject", "value": "edge harmonic oscillation", "language": "en_US" }, { "key": "dc.subject", "value": "heat flux width", "language": "en_US" }, { "key": "dc.title", "value": "Impact of edge harmonic oscillations on the divertor heat flux in NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "gan, kaifu", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-SC0016915", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 133856, "name": "Correlation between the relative blob fraction and plasma parameters in NSTX", "handle": "88435/dsp01qb98mj62b", "type": "item", "link": "/rest/items/133856", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-02-16 13:32:13.252", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Zweben, S.J.", "language": null }, { "key": "dc.contributor.author", "value": "Zweben, S,J.", "language": null }, { "key": "dc.contributor.author", "value": "Banerjee, S", "language": null }, { "key": "dc.contributor.author", "value": "Bisai, N", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A", "language": null }, { "key": "dc.contributor.author", "value": "Lampert, M", "language": null }, { "key": "dc.contributor.author", "value": "LeBlanc, B", "language": null }, { "key": "dc.contributor.author", "value": "Myra, JR", "language": null }, { "key": "dc.contributor.author", "value": "Russell, D.A.", "language": null }, { "key": "dc.date.accessioned", "value": "2022-01-19T16:57:31Z", "language": null }, { "key": "dc.date.available", "value": "2022-01-19T16:57:31Z", "language": null }, { "key": "dc.date.issued", "value": "2022-01-18", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01qb98mj62b", "language": null }, { "key": "dc.description.abstract", "value": "data of figures used in this publication", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Phys. Plasmas 29, 012505 (2022)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0074261", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX, blob, turbulence", "language": "en_US" }, { "key": "dc.title", "value": "Correlation between the relative blob fraction and plasma parameters in NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Zweben, Stewart", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 148076, "name": "Temporal Structure of Blobs in NSTX", "handle": "88435/dsp01zp38wg800", "type": "item", "link": "/rest/items/148076", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 11:09:08.209", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Myra, James", "language": null }, { "key": "dc.contributor.author", "value": "Lampert, Mate", "language": null }, { "key": "dc.date.accessioned", "value": "2022-07-25T12:20:01Z", "language": null }, { "key": "dc.date.available", "value": "2022-07-25T12:20:01Z", "language": null }, { "key": "dc.date.issued", "value": "2022-07-21", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01zp38wg800", "language": null }, { "key": "dc.description.tableofcontents", "value": "see Readme", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas 29, 072504 (2022)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0097282", "language": "en_US" }, { "key": "dc.subject", "value": "tokamak, edge, turbulence", "language": "en_US" }, { "key": "dc.title", "value": "Temporal Structure of Blobs in NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "zweben, Stewart", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 151829, "name": "Electron Temperature Gradient Driven Transport Model for Tokamak Plasmas", "handle": "88435/dsp015d86p342b", "type": "item", "link": "/rest/items/151829", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 11:28:34.765", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Wilson, Christopher", "language": null }, { "key": "dc.contributor.author", "value": "Rafiq, Tariq", "language": null }, { "key": "dc.contributor.author", "value": "Wilson, Christopher", "language": null }, { "key": "dc.contributor.author", "value": "Luo, Lixiang", "language": null }, { "key": "dc.contributor.author", "value": "Weiland, Jan", "language": null }, { "key": "dc.contributor.author", "value": "Schuster, Eugenio", "language": null }, { "key": "dc.contributor.author", "value": "Pankin, Alexei", "language": null }, { "key": "dc.contributor.author", "value": "Guttenfelder, Walter", "language": null }, { "key": "dc.contributor.author", "value": "Kaye, Stan", "language": null }, { "key": "dc.date.accessioned", "value": "2022-09-02T16:32:06Z", "language": null }, { "key": "dc.date.available", "value": "2022-09-02T16:32:06Z", "language": null }, { "key": "dc.date.issued", "value": "2022-08-30", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp015d86p342b", "language": null }, { "key": "dc.description.abstract", "value": "A new model for electron temperature gradient (ETG) modes is developed as a component of the Multi-Mode anomalous transport module [T. Rafiq \\textit{et al.,} Phys Plasmas \\textbf{20}, 032506 (2013)] to predict a time dependent electron temperature profile in conventional and low aspect ratio tokamaks. This model is based on two-fluid equations that govern the dynamics of low-frequency short- and long-wavelength electromagnetic toroidal ETG driven drift modes. A low collisionality NSTX discharge is used to scan the plasma parameter dependence on the ETG real frequency, growth rate, and electron thermal diffusivity. Electron thermal transport is discovered in the deep core region where modes are more electromagnetic in nature. Several previously reported gyrokinetic trends are reproduced, including the dependencies of density gradients, magnetic shear, $\\beta$ and gradient of $\\beta$ $(\\betap)$, collisionality, safety factor, and toroidicity, where $\\beta$ is the ratio of plasma pressure to the magnetic pressure. The electron heat diffusivity associated with the ETG mode is discovered to be on a scale consistent with the experimental diffusivity determined by power balance analysis.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Phys plasmas", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0104672", "language": "en_US" }, { "key": "dc.subject", "value": "ETG", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.subject", "value": "Turbulence and transport", "language": "en_US" }, { "key": "dc.subject", "value": "instabilities", "language": "en_US" }, { "key": "dc.title", "value": "Electron Temperature Gradient Driven Transport Model for Tokamak Plasmas", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Rafiq, Tariq", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number US DOE DE-SC0021385 and DE-SC0013977", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 151788, "name": "Internal Rotation of ELM Filaments on NSTX", "handle": "88435/dsp011n79h751f", "type": "item", "link": "/rest/items/151788", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-31 14:10:41.168", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Lampert, Mate", "language": null }, { "key": "dc.contributor.author", "value": "Lampert, Mate", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, Ahmed", "language": null }, { "key": "dc.contributor.author", "value": "Zweben, Stewart", "language": null }, { "key": "dc.contributor.author", "value": "Myra, Jim", "language": null }, { "key": "dc.date.accessioned", "value": "2022-09-05T14:03:25Z", "language": null }, { "key": "dc.date.available", "value": "2022-09-05T14:03:25Z", "language": null }, { "key": "dc.date.issued", "value": "2022-09", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp011n79h751f", "language": null }, { "key": "dc.description.abstract", "value": "The data is formatted to text files. A corresponding file is provided for each figure.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Dataset for the Physics of Plasmas paper titled \"Internal Rotation of ELM Filaments on NSTX\"", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0100807", "language": null }, { "key": "dc.source", "value": "GPI data analysis", "language": "en_US" }, { "key": "dc.title", "value": "Internal Rotation of ELM Filaments on NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Lampert, Mate", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 152336, "name": "Linear ion-scale micro-stability analysis of high and low-collisionality NSTX discharges and NSTX-U projections", "handle": "88435/dsp01ng451m72r", "type": "item", "link": "/rest/items/152336", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-31 14:08:07.796", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Clauser, Cesar", "language": null }, { "key": "dc.contributor.author", "value": "Guttenfelder, Walter", "language": null }, { "key": "dc.contributor.author", "value": "Rafiq, Tariq", "language": null }, { "key": "dc.contributor.author", "value": "Schuster, Eugenio", "language": null }, { "key": "dc.date.accessioned", "value": "2022-09-07T13:47:01Z", "language": null }, { "key": "dc.date.available", "value": "2022-09-07T13:47:01Z", "language": null }, { "key": "dc.date.issued", "value": "2022-09-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01ng451m72r", "language": null }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0102169", "language": null }, { "key": "dc.title", "value": "Linear ion-scale micro-stability analysis of high and low-collisionality NSTX discharges and NSTX-U projections", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Clauser, Cesar", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-SC0021385", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-SC0013977", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 136583, "name": "Global gyrokinetic study of shaping effects on electromagnetic modes at NSTX aspect ratio with ad hoc parallel magnetic perturbation effects", "handle": "88435/dsp015x21tj58z", "type": "item", "link": "/rest/items/136583", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-31 14:22:21.181", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Sharma, A. Y.", "language": null }, { "key": "dc.contributor.author", "value": "Cole, M. D. J.", "language": null }, { "key": "dc.contributor.author", "value": "G\u00f6rler, T.", "language": null }, { "key": "dc.contributor.author", "value": "Chen, Y.", "language": null }, { "key": "dc.contributor.author", "value": "Hatch, D. R.", "language": null }, { "key": "dc.contributor.author", "value": "Guttenfelder, W.", "language": null }, { "key": "dc.contributor.author", "value": "Hager, R.", "language": null }, { "key": "dc.contributor.author", "value": "Sturdevant, B. J.", "language": null }, { "key": "dc.contributor.author", "value": "Ku, S.", "language": null }, { "key": "dc.contributor.author", "value": "Chang, C. S.", "language": null }, { "key": "dc.date.accessioned", "value": "2022-06-15T18:17:38Z", "language": null }, { "key": "dc.date.available", "value": "2022-06-15T18:17:38Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp015x21tj58z", "language": null }, { "key": "dc.description.abstract", "value": "Plasma shaping may have a stronger effect on global turbulence in tight-aspect-ratio tokamaks than in conventional-aspect-ratio tokamaks due to the higher toroidicity and more acute poloidal asymmetry in the magnetic field. In addition, previous local gyrokinetic studies have shown that it is necessary to include parallel magnetic field perturbations in order to accurately compute growth rates of electromagnetic modes in tight-aspect-ratio tokamaks. In this work, the effects of elongation and triangularity on global, ion-scale, linear electromagnetic modes are studied at NSTX aspect ratio and high plasma beta using the global gyrokinetic particle-in-cell code XGC. The effects of compressional magnetic perturbations are approximated via a well-known modification to the particle drifts that was developed for flux-tube simulations [N. Joiner et al., Phys. Plasmas 17, 072104 (2010)], without proof of its validity in a global simulation. Magnetic equilibria are re-constructed for each distinct plasma profile that is used. Coulomb collision effects are not considered. Within the limitations imposed by the present study, it is found that linear growth rates of electromagnetic modes (collisionless microtearing modes and kinetic ballooning modes) are significantly reduced by NSTX-like shaping. For example, growth rates of kinetic ballooning modes at high beta are reduced to the level of that of collisionless trapped electron modes.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0106925", "language": null }, { "key": "dc.title", "value": "Global gyrokinetic study of shaping effects on electromagnetic modes at NSTX aspect ratio with ad hoc parallel magnetic perturbation effects", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.depositor", "value": "Sharma, Amil", "language": null } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 160144, "name": "Novel angular velocity estimation technique for plasma filaments", "handle": "88435/dsp011g05ff83b", "type": "item", "link": "/rest/items/160144", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-31 14:00:21.102", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Mate, Lampert", "language": null }, { "key": "dc.contributor.author", "value": "Mate, Lampert", "language": null }, { "key": "dc.contributor.author", "value": "Ahmed, Diallo", "language": null }, { "key": "dc.contributor.author", "value": "Stewart, Zweben", "language": null }, { "key": "dc.date.accessioned", "value": "2022-12-20T14:19:39Z", "language": null }, { "key": "dc.date.available", "value": "2022-12-20T14:19:39Z", "language": null }, { "key": "dc.date.issued", "value": "2022-12", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp011g05ff83b", "language": null }, { "key": "dc.description.abstract", "value": "Data for the figures in text format. Please read the README file for detailed description.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "The data are a result of the calculations presented in the Review of Scientific Instruments publication titled \"Novel angular velocity estimation technique for plasma filaments\". The files are described in detail in README.txt", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0128818", "language": null }, { "key": "dc.source", "value": "NSTX GPI data", "language": "en_US" }, { "key": "dc.title", "value": "Novel angular velocity estimation technique for plasma filaments", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Mate, Lampert", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 168587, "name": "Thermal ion kinetic effects and Landau damping in fishbone modes", "handle": "88435/dsp018s45qd02d", "type": "item", "link": "/rest/items/168587", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-04-10 13:11:45.801", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Liu, Chang", "language": null }, { "key": "dc.contributor.author", "value": "Liu, Chang", "language": null }, { "key": "dc.contributor.author", "value": "Jardin, Stephen", "language": null }, { "key": "dc.contributor.author", "value": "Bao, Jian", "language": null }, { "key": "dc.contributor.author", "value": "Gorelenkov, Nikolai", "language": null }, { "key": "dc.contributor.author", "value": "Brennan, Dylan", "language": null }, { "key": "dc.contributor.author", "value": "Yang, James", "language": null }, { "key": "dc.date.accessioned", "value": "2023-04-10T17:11:44Z", "language": null }, { "key": "dc.date.available", "value": "2023-04-10T17:11:44Z", "language": null }, { "key": "dc.date.issued", "value": "2022-11-22", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp018s45qd02d", "language": null }, { "key": "dc.description.abstract", "value": "The data set consists of the figures in a manuscript titled Thermal ion kinetic effects and Landau damping in fishbone modes, and plotting script used for figure generation. There are 16 figures with captions.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "The Readme.txt file contains descriptions of data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Journal of Plasma Physics 88(6), 905880610 (2022).", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1017/S0022377822000952", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Spherical Tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Thermal ion kinetic effect", "language": "en_US" }, { "key": "dc.subject", "value": "Fishbone mode", "language": "en_US" }, { "key": "dc.subject", "value": "Landau damping", "language": "en_US" }, { "key": "dc.subject", "value": "Kinetic-MHD simulatoin", "language": "en_US" }, { "key": "dc.title", "value": "Thermal ion kinetic effects and Landau damping in fishbone modes", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Liu, Chang", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 88687, "name": "Drift kinetic effects on the plasma response in high beta spherical tokamak experiments", "handle": "88435/dsp01tb09j831f", "type": "item", "link": "/rest/items/88687", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-09-25 08:38:29.58", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Wang, Z.R.", "language": null }, { "key": "dc.contributor.author", "value": "Park, J.-K.", "language": null }, { "key": "dc.contributor.author", "value": "Menard, J.E.", "language": null }, { "key": "dc.contributor.author", "value": "Liu, Y.Q.", "language": null }, { "key": "dc.contributor.author", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.author", "value": "Gerhardt, S.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-09-25T12:38:29Z", "language": null }, { "key": "dc.date.available", "value": "2017-09-25T12:38:29Z", "language": null }, { "key": "dc.date.issued", "value": "2017-09", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01tb09j831f", "language": null }, { "key": "dc.description.abstract", "value": "High $\\beta$ plasma response to the rotating n=1 external magnetic perturbations is numerically studied and compared with National Spherical Torus eXperiment (NSTX). The hybrid magnetohydrodynamic(MHD)-kinetic modeling shows the drift kinetic effects are important to resolve the disagreement of plasma response between the ideal MHD prediction and the NSTX experimental observation when plasma pressure reaches and exceeds the no-wall limit [F. Troyon et al., Plasma Phys. Control. Fusion \\textbf{26}, 209 (1984)]. Since the external rotating fields and high plasma rotation are presented in NSTX experiments, the importance of resistive wall effect and plasma rotation on determining the plasma response is also identified, where the resistive wall suppresses the plasma response through the wall eddy current. The inertial energy, due to plasma rotation, destabilizes the plasma. The complexity of plasma response, in this study, indicates that MHD modeling, including comprehensive physics e.g. the drift kinetic effects, resistive wall and plasma rotation, is essential to reliably predict the plasma behavior in high beta spherical tokamak device.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion (September 2017)", "language": "en_US" }, { "key": "dc.subject", "value": "Kinetic plasma response", "language": "en_US" }, { "key": "dc.subject", "value": "MHD", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamak", "language": "en_US" }, { "key": "dc.title", "value": "Drift kinetic effects on the plasma response in high beta spherical tokamak experiments", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 88689, "name": "Application of Townsend avalanche theory to tokamak startup by coaxial helicity injection", "handle": "88435/dsp01mk61rk59x", "type": "item", "link": "/rest/items/88689", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-09-26 04:06:32.962", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Hammond, K.C.", "language": null }, { "key": "dc.contributor.author", "value": "Raman, R.", "language": null }, { "key": "dc.contributor.author", "value": "Volpe, F.A.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-09-25T19:16:25Z", "language": null }, { "key": "dc.date.available", "value": "2017-09-25T19:16:25Z", "language": null }, { "key": "dc.date.issued", "value": "2017-09", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01mk61rk59x", "language": null }, { "key": "dc.description.abstract", "value": "Townsend avalanche theory is employed to model and interpret plasma initiation \r\nin NSTX by Ohmic heating and coaxial helicity injection (CHI). The model is \r\ninformed by spatially resolved vacuum calculations of electric field and \r\nmagnetic field line connection length in the poloidal cross-section. The model\r\nis shown to explain observations of Ohmic startup including the duration and\r\nlocation of breakdown. Adapting the model to discharges initiated by CHI offers \r\ninsight into the causes of upper divertor (absorber) arcs in cases where the \r\ndischarge fails to initiate in the lower divertor gap. Finally, upper and lower \r\nlimits are established for vessel gas fill based on requirements for breakdown \r\nand radiation. It is predicted that CHI experiments on NSTX-U should be\r\nable to use as much as four times the amount of prefill gas employed in CHI \r\nexperiments in NSTX. This should provide greater flexibility for plasma \r\nstart-up, as the injector flux is projected to be increased in NSTX-U.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion (September 2017)", "language": "en_US" }, { "key": "dc.subject", "value": "Coaxial helicity injection", "language": "en_US" }, { "key": "dc.subject", "value": "CHI", "language": "en_US" }, { "key": "dc.subject", "value": "Townsend", "language": "en_US" }, { "key": "dc.subject", "value": "Avalanche", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.title", "value": "Application of Townsend avalanche theory to tokamak startup by coaxial helicity injection", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 88692, "name": "A Riccati Solution for the Ideal MHD Plasma Response with Applications to Real-time Stability Control", "handle": "88435/dsp01gx41mm508", "type": "item", "link": "/rest/items/88692", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-05-07 09:39:05.426", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Glasser, A.", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, E.", "language": null }, { "key": "dc.contributor.author", "value": "Glasser, A.H.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-09-26T15:59:43Z", "language": null }, { "key": "dc.date.available", "value": "2017-09-26T15:59:43Z", "language": null }, { "key": "dc.date.issued", "value": "2018-03", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01gx41mm508", "language": null }, { "key": "dc.description.abstract", "value": "To effectuate near real-time feedback control of ideal MHD instabilities in a tokamak geometry, a rapid solution for stability analysis is a prerequisite. Toward this end, we reformulate the \u03b4W stability method with a Hamilton-Jacobi theory, elucidating analytical and numerical features of the generic tokamak ideal MHD stability problem. The plasma response matrix is demonstrated to be the solution of an ideal MHD matrix Riccati differential equation (MRDE). Since Riccati equations are prevalent in the control theory literature, such a shift in perspective brings to bear a range of numerical methods that are well-suited to the robust, fast solution of control problems. We discuss the usefulness of Riccati techniques in solving the stiff ODEs often encountered in ideal MHD stability analyses-\u2014for example, in tokamak edge and stellarator physics. We then demonstrate the applicability of such methods to an existing 2D ideal MHD stability code\u2014DCON\u2014enabling its parallel operation in near real-time. Output is shown to match with high accuracy, and with wall-clock time \u226a 1s. Such speed may help enable active feedback ideal MHD stability control, especially in tokamak plasmas whose ideal MHD equilibria evolve with inductive timescale \u03c4 > 1s-\u2014as in ITER.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas vol. 25 p. 032507 (March 2018)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://aip.scitation.org/doi/10.1063/1.5007042", "language": null }, { "key": "dc.subject", "value": "Plasma response", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma response matrix", "language": "en_US" }, { "key": "dc.subject", "value": "Stability", "language": "en_US" }, { "key": "dc.subject", "value": "Control", "language": "en_US" }, { "key": "dc.subject", "value": "Riccati equation", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Ideal MHD", "language": "en_US" }, { "key": "dc.subject", "value": "DCON", "language": "en_US" }, { "key": "dc.subject", "value": "Real-time", "language": "en_US" }, { "key": "dc.subject", "value": "Parallel", "language": "en_US" }, { "key": "dc.title", "value": "A Riccati Solution for the Ideal MHD Plasma Response with Applications to Real-time Stability Control", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 81944, "name": "Resonance in Fast-Wave Amplitude in the Periphery of Cylindrical Plasmas and Application to Edge Losses of Wave Heating Power in Tokamaks", "handle": "88435/dsp013t945t20t", "type": "item", "link": "/rest/items/81944", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-11-14 11:59:04.976", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Perkins, R.J.", "language": null }, { "key": "dc.contributor.author", "value": "Hosea, J.C.", "language": null }, { "key": "dc.contributor.author", "value": "Bertelli, N.", "language": null }, { "key": "dc.contributor.author", "value": "Taylor, G.", "language": null }, { "key": "dc.contributor.author", "value": "Wilson, J.R.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-06-17T19:01:51Z", "language": null }, { "key": "dc.date.available", "value": "2016-06-17T19:01:51Z", "language": null }, { "key": "dc.date.issued", "value": "2016-07", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp013t945t20t", "language": null }, { "key": "dc.description.abstract", "value": "Heating magnetically confined plasmas using waves in the ion-cyclotron range of frequencies typically requires coupling these waves over a steep density gradient. This process has produced an unexpected and deleterious phenomenon on the National Spherical Torus eXperiment (NSTX): a prompt loss of wave power along magnetic field lines in front of the antenna to the divertor. Understanding this loss may be key to achieving effective heating and expanding the operational space of NSTX-Upgrade. Here, we propose that a new type of mode, which conducts a significant fraction of the total wave power in the low-density peripheral plasma, is driving these losses. We demonstrate the existence of such modes, which are distinct from surface modes and coaxial modes, in a cylindrical cold-plasma model when a half wavelength structure fits into the region outside the core plasma. The latter condition generalizes the previous hypothesis regarding the occurence of the edge losses and may explain why full-wave simulations predict these losses in some cases but not others. If valid, this condition implies that outer gap control is a potential strategy for mitigating the losses in NSTX-Upgrade in addition to raising the magnetic field or influencing the edge density.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas, vol. 23, p. 070702 (July 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4954899", "language": null }, { "key": "dc.subject", "value": "Magnetically confined fusion", "language": "en_US" }, { "key": "dc.subject", "value": "Wave heating", "language": "en_US" }, { "key": "dc.subject", "value": "Cold plasma waves", "language": "en_US" }, { "key": "dc.title", "value": "Resonance in Fast-Wave Amplitude in the Periphery of Cylindrical Plasmas and Application to Edge Losses of Wave Heating Power in Tokamaks", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 93089, "name": "Elemental and topographical imaging of microscopic variations in deposition on NSTX-U and DIII-D samples", "handle": "88435/dsp01bn999950b", "type": "item", "link": "/rest/items/93089", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-10-04 04:18:56.956", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Skinner, C.H.", "language": null }, { "key": "dc.contributor.author", "value": "Chrobak, C.P.", "language": null }, { "key": "dc.contributor.author", "value": "Kaita, R.", "language": null }, { "key": "dc.contributor.author", "value": "Koel, B.E.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-10-03T13:58:45Z", "language": null }, { "key": "dc.date.available", "value": "2018-10-03T13:58:45Z", "language": null }, { "key": "dc.date.issued", "value": "2018-10", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01bn999950b", "language": null }, { "key": "dc.description.abstract", "value": "Tokamak plasma facing components have surface roughness that can cause microscopic spatial variations in erosion and deposition and hence influence material migration, erosion lifetime, dust and tritium accumulation, and plasma contamination. However high spatial resolution measurements of deposition on the scale of the surface roughness have been lacking to date. We will present elemental images of graphite samples from NSTX-U and DIII-D DiMES experiments performed with a Scanning Auger Microprobe at sub-micron resolution that show strong microscopic variations in deposition and correlate this with 3D topographical maps of surface irregularities. The NSTX-U samples were boronized and exposed to deuterium plasmas and the DiMES samples had localized Al and W films and were exposed to dedicated helium plasmas. Topographical maps of the samples were performed with a 3D confocal optical microscope and compared to the elemental deposition pattern. The results revealed localized deposition concentrated in areas shadowed from the ion flux, incident in a direction calculated (for the DiMES case) by taking account of the magnetic pre-sheath.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nucl. Mat. and Energy", "language": "en_US" }, { "key": "dc.subject", "value": "Erosion", "language": "en_US" }, { "key": "dc.subject", "value": "Deposition", "language": "en_US" }, { "key": "dc.subject", "value": "DIMES", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma-materials interaction", "language": "en_US" }, { "key": "dc.subject", "value": "Surface analysis", "language": "en_US" }, { "key": "dc.title", "value": "Elemental and topographical imaging of microscopic variations in deposition on NSTX-U and DIII-D samples", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 85787, "name": "Multi-species impurity granule injection and mass deposition projections in NSTX-U discharges Authors", "handle": "88435/dsp012j62s7356", "type": "item", "link": "/rest/items/85787", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-19 12:17:10.164", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Lunsford, R.", "language": null }, { "key": "dc.contributor.author", "value": "Bortolon, A.", "language": null }, { "key": "dc.contributor.author", "value": "Roquemore, A.L.", "language": null }, { "key": "dc.contributor.author", "value": "Mansfield, D.K.", "language": null }, { "key": "dc.contributor.author", "value": "Jaworski, M.A.", "language": null }, { "key": "dc.contributor.author", "value": "Kaita, R.", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.contributor.author", "value": "Nagy, A.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-04-03T18:23:37Z", "language": null }, { "key": "dc.date.available", "value": "2017-04-03T18:23:37Z", "language": null }, { "key": "dc.date.issued", "value": "2017-07", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp012j62s7356", "language": null }, { "key": "dc.description.abstract", "value": "By employing a neutral gas shielding (NGS) model to characterize impurity granule \r\ninjection the pedestal atomic deposition for three different species of granule: \r\nlithium, boron, and carbon are determined. Utilizing the duration of ablation \r\nevents recorded on experiments performed at DIII-D to calibrate the NGS model we \r\nare able to quantify the ablation rate and mass deposition location with respect \r\nto the plasma density profile. The species specific granule shielding constant \r\nis then used to model granule ablation within NSTX-U discharges. Simulations of \r\n300, 500 and 700 micron diameter granules injected at 50 m/sec are presented for \r\nNSTX-U L-mode type plasmas as well as H-mode discharges with low natural ELM \r\nfrequencies. Additionally, ablation calculations of 500 micron granules of each \r\nspecies are presented at velocities ranging from 50 \ufffd 150 m/sec. In H-mode type \r\ndischarges these simulations show that the majority of the injected granule is \r\nablated within or just past the steep gradient region of the discharge. At this \r\nradial position, the perturbation to the background plasma generated by the ablating \r\ngranule can lead to conditions advantageous for the rapid triggering of an ELM crash \r\nevent.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion vol. 57 p. 076008 (July 2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://doi.org/10.1066/1741-4326/aa6cd3", "language": null }, { "key": "dc.subject", "value": "Impurity granule injection", "language": "en_US" }, { "key": "dc.subject", "value": "Neutral gas shielding", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.title", "value": "Multi-species impurity granule injection and mass deposition projections in NSTX-U discharges Authors", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 89514, "name": "Scenario Development During Commissioning Operations on the National Spherical Torus Experiment Upgrade", "handle": "88435/dsp01r781wj699", "type": "item", "link": "/rest/items/89514", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-02-23 14:10:48.872", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Battaglia, D.J.", "language": null }, { "key": "dc.contributor.author", "value": "Boyer, M.D.", "language": null }, { "key": "dc.contributor.author", "value": "Gerhardt, S.", "language": null }, { "key": "dc.contributor.author", "value": "Mueller, D.", "language": null }, { "key": "dc.contributor.author", "value": "Myers, C.E.", "language": null }, { "key": "dc.contributor.author", "value": "Guttenfelder, W.", "language": null }, { "key": "dc.contributor.author", "value": "Menard, J.E.", "language": null }, { "key": "dc.contributor.author", "value": "Sabbagh, S.A.", "language": null }, { "key": "dc.contributor.author", "value": "Scotti, F.", "language": null }, { "key": "dc.contributor.author", "value": "Bedoya, F.", "language": null }, { "key": "dc.contributor.author", "value": "Bell, R.E.", "language": null }, { "key": "dc.contributor.author", "value": "Berkery, J.W.", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "Ferraro, N.", "language": null }, { "key": "dc.contributor.author", "value": "Jaworski, M.A.", "language": null }, { "key": "dc.contributor.author", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.author", "value": "LeBlanc, B.P.", "language": null }, { "key": "dc.contributor.author", "value": "Ono, M.", "language": null }, { "key": "dc.contributor.author", "value": "Park, J.-K.", "language": null }, { "key": "dc.contributor.author", "value": "Podesta, M.", "language": null }, { "key": "dc.contributor.author", "value": "Raman, R.", "language": null }, { "key": "dc.contributor.author", "value": "Soukhanovskii, V.A.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-01-11T21:20:52Z", "language": null }, { "key": "dc.date.available", "value": "2018-01-11T21:20:52Z", "language": null }, { "key": "dc.date.issued", "value": "2018-04", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01r781wj699", "language": null }, { "key": "dc.description.abstract", "value": "The National Spherical Torus Experiment Upgrade (NSTX-U) will advance the physics basis required for achieving steady-state, high-beta, and high-confinement conditions in a tokamak by accessing high toroidal field (1 T) and plasma current (1.0 - 2.0 MA) in a low aspect ratio geometry (A = 1.6 - 1.8) with flexible auxiliary heating systems (12 MW NBI, 6 MW HHFW). This paper describes progress in the development of L- and H-mode discharge scenarios and the commissioning of operational tools in the first ten weeks of operation that enable the scientific mission of NSTX-U. Vacuum field calculations completed prior to operations supported the rapid development and optimization of inductive breakdown at different values of ohmic solenoid current. The toroidal magnetic field (B_T0 = 0.65 T) exceeded the maximum values achieved on NSTX and novel long-pulse L-mode discharges with regular sawtooth activity exceeded the longest pulses produced on NSTX (tpulse > 1.8s). The increased flux of the central solenoid facilitated the development of stationary L-mode discharges over a range of density and plasma current (Ip). H-mode discharges achieved similar levels of stored energy, confinement (H98y,2 > 1) and stability (beta_N/beta_N-nowall > 1) compared to NSTX discharges for Ip < 1 MA. High-performance H-mode scenarios require an L-H transition early in the Ip ramp-up phase in order to obtain low internal inductance (li) throughout the discharge, which is conducive to maintaining vertical stability at high elongation (kappa > 2.2) and achieving long periods of MHD quiescent operations. The rapid progress in developing L- and H-mode scenarios in support of the scientific program was enabled by advances in real-time plasma control, efficient error field identification and correction, effective conditioning of the graphite wall and excellent diagnostic availability.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion vol. 58 p. 046010 (April 2018)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/aaa6e0", "language": null }, { "key": "dc.subject", "value": "Scenario development", "language": "en_US" }, { "key": "dc.subject", "value": "Real-time control", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.subject", "value": "Spherical tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Wall conditioning", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamak startup", "language": "en_US" }, { "key": "dc.subject", "value": "Error field correction", "language": "en_US" }, { "key": "dc.subject", "value": "L-mode", "language": "en_US" }, { "key": "dc.subject", "value": "H-mode", "language": "en_US" }, { "key": "dc.title", "value": "Scenario Development During Commissioning Operations on the National Spherical Torus Experiment Upgrade", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 95611, "name": "Elemental and topographical imaging of microscopic variations in deposition on NSTX-U and DIII-D samples2", "handle": "88435/dsp01zg64tp73f", "type": "item", "link": "/rest/items/95611", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-04-16 04:13:15.157", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "C.H. Skinner, C.P. Chrobak, R. Kaita, B.E.Koel", "language": null }, { "key": "dc.date.accessioned", "value": "2019-04-15T15:55:44Z", "language": null }, { "key": "dc.date.available", "value": "2019-04-15T15:55:44Z", "language": null }, { "key": "dc.date.issued", "value": "2019-04", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01zg64tp73f", "language": null }, { "key": "dc.description.abstract", "value": "Abstract: \t\tTokamak plasma facing components have surface roughness that can cause microscopic spatial variations in erosion and deposition and hence influence material migration, erosion lifetime, dust and tritium accumulation, and plasma contamination. However high spatial resolution measurements of deposition on the scale of the surface roughness have been lacking to date. We will present elemental images of graphite samples from NSTX-U and DIII-D DiMES experiments performed with a Scanning Auger Microprobe at sub-micron resolution that show strong microscopic variations in deposition and correlate this with 3D topographical maps of surface irregularities. The NSTX-U samples were boronized and exposed to deuterium plasmas and the DiMES samples had localized Al and W films and were exposed to dedicated helium plasmas. Topographical maps of the samples were performed with a 3D confocal optical microscope and compared to the elemental deposition pattern. The results revealed localized deposition concentrated in areas shadowed from the ion flux, incident in a direction calculated (for the DiMES case) by taking account of the magnetic pre-sheath.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Materials and Energy", "language": "en_US" }, { "key": "dc.subject", "value": "Erosion, Deposition, NSTX-U, DIMES, Plasma-Materials Interaction, Surface Analysis", "language": "en_US" }, { "key": "dc.title", "value": "Elemental and topographical imaging of microscopic variations in deposition on NSTX-U and DIII-D samples2", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 82492, "name": "Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade", "handle": "88435/dsp01jh343v73t", "type": "item", "link": "/rest/items/82492", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-08-10 09:03:58.002", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Liu, D.", "language": null }, { "key": "dc.contributor.author", "value": "Heidbrink, W.W.", "language": null }, { "key": "dc.contributor.author", "value": "Tritz, K.", "language": null }, { "key": "dc.contributor.author", "value": "Fredrickson, E.D.", "language": null }, { "key": "dc.contributor.author", "value": "Hao, G.Z.", "language": null }, { "key": "dc.contributor.author", "value": "Zhu, Y.B.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-07-01T14:54:06Z", "language": null }, { "key": "dc.date.available", "value": "2016-07-01T14:54:06Z", "language": null }, { "key": "dc.date.issued", "value": "2016-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01jh343v73t", "language": null }, { "key": "dc.description.abstract", "value": "A compact and multi-view Solid State Neutral Particle Analyzer (SSNPA) diagnostic based on silicon photodiode arrays has been successfully tested on the National Spherical Torus Experiment-Upgrade (NSTX-U). The SSNPA diagnostic provides spatially, temporally, and pitch-angle resolved measurements of fast-ion distribution by detecting fast neutral flux resulting from charge exchange (CX) reactions. The system consists of three 16-channel subsystems: t-SSNPA viewing the plasma mid-radius and neutral beam (NB) line #2 tangentially, r-SSNPA viewing the plasma core and NB line #1 radially and p-SSNPA with no intersection with any NB lines. Due to the setup geometry, the active CX signals of t-SSNPA and r-SSNPA are mainly sensitive to passing and trapped particles respectively. In addition, both t-SSNPA and r-SSNPA utilize three vertically stacked arrays with different filter thickness to obtain coarse energy information. The experimental data show that all channels are operational. The signal to noise ratio is typically larger than 10 and the main noise is x-ray induced signal. The active and passive CX signals are clearly observed on t-SSNPA and r-SSNPA during NB modulation. The SSNPA data also indicate significant losses of passing particles during sawteeth, while trapped particles are weakly affected. Fluctuations up to 120 kHz, have been observed on SSNPA, and they are strongly correlated with magnetohydrodynamics (MHD) instabilities.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments, Vol. 87, p. 11D803 (November 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4959798", "language": null }, { "key": "dc.subject", "value": "Charge exchange neutral particle", "language": "en_US" }, { "key": "dc.subject", "value": "fast ion distribution", "language": "en_US" }, { "key": "dc.subject", "value": "Silicon photodiodes", "language": "en_US" }, { "key": "dc.title", "value": "Compact and multi-view solid state neutral particle analyzer arrays on National Spherical Torus Experiment-Upgrade", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 83268, "name": "Far-infrared tangential interferometer/polarimeter design and installation for NSTX-U", "handle": "88435/dsp01hx11xh71b", "type": "item", "link": "/rest/items/83268", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-08-10 09:01:39.315", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Scott, E.R.", "language": null }, { "key": "dc.contributor.author", "value": "Barchfeld, R.", "language": null }, { "key": "dc.contributor.author", "value": "Riemenschneider, P.", "language": null }, { "key": "dc.contributor.author", "value": "Domier, C.W.", "language": null }, { "key": "dc.contributor.author", "value": "Muscatello, C.M.", "language": null }, { "key": "dc.contributor.author", "value": "Sohrabi, M.", "language": null }, { "key": "dc.contributor.author", "value": "Kaita, R.", "language": null }, { "key": "dc.contributor.author", "value": "Ren, Y.", "language": null }, { "key": "dc.contributor.author", "value": "Luhmann Jr., N.C.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-08-03T18:35:19Z", "language": null }, { "key": "dc.date.available", "value": "2016-08-03T18:35:19Z", "language": null }, { "key": "dc.date.issued", "value": "2016-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01hx11xh71b", "language": null }, { "key": "dc.description.abstract", "value": "The Far-infrared Tangential Interferometer/Polarimeter (FIReTIP) system has been refurbished and\r\nis being reinstalled on the National Spherical Torus Experiment-Upgrade (NSTX-U) to supply\r\nreal-time line-integrated core electron density measurements for use in the NSTX-U plasma control\r\nsystem (PCS) to facilitate real-time density feedback control of the NSTX-U plasma. Inclusion\r\nof a visible light heterodyne interferometer in the FIReTIP system allows for real-time vibration\r\ncompensation due to movement of an internally mounted retroreflector and the FIReTIP front-end\r\noptics. Real-time signal correction is achieved through use of a National Instruments CompactRIO\r\nfield-programmable gate array.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments, Vol. 87, p. 11E114 (November 2016)", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.subject", "value": "Density", "language": "en_US" }, { "key": "dc.subject", "value": "Interferometry", "language": "en_US" }, { "key": "dc.subject", "value": "FIReTIP", "language": "en_US" }, { "key": "dc.title", "value": "Far-infrared tangential interferometer/polarimeter design and installation for NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 88967, "name": "Application of Benchmarked Kinetic Resistive Wall Mode Stability Codes to ITER, Including Additional Physics", "handle": "88435/dsp01td96k5188", "type": "item", "link": "/rest/items/88967", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-11-01 04:06:02.458", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Berkery, J.W.", "language": null }, { "key": "dc.contributor.author", "value": "Wang, Z.R.", "language": null }, { "key": "dc.contributor.author", "value": "Sabbagh, S.A.", "language": null }, { "key": "dc.contributor.author", "value": "Liu, Y.Q.", "language": null }, { "key": "dc.contributor.author", "value": "Betti, R.", "language": null }, { "key": "dc.contributor.author", "value": "Guazotto, L.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-10-31T20:42:53Z", "language": null }, { "key": "dc.date.available", "value": "2017-10-31T20:42:53Z", "language": null }, { "key": "dc.date.issued", "value": "2017-10", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01td96k5188", "language": null }, { "key": "dc.description.abstract", "value": "Leading resistive wall mode (RWM) stability codes MARS-K [Y. Liu, et al., Phys. Plasmas 15, 112503 (2008)] and MISK [B. Hu, et al., Phys. Plasmas 12, 057301 (2005)] have been previously benchmarked. The benchmarking has now been extended to include additional physics, and used to project the stability of ITER in a realistic operating space. Due to ITER's relatively low plasma rotation and collisionality, collisions and non-resonance rotational effects were both found to have little impact on stability, and these non-resonance rotational effects also will not self-consistently affect the ITER RWM eigenfunction. Resonances between thermal ions and electrons and the expected level of ITER toroidal rotation were found to be important to stability, as were alpha particles, which are not in rotational resonance. MISK calculations show that without alpha particles, ITER is projected to be unstable to the RWM, but the expected level of alphas is calculated to provide a sufficient level of stability.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas (October 2017)", "language": "en_US" }, { "key": "dc.subject", "value": "ITER", "language": "en_US" }, { "key": "dc.subject", "value": "MISK", "language": "en_US" }, { "key": "dc.subject", "value": "MARS-K", "language": "en_US" }, { "key": "dc.subject", "value": "Resistive Wall Mode Stability", "language": "en_US" }, { "key": "dc.title", "value": "Application of Benchmarked Kinetic Resistive Wall Mode Stability Codes to ITER, Including Additional Physics", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 90607, "name": "Regarding the optimization of O1-mode ECRH and the feasibility of EBW startup on NSTX-U", "handle": "88435/dsp01b5644v24d", "type": "item", "link": "/rest/items/90607", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-05-11 15:45:33.454", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Lopez, N", "language": null }, { "key": "dc.contributor.author", "value": "Poli, F", "language": null }, { "key": "dc.date.accessioned", "value": "2018-05-07T13:45:05Z", "language": null }, { "key": "dc.date.available", "value": "2018-05-07T13:45:05Z", "language": null }, { "key": "dc.date.issued", "value": "2018-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01b5644v24d", "language": null }, { "key": "dc.description.abstract", "value": "Recently published scenarios for fully non-inductive startup and operation on the National Spherical\r\nTorus eXperiment Upgrade (NSTX-U) (Menard et al 2012 Nucl. Fusion 52 083015) show Electron\r\nCyclotron Resonance Heating (ECRH) as an important component in preparing a target plasma for\r\nefficient High Harmonic Fast Wave and Neutral Beam heating. The modeling of the propagation and\r\nabsorption of EC waves in the evolving plasma is required to define the most effective window of\r\noperation, and to optimize the launcher geometry for maximal heating and current drive during this\r\nwindow. Here, we extend a previous optimization of O1-mode ECRH on NSTX-U to account for the\r\nfull time-dependent performance of the ECRH using simulations performed with TRANSP. We find\r\nthat the evolution of the density profile has a prominent role in the optimization by defining the time\r\nwindow of operation, which in certain cases may be a more important metric to compare launcher\r\nperformance than the average power absorption. This feature cannot be captured by analysis on static\r\nprofiles, and should be accounted for when optimizing ECRH on any device that operates near the\r\ncutoff density. Additionally, the utility of the electron Bernstein wave (EBW) in driving current and\r\ngenerating closed flux surfaces in the early startup phase has been demonstrated on a number of\r\ndevices. Using standalone GENRAY simulations, we find that efficient EBW current drive is\r\npossible on NSTX-U if the injection angle is shifted below the midplane and aimed towards the top\r\nhalf of the vacuum vessel. However, collisional damping of the EBW is projected to be significant, in\r\nsome cases accounting for up to 97% of the absorbed EBW power", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Physics and Controlled Fusion, Vol. 60, p. 065007 (June 2018)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1361-6587/aabaa8", "language": "en_US" }, { "key": "dc.subject", "value": "Electron cyclotron", "language": "en_US" }, { "key": "dc.subject", "value": "Startup", "language": "en_US" }, { "key": "dc.subject", "value": "Spherical Tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Electron Bernstein wave", "language": "en_US" }, { "key": "dc.title", "value": "Regarding the optimization of O1-mode ECRH and the feasibility of EBW startup on NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 82678, "name": "Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U", "handle": "88435/dsp0105741v14g", "type": "item", "link": "/rest/items/82678", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-07-07 01:15:15.725", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Frerichs, H.", "language": null }, { "key": "dc.contributor.author", "value": "Waters, I.", "language": null }, { "key": "dc.contributor.author", "value": "Schmitz, O.", "language": null }, { "key": "dc.contributor.author", "value": "Canal, G.P.", "language": null }, { "key": "dc.contributor.author", "value": "Evans, T.E.", "language": null }, { "key": "dc.contributor.author", "value": "Feng, Y.", "language": null }, { "key": "dc.contributor.author", "value": "Soukhanovskii, V.A.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-07-06T15:54:12Z", "language": null }, { "key": "dc.date.available", "value": "2016-07-06T15:54:12Z", "language": null }, { "key": "dc.date.issued", "value": "2016-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp0105741v14g", "language": null }, { "key": "dc.description.abstract", "value": "The control of divertor heat loads - both steady state and transient - remains a key challenge for the successful operation of ITER and FNSF. Magnetic perturbations provide a promising technique to control ELMs (transients), but understanding their detailed impact is difficult due to their symmetry breaking nature. One approach for reducing steady state heat loads are so called 'advanced divertors' which aim at optimizing the magnetic field configuration: the snowflake and the (super-)X-divertor. It is likely that both concepts - magnetic perturbations and advanced divertors - will have to work together, and we explore their interaction based on the NSTX-U setup. An overview of different divertor configurations under the impact of magnetic perturbations is presented, and the resulting impact on plasma edge transport is investigated with the EMC3-EIRENE code.\r\nVariations in size of the magnetic footprint of the perturbed separatrix are found, which is related to the level of flux expansion on the divertor target. Non-axisymmetric peaking of the heat flux related to the perturbed separatrix is found at the outer strike point, but only in locations where flux expansion is not too large.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas, Vol. 23, p. 062517 (June 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4954816", "language": "en_US" }, { "key": "dc.subject", "value": "Edge plasma modeling", "language": "en_US" }, { "key": "dc.subject", "value": "Advanced Divertors", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.title", "value": "Exploration of magnetic perturbation effects on advanced divertor configurations in NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 87165, "name": "Suppression of Alfv\u00e9n modes on NSTX-U with outboard beam injection", "handle": "88435/dsp017h149s49b", "type": "item", "link": "/rest/items/87165", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-20 16:00:30.516", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Fredrickson, E.D.", "language": null }, { "key": "dc.contributor.author", "value": "Belova, E.V.", "language": null }, { "key": "dc.contributor.author", "value": "Battaglia, D.J.", "language": null }, { "key": "dc.contributor.author", "value": "Bell, R.E.", "language": null }, { "key": "dc.contributor.author", "value": "Crocker, N.A.", "language": null }, { "key": "dc.contributor.author", "value": "Darrow, D.S.", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "Gerhardt, S.P.", "language": null }, { "key": "dc.contributor.author", "value": "Gorelenkov, N.N.", "language": null }, { "key": "dc.contributor.author", "value": "LeBlanc, B.P.", "language": null }, { "key": "dc.contributor.author", "value": "Podesta, M.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-07-20T20:00:30Z", "language": null }, { "key": "dc.date.available", "value": "2017-07-20T20:00:30Z", "language": null }, { "key": "dc.date.issued", "value": "2017-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp017h149s49b", "language": null }, { "key": "dc.description.abstract", "value": "In this paper we present data from experiments on NSTX-U where it is shown for the first time that small amounts of high pitch-angle beam ions can strongly suppress the counter-propagating Global Alfve\u0301n Eigenmodes (GAE). GAE have been implicated in the redistribution of fast ions and modification of the electron power balance in previous experiments on NSTX. The ability to predict the stability of Alfve\u0301n modes, and developing methods to control them, is important for fusion reactor like the International Tokamak Experimental Reactor (ITER) which are heated by a large population of non-thermal, super-Alfve\u0301nic ions consisting of fusion generated alphas and beam ions injected for current profile control. We present a qualitative interpretation of these observations using an analytic model of the Doppler-shifted ion-cyclotron resonance drive responsible for GAE instability which has an important dependence on k\u22a5\u03c1L. A quantitative analysis of this data with the HYM stability code predicts both the frequencies and instability of the GAE prior to, and suppression of the GAE after the injection of high pitch-angle beam ions.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physical Review Letters, vol. 118, p. 265001 (June 2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "10.1103/PhysRevLett.118.265001", "language": "en_US" }, { "key": "dc.subject", "value": "Global Alfven Eigenmodes", "language": "en_US" }, { "key": "dc.subject", "value": "Energetic particles", "language": "en_US" }, { "key": "dc.subject", "value": "Super-Alfvenic", "language": "en_US" }, { "key": "dc.title", "value": "Suppression of Alfv\u00e9n modes on NSTX-U with outboard beam injection", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 93074, "name": "Two-dimensional full-wave simulations of waves in space and tokamak plasmas", "handle": "88435/dsp01gf06g542h", "type": "item", "link": "/rest/items/93074", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-10-03 09:42:55.302", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Kim, E.-W.", "language": null }, { "key": "dc.contributor.author", "value": "Bertelli, N.", "language": null }, { "key": "dc.contributor.author", "value": "Johnson, J.R.", "language": null }, { "key": "dc.contributor.author", "value": "Valeo, E.", "language": null }, { "key": "dc.contributor.author", "value": "Hosea, J.", "language": null }, { "key": "dc.contributor.author", "value": "Perkins, R.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-10-03T13:42:54Z", "language": null }, { "key": "dc.date.available", "value": "2018-10-03T13:42:54Z", "language": null }, { "key": "dc.date.issued", "value": "2018-10", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01gf06g542h", "language": null }, { "key": "dc.description.abstract", "value": "We illustrate the capabilities of a recently developed two-dimensional full wave code (FW2D) in space and tokamak plasmas by adopting various values of density, magnetic field configuration and strength as well as boundary shape. As example, we first showed fast compressional wave propagation in the inner magnetosphere is dramatically modified by a plasmaspheric plume at Earth's magnetosphere. The results show that wave energy is trapped in the plume showing a leaky eigenmode-like structure with plume, which is similar to the detected magnetosonic waves. We also performed simulations of high harmonic fast waves in the scrape-off layer (SOL) plasmas of the National Spherical Torus eXperiment (NSTX)/NSTX-Upgrade. Comparison the results with previous full-wave simulations show that although the FW2D code uses a cold plasma approximation, the electric field and the fraction of the power losses in the SOL plasmas show excellent consistency and agreement with the previous full wave simulations performed by the AORSA code.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Phys. Plasmas", "language": "en_US" }, { "key": "dc.title", "value": "Two-dimensional full-wave simulations of waves in space and tokamak plasmas", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 95571, "name": "Design and simulation of the snowflake divertor control for NSTX-U", "handle": "88435/dsp01jm214r94t", "type": "item", "link": "/rest/items/95571", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-04-03 04:10:10.617", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Vail, P. J.", "language": null }, { "key": "dc.contributor.author", "value": "Boyer, M. D.", "language": null }, { "key": "dc.contributor.author", "value": "Welander, A. S.", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, E.", "language": null }, { "key": "dc.contributor.author", "value": "U.S. Department of Energy contract number DE-AC02-09CH11466", "language": null }, { "key": "dc.date.accessioned", "value": "2019-04-02T11:50:17Z", "language": null }, { "key": "dc.date.available", "value": "2019-04-02T11:50:17Z", "language": null }, { "key": "dc.date.issued", "value": "2019-04", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01jm214r94t", "language": null }, { "key": "dc.description.abstract", "value": "This paper presents the development of a physics-based multiple-input-multiple-output algorithm for real-time feedback control of snowflake divertor (SFD) configurations on the National Spherical Torus eXperiment Upgrade (NSTX-U). A model of the SFD configuration response to applied voltages on the divertor control coils is first derived and then used, in conjunction with multivariable control synthesis techniques, to design an optimal state feedback controller for the configuration. To demonstrate the capabilities of the controller, a nonlinear simulator for axisymmetric shape control was developed for NSTX-U which simultaneously evolves the currents in poloidal field coils based upon a set of feedback-computed voltage commands, calculates the induced currents in passive conducting structures, and updates the plasma equilibrium by solving the free-boundary Grad-Shafranov problem. Closed-loop simulations demonstrate that the algorithm enables controlled operations in a variety of SFD configurations and provides capabilities for accurate tracking of time-dependent target trajectories for the divertor geometry. In particular, simulation results suggest that a time-varying controller which can properly account for the evolving SFD dynamical response is not only desirable but necessary for achieving acceptable control performance. The algorithm presented in this paper has been implemented in the NSTX-U Plasma Control System in preparation for future control and divertor physics experiments.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Physics and Controlled Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "snowflake divertor, MIMO feedback control, nonlinear simulation, NSTX-U", "language": "en_US" }, { "key": "dc.title", "value": "Design and simulation of the snowflake divertor control for NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 82992, "name": "Real-time Radiative Divertor Feedback Control Development for the NSTX-U Tokamak using a Vacuum Ultraviolet Spectrometer", "handle": "88435/dsp014x51hm47x", "type": "item", "link": "/rest/items/82992", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-08-05 12:29:39.742", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Soukhanovskii, V.A.", "language": null }, { "key": "dc.contributor.author", "value": "Kaita, R.", "language": null }, { "key": "dc.contributor.author", "value": "Stratton, B.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-07-15T17:30:32Z", "language": null }, { "key": "dc.date.available", "value": "2016-07-15T17:30:32Z", "language": null }, { "key": "dc.date.issued", "value": "2016-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp014x51hm47x", "language": null }, { "key": "dc.description.abstract", "value": "A radiative divertor technique is planned for the NSTX-U tokamak to prevent excessive erosion and thermal damage of divertor plasma-facing components in H-mode plasma discharges with auxiliary heating up to 12 MW. \r\nIn the radiative (partially detached) divertor, extrinsically seeded deuterium or impurity gases are used to increase\r\nplasma volumetric power and momentum losses. \r\nA real-time feedback control of the gas seeding rate is planned for discharges of up to 5 s duration.\r\nThe outer divertor leg plasma electron temperature Te estimated spectroscopically in real time will be used as a control parameter.\r\nA vacuum ultraviolet spectrometer McPherson Model 251 with a fast charged-coupled device detector is developed for temperature monitoring between 5 and 30 eV, based on the delta n=0;1 line intensity ratios of carbon, nitrogen or neon ions lines in the spectral range 300 to 1600 A.\r\nA collisional-radiative model-based line intensity ratio will be used for relative calibration.\r\nA real-time Te-dependent signal within a characteristic divertor detachment equilibration time of ~ 10-15 ms is expected.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments, Vol. 87, p. 11D605 (November 2016)", "language": "en_US" }, { "key": "dc.subject", "value": "Vacuum ultraviolet", "language": "en_US" }, { "key": "dc.subject", "value": "Spectroscopy", "language": "en_US" }, { "key": "dc.subject", "value": "Divertor", "language": "en_US" }, { "key": "dc.subject", "value": "Detachment", "language": "en_US" }, { "key": "dc.subject", "value": "Impurities", "language": "en_US" }, { "key": "dc.title", "value": "Real-time Radiative Divertor Feedback Control Development for the NSTX-U Tokamak using a Vacuum Ultraviolet Spectrometer", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 83205, "name": "Fusion Nuclear Science Facilities and Pilot Plants Based on the Spherical Tokamak", "handle": "88435/dsp01pn89d906g", "type": "item", "link": "/rest/items/83205", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-08-16 11:57:35.087", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Menard, J.E.", "language": null }, { "key": "dc.contributor.author", "value": "Brown, T.", "language": null }, { "key": "dc.contributor.author", "value": "El-Guebaly, L.", "language": null }, { "key": "dc.contributor.author", "value": "Boyer, M.", "language": null }, { "key": "dc.contributor.author", "value": "Canik, J.", "language": null }, { "key": "dc.contributor.author", "value": "Colling, B.", "language": null }, { "key": "dc.contributor.author", "value": "Raman, R.", "language": null }, { "key": "dc.contributor.author", "value": "Wang, Z.", "language": null }, { "key": "dc.contributor.author", "value": "Zhai, Y.", "language": null }, { "key": "dc.contributor.author", "value": "Buxton, P.", "language": null }, { "key": "dc.contributor.author", "value": "Covele, B.", "language": null }, { "key": "dc.contributor.author", "value": "D'Angelo, C.", "language": null }, { "key": "dc.contributor.author", "value": "Davis, A.", "language": null }, { "key": "dc.contributor.author", "value": "Gerhardt, S.", "language": null }, { "key": "dc.contributor.author", "value": "Gryaznevich, M.", "language": null }, { "key": "dc.contributor.author", "value": "Harb, M.", "language": null }, { "key": "dc.contributor.author", "value": "Hender, T.C.", "language": null }, { "key": "dc.contributor.author", "value": "Kaye, S.", "language": null }, { "key": "dc.contributor.author", "value": "Kingham, D.", "language": null }, { "key": "dc.contributor.author", "value": "Kotschenreuther, M.", "language": null }, { "key": "dc.contributor.author", "value": "Mahajan, S.", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.contributor.author", "value": "Marriott, E.", "language": null }, { "key": "dc.contributor.author", "value": "Meier, E.T.", "language": null }, { "key": "dc.contributor.author", "value": "Mynsberge, L.", "language": null }, { "key": "dc.contributor.author", "value": "Neumeyer, C.", "language": null }, { "key": "dc.contributor.author", "value": "Ono, M.", "language": null }, { "key": "dc.contributor.author", "value": "Park, J.-K.", "language": null }, { "key": "dc.contributor.author", "value": "Sabbagh, S.A.", "language": null }, { "key": "dc.contributor.author", "value": "Soukhanovskii, V.", "language": null }, { "key": "dc.contributor.author", "value": "Valanju, P.", "language": null }, { "key": "dc.contributor.author", "value": "Woolley, R.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-08-02T16:21:37Z", "language": null }, { "key": "dc.date.available", "value": "2016-08-02T16:21:37Z", "language": null }, { "key": "dc.date.issued", "value": "2016-10", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01pn89d906g", "language": null }, { "key": "dc.description.abstract", "value": "A Fusion Nuclear Science Facility (FNSF) could play an important role in the development of fusion energy by providing the nuclear environment needed to develop fusion materials and components. The spherical torus/tokamak (ST) is a leading candidate for an FNSF due to its potentially high neutron wall loading and modular configuration. A key consideration for the choice of FNSF configuration is the range of achievable missions as a function of device size. Possible missions include: providing high neutron wall loading and fluence, demonstrating tritium self-sufficiency, and demonstrating electrical self-sufficiency. All of these missions must also be compatible with a viable divertor, first-wall, and blanket solution. ST-FNSF configurations have been developed simultaneously incorporating for the first time: (1) a blanket system capable of tritium breeding ratio TBR approximately 1, (2) a poloidal field coil set supporting high elongation and triangularity for a range of internal inductance and normalized beta values consistent with NSTX/NSTX-U previous/planned operation, (3) a long-legged divertor analogous to the MAST-U divertor which substantially reduces projected peak divertor heat-flux and has all outboard poloidal field coils outside the vacuum chamber and superconducting to reduce power consumption, and (4) a vertical maintenance scheme in which blanket structures and the centerstack can be removed independently. Progress in these ST-FNSF missions vs. configuration studies including dependence on plasma major radius R0 for a range 1m to 2.2m are described. In particular, it is found the threshold major radius for TBR = 1 is R0 greater than or equal to 1.7m, and a smaller R0=1m ST device has TBR approximately 0.9 which is below unity but substantially reduces T consumption relative to not breeding. Calculations of neutral beam heating and current drive for non-inductive ramp-up and sustainment are described. An A=2, R0=3m device incorporating high-temperature superconductor toroidal field coil magnets capable of high neutron fluence and both tritium and electrical self-sufficiency is also presented following systematic aspect ratio studies.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion, vol. 56, p. 106023 (October 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1088/0029-5515/56/10/106023", "language": null }, { "key": "dc.subject", "value": "Fusion nuclear science facility", "language": "en_US" }, { "key": "dc.subject", "value": "Pilot plant", "language": "en_US" }, { "key": "dc.subject", "value": "Spherical tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Tritium breeding", "language": "en_US" }, { "key": "dc.subject", "value": "Negative neutral beams", "language": "en_US" }, { "key": "dc.subject", "value": "Super-X divertor", "language": "en_US" }, { "key": "dc.subject", "value": "High-temperature superconductors", "language": "en_US" }, { "key": "dc.title", "value": "Fusion Nuclear Science Facilities and Pilot Plants Based on the Spherical Tokamak", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stanley, Kaye", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 80787, "name": "Large-volume flux closure during plasmoid-mediated reconnection in coaxial helicity injection", "handle": "88435/dsp01hh63sz30p", "type": "item", "link": "/rest/items/80787", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-06-17 15:08:36.435", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Ebrahimi, F.", "language": null }, { "key": "dc.contributor.author", "value": "Raman, R.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-04-21T16:32:08Z", "language": null }, { "key": "dc.date.available", "value": "2016-04-21T16:32:08Z", "language": null }, { "key": "dc.date.issued", "value": "2016-04", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01hh63sz30p", "language": null }, { "key": "dc.description.abstract", "value": "A large-volume flux closure during transient coaxial helicity injection (CHI) in NSTX-U\r\nis demonstrated through resistive magnetohydrodynamics (MHD) simulations. Several\r\nmajor improvements, including the improved positioning of the divertor poloidal field coils, are projected to improve the CHI start-up phase in NSTX-U. Simulations in the NSTX-U configuration with constant in time coil currents show that with strong flux shaping the injected open field lines (injector flux) rapidly reconnect and form large volume of closed flux surfaces. This is achieved by driving parallel current in the injector flux coil and oppositely directed currents in the flux shaping coils to form a narrow injector flux footprint and push the injector flux into the vessel. As the helicity and plasma are injected into the device, the oppositely directed field lines in the injector region are forced to reconnect through a local Sweet\u2013Parker type reconnection, or to spontaneously reconnect when the elongated current sheet becomes MHD unstable to form plasmoids. In these simulations for the first time, it is found that the closed flux is over 70% of the initial injector flux used to initiate the discharge. These results could work well for the application of transient CHI in devices that employ super conducting coils to generate and sustain the plasma equilibrium.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion, vol. 56, p. 044002, April 2016", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "doi:10.1088/0029-5515/56/4/044002", "language": "en_US" }, { "key": "dc.subject", "value": "Magnetic reconnection", "language": "en_US" }, { "key": "dc.subject", "value": "Current Drive", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamaks", "language": "en_US" }, { "key": "dc.title", "value": "Large-volume flux closure during plasmoid-mediated reconnection in coaxial helicity injection", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": "en_US" }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 83507, "name": "Development of miniaturized, spectroscopically assisted Penning gauges for fractional helium and hydrogen neutral pressure measurements", "handle": "88435/dsp019z903232z", "type": "item", "link": "/rest/items/83507", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-11-14 12:00:52.834", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Flesch, K.", "language": null }, { "key": "dc.contributor.author", "value": "Kremeyer, T.", "language": null }, { "key": "dc.contributor.author", "value": "Schmitz, O.", "language": null }, { "key": "dc.contributor.author", "value": "Soukhanovskii, V.", "language": null }, { "key": "dc.contributor.author", "value": "Wenzel, U.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-08-18T19:32:17Z", "language": null }, { "key": "dc.date.available", "value": "2016-08-18T19:32:17Z", "language": null }, { "key": "dc.date.issued", "value": "2016-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp019z903232z", "language": null }, { "key": "dc.description.abstract", "value": "Direct measurements of the helium (He) fractional neutral pressure in the neutral gas around fusion devices is challenging because of the small mass difference between the abundant D2 molecules and the He atoms which will be produced by D-T fusion. To study He exhaust, Penning gauges were used to measure total neutral pressure assisted by spectroscopy to resolve the D and He partial pressures. In this contribution, initial results are shown from developing this technique into a miniaturized configuration for direct in-situ measurements in the divertor of fusion devices. The configuration is based off a gauge originally designed for the National Spherical Tokamak Experiment-Upgrade (NSTX-U). The goal of this new miniaturized design it to reduce the space required by the gauge on the device and use of the inherent magnetic field of the machine rather than permanent magnets inside the gauge, enabling it to be adapted into a system that can be extended directly into the divertor region. The feasibility test of the method for NSTX-U and the Wendelstein 7-X (W7-X) stellarator are surveyed. For W7-X, a commercial Penning Gauge has been installed on an outboard vacuum flange as a generic feasibility test in the neutral gas environment of a stellarator. At an integration time of 25s, helium lines can be seen down to 10^-5 mbar and H-alpha lines down to 10^-6 mbar. Successful measurement of the total as well as the fractional neutral pressures of He and H has been shown. A first prototype of the miniature Penning gauge has been tested in Madison and shows a near linear power law scaling between current and pressure: I = C*P^n with n = 1.0 - 1.2. Pressure measurements were achieved starting at 10^-3 mbar and down to 10^-6 mbar. A modular gauge is being assembled, which allows easy interchangeability of the anode to test new anode geometries, in order to improve optical access and increase spectroscopic sensitivity. This shall enable an increase of the time resolution of the spectroscopically assisted fractional neutral pressure measurements to up to 1kHz.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments, vol 87, p. 11E529 (November 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4960815", "language": null }, { "key": "dc.subject", "value": "Penning gauge", "language": "en_US" }, { "key": "dc.subject", "value": "Partial pressure", "language": "en_US" }, { "key": "dc.subject", "value": "Helium spectroscopy", "language": "en_US" }, { "key": "dc.title", "value": "Development of miniaturized, spectroscopically assisted Penning gauges for fractional helium and hydrogen neutral pressure measurements", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "DE-SC0012315", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "DE-SC0014210", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "DE-AC52-07NA27344", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 94572, "name": "Real-time capable modeling of neutral beam injection on NSTX-U using neural networks", "handle": "88435/dsp01z316q438w", "type": "item", "link": "/rest/items/94572", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-03-29 13:35:34.681", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Boyer, M.D.", "language": null }, { "key": "dc.contributor.author", "value": "Kaye, S.", "language": null }, { "key": "dc.contributor.author", "value": "Erickson, K.", "language": null }, { "key": "dc.date.accessioned", "value": "2019-02-15T18:22:58Z", "language": null }, { "key": "dc.date.available", "value": "2019-02-15T18:22:58Z", "language": null }, { "key": "dc.date.issued", "value": "2019-02", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01z316q438w", "language": null }, { "key": "dc.description.abstract", "value": "A new model of heating, current drive, torque and other effects of neutral beam injection on NSTX-U that uses neural networks has been developed. The model has been trained and tested on the results of the Monte Carlo code NUBEAM for the database of experimental discharges taken during the first operational campaign of NSTX-U. By projecting flux surface quantities onto empirically derived basis functions, the model is able to efficiently and accurately reproduce the behavior of both scalars, like the total neutron rate and shine through, and profiles, like beam current drive and heating. The model has been tested on the NSTX-U real-time computer, demonstrating a rapid execution time orders of magnitude faster than the Monte Carlo code that is well suited for the iterative calculations needed to interpret experimental results, optimization during scenario development activities, and real-time plasma control applications. Simulation results of a proposed design for a nonlinear observer that embeds the neural network calculations to estimate the poloidal flux profile evolution, as well as effective charge and fast ion diffusivity, are presented.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "NUCLEAR FUSION 59 056008 (May 2019)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/ab0762", "language": null }, { "key": "dc.subject", "value": "Plasma Control", "language": "en_US" }, { "key": "dc.subject", "value": "Neutral beam modeling", "language": "en_US" }, { "key": "dc.subject", "value": "Neural networks", "language": "en_US" }, { "key": "dc.title", "value": "Real-time capable modeling of neutral beam injection on NSTX-U using neural networks", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 84607, "name": "Initial operation of the NSTX-Upgrade real-time velocity diagnostic", "handle": "88435/dsp01x920g034q", "type": "item", "link": "/rest/items/84607", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-11-15 01:11:35.672", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Podesta, M", "language": null }, { "key": "dc.contributor.author", "value": "Bell, R.E.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-11-14T17:26:31Z", "language": null }, { "key": "dc.date.available", "value": "2016-11-14T17:26:31Z", "language": null }, { "key": "dc.date.issued", "value": "2016-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01x920g034q", "language": null }, { "key": "dc.description.abstract", "value": "A real-time velocity (RTV) diagnostic based on active charge-exchange recombination spectroscopy is now operational on the National Spherical Torus Experiment-Upgrade (NSTX-U) spherical torus (Menard et al 2012 Nucl. Fusion 52 083015). The system has been designed to supply plasma velocity data in real time to the NSTX-U plasma control system, as required for the implementation of toroidal rotation control. Measurements are available from four radii at a maximum sampling frequency of 5 kHz. Post-discharge analysis of RTV data provides additional information on ion temperature, toroidal velocity and density of carbon impurities. Examples of physics studies enabled by RTV measurements from initial operations of NSTX-U are discussed.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Phys. Control. Fusion, vol. 58 p. 125016 (December 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "doi:10.1088/0741-3335/58/12/125016", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.subject", "value": "Charge exchange recombination spectroscopy", "language": "en_US" }, { "key": "dc.subject", "value": "Real-time velocity", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma rotation control", "language": "en_US" }, { "key": "dc.title", "value": "Initial operation of the NSTX-Upgrade real-time velocity diagnostic", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 89211, "name": "ELM elimination with Li powder injection in EAST discharges using the tungsten upper divertor", "handle": "88435/dsp01wp988n475", "type": "item", "link": "/rest/items/89211", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-12-09 04:06:03.09", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.contributor.author", "value": "Hu, J.S.", "language": null }, { "key": "dc.contributor.author", "value": "Sun, Z.", "language": null }, { "key": "dc.contributor.author", "value": "Tritz, K.", "language": null }, { "key": "dc.contributor.author", "value": "Zuo, G.Z.", "language": null }, { "key": "dc.contributor.author", "value": "Xu, W.", "language": null }, { "key": "dc.contributor.author", "value": "Huang, M.", "language": null }, { "key": "dc.contributor.author", "value": "Meng, X.C.", "language": null }, { "key": "dc.contributor.author", "value": "Canik, J.M.", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "Lunsford, R.", "language": null }, { "key": "dc.contributor.author", "value": "Mansfield, D.K.", "language": null }, { "key": "dc.contributor.author", "value": "Osborne, T.H.", "language": null }, { "key": "dc.contributor.author", "value": "Gong, X.Z.", "language": null }, { "key": "dc.contributor.author", "value": "Wang, Y.F.", "language": null }, { "key": "dc.contributor.author", "value": "Li, Y.Y.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-12-08T13:53:43Z", "language": null }, { "key": "dc.date.available", "value": "2017-12-08T13:53:43Z", "language": null }, { "key": "dc.date.issued", "value": "2017-12", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01wp988n475", "language": null }, { "key": "dc.description.abstract", "value": "We report the first successful use of lithium (Li) to eliminate edge-localized modes (ELMs) with tungsten divertor plasma-facing components in the EAST device. Li powder injected into the scrape-off layer of the tungsten upper divertor successfully eliminated ELMs for 3-5 sec in EAST. The ELM elimination became progressively more effective in consecutive discharges at constant lithium delivery rates, and the divertor D-alpha baseline emission was reduced, both signatures of improved wall conditioning. A modest decrease in stored energy and normalized energy confinement was also observed, but the confinement relative to H98 remained well above 1, extending the previous ELM elimination results via Li injection into the lower carbon divertor in EAST [J.S. Hu et al., Phys. Rev. Lett. 114 (2015) 055001]. These results can be compared with recent observations with lithium pellets in ASDEX-Upgrade that failed to mitigate ELMs [P.T. Lang et al., Nucl. Fusion 57 (2017) 016030], highlighting one comparative advantage of continuous powder injection for real-time ELM elimination.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion (December 2017)", "language": "en_US" }, { "key": "dc.subject", "value": "EAST", "language": "en_US" }, { "key": "dc.subject", "value": "ELMs", "language": "en_US" }, { "key": "dc.subject", "value": "Lithium", "language": "en_US" }, { "key": "dc.subject", "value": "Tungsten", "language": "en_US" }, { "key": "dc.subject", "value": "Recycling", "language": "en_US" }, { "key": "dc.title", "value": "ELM elimination with Li powder injection in EAST discharges using the tungsten upper divertor", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 81049, "name": "Massive Gas Injection Valve Development for NSTX-U", "handle": "88435/dsp01ns064844m", "type": "item", "link": "/rest/items/81049", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-05-11 01:11:07.71", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Raman, R.", "language": null }, { "key": "dc.contributor.author", "value": "Plunkett, G.J.", "language": null }, { "key": "dc.contributor.author", "value": "Way, W.-S.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-05-10T18:37:00Z", "language": null }, { "key": "dc.date.available", "value": "2016-05-10T18:37:00Z", "language": null }, { "key": "dc.date.issued", "value": "2016-05", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01ns064844m", "language": null }, { "key": "dc.description.abstract", "value": "NSTX-U research will offer new insight by studying gas assimilation efficiencies for MGI injection from different poloidal locations using identical gas injection systems. In support of this activity, an electromagnetic MGI valve has been built and tested. The valve operates by repelling two conductive disks due to eddy currents induced on them by a rapidly changing magnetic field created by a pancake disk solenoid positioned beneath the circular disk attached to a piston. The current is driven in opposite directions in the two solenoids, which creates a cancelling torque when the valve is operated in an ambient magnetic field, as would be required in a tokamak installation. The valve does not use ferromagnetic materials. Results from the operation of the valve, including tests conducted in 1 T external magnetic fields, are described. The pressure rise in the test chamber is measured directly using a fast time response baratron gauge. At a plenum pressure of just 1.38 MPa (~200 psig), the valve injects 27 Pa.m^3 (~200 Torr.L) of nitrogen with a pressure rise time of 3 ms.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and Archive zip files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "IEEE Transactions on Plasma Science", "language": "en_US" }, { "key": "dc.subject", "value": "MGI", "language": "en_US" }, { "key": "dc.subject", "value": "Disruption mitigation", "language": "en_US" }, { "key": "dc.subject", "value": "Electromagnetic", "language": "en_US" }, { "key": "dc.subject", "value": "Eddy current", "language": "en_US" }, { "key": "dc.title", "value": "Massive Gas Injection Valve Development for NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 93648, "name": "Compact steady-state tokamak performance dependence on magnet and core physics limits", "handle": "88435/dsp010v838334m", "type": "item", "link": "/rest/items/93648", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-12-10 16:51:20.361", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Menard, J.E.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-12-10T21:51:19Z", "language": null }, { "key": "dc.date.available", "value": "2018-12-10T21:51:19Z", "language": null }, { "key": "dc.date.issued", "value": "2018-12", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp010v838334m", "language": null }, { "key": "dc.description.abstract", "value": "Compact tokamak fusion reactors utilizing advanced high-temperature superconducting magnets for the toroidal field coils have received considerable recent attention due to the promise of more compact devices and more economical fusion energy development. Facilities with combined Fusion Nuclear Science (FNS) and Pilot Plant missions to provide both the nuclear environment needed to develop fusion materials and components while also potentially achieving sufficient fusion performance to generate modest net electrical power are considered. The performance of the tokamak fusion system is assessed using a range of core physics and toroidal field magnet performance constraints to better understand which parameters most strongly influence the achievable fusion performance.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Philosophical Transactions of the Royal Society A (2019)", "language": "en_US" }, { "key": "dc.subject", "value": "Pilot plant", "language": "en_US" }, { "key": "dc.subject", "value": "Fusion nuclear science", "language": "en_US" }, { "key": "dc.subject", "value": "Compact tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "High temperature superconductors", "language": "en_US" }, { "key": "dc.subject", "value": "Low aspect ratio", "language": "en_US" }, { "key": "dc.title", "value": "Compact steady-state tokamak performance dependence on magnet and core physics limits", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 91110, "name": "On the scattering correction of fast-ion D-alpha signal on NSTX-U", "handle": "88435/dsp01f4752k44n", "type": "item", "link": "/rest/items/91110", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-10-04 04:18:58.31", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Hao, G.Z", "language": null }, { "key": "dc.contributor.author", "value": "Heidbrink, W.W.", "language": null }, { "key": "dc.contributor.author", "value": "Liu, D.", "language": null }, { "key": "dc.contributor.author", "value": "Stagner, L.", "language": null }, { "key": "dc.contributor.author", "value": "Podesta, M.", "language": null }, { "key": "dc.contributor.author", "value": "Bortolon, A.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-06-27T19:46:38Z", "language": null }, { "key": "dc.date.available", "value": "2018-06-27T19:46:38Z", "language": null }, { "key": "dc.date.issued", "value": "2018-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01f4752k44n", "language": null }, { "key": "dc.description.abstract", "value": "Analysis of fast-ion D-alpha (FIDA) data on National Spherical Torus Experiment-Upgrade (NSTX-U) shows that the cold D\u03b1 line contaminates the FIDA baseline. The scattered light is comparable to the FIDA emission. A scattering correction is required to extract the FIDA signal. Two methods that relate the scattered light contamination to the intensity of the cold D\u03b1 line are employed. One method uses laboratory measurements with a calibration lamp; the other method uses data acquired during plasma operation and singular value decomposition analysis. After correction, both the FIDA spectra and spatial profile are in better agreement with theoretical predictions.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments vol. 89 p. 063507 (June 2018)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/1.5031879", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.subject", "value": "FIDA diagnostic", "language": "en_US" }, { "key": "dc.subject", "value": "Scattering correction", "language": "en_US" }, { "key": "dc.subject", "value": "Single value decomposition (SVD)", "language": "en_US" }, { "key": "dc.title", "value": "On the scattering correction of fast-ion D-alpha signal on NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 93553, "name": "Electromagnetic Particle Injector for Fast Time Response Disruption Mitigation in Tokamaks", "handle": "88435/dsp01g732dc763", "type": "item", "link": "/rest/items/93553", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-11-21 09:09:30.731", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Raman, R.", "language": null }, { "key": "dc.contributor.author", "value": "Lay, W.-S.", "language": null }, { "key": "dc.contributor.author", "value": "Jarboe, T.R.", "language": null }, { "key": "dc.contributor.author", "value": "Menard, J.E.", "language": null }, { "key": "dc.contributor.author", "value": "Ono, M.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-11-21T14:09:29Z", "language": null }, { "key": "dc.date.available", "value": "2018-11-21T14:09:29Z", "language": null }, { "key": "dc.date.issued", "value": "2018-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01g732dc763", "language": null }, { "key": "dc.description.abstract", "value": "A novel, rapid time-response, disruption mitigation system referred to as the Electromagnetic Particle Injector (EPI) is described. This method can accurately deliver the radiative payload to the plasma center on a <10 ms time scale, much faster, and deeper, than what can be achieved using conventional methods. The EPI system accelerates a sabot electromagnetically. The sabot is a metallic capsule that can be accelerated to desired velocities by an electromagnetic impeller. At the end of its acceleration, within 2 ms, the sabot will release a radiative payload, which is composed of low-z granules, or a shell pellet containing smaller pellets. The primary advantage of the EPI concept over gas propelled systems is its potential to meet short warning time scales, while accurately delivering the required particle size and materials at the velocities needed for achieving the required penetration depth in high power ITER-scale discharges for thermal and runaway current disruption mitigation. The present experimental tests from a prototype system have demonstrated the acceleration of a 3.2 g sabot to over 150 m/s within 1.5 ms, consistent with the calculations, giving some degree of confidence that larger ITER-scale injector can be developed.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion (November 2018)", "language": "en_US" }, { "key": "dc.subject", "value": "EPI", "language": "en_US" }, { "key": "dc.subject", "value": "Disruption", "language": "en_US" }, { "key": "dc.subject", "value": "Mtigation", "language": "en_US" }, { "key": "dc.subject", "value": "Fast time response", "language": "en_US" }, { "key": "dc.subject", "value": "High velocity", "language": "en_US" }, { "key": "dc.title", "value": "Electromagnetic Particle Injector for Fast Time Response Disruption Mitigation in Tokamaks", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 82819, "name": "Time dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U", "handle": "88435/dsp016969z323t", "type": "item", "link": "/rest/items/82819", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-07-19 15:38:56.449", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Munoz Burgos, J.M.", "language": null }, { "key": "dc.contributor.author", "value": "Barbui, T.", "language": null }, { "key": "dc.contributor.author", "value": "Schmitz, O.", "language": null }, { "key": "dc.contributor.author", "value": "Stutman, D.", "language": null }, { "key": "dc.contributor.author", "value": "Tritz, K.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-07-12T17:23:01Z", "language": null }, { "key": "dc.date.available", "value": "2016-07-12T17:23:01Z", "language": null }, { "key": "dc.date.issued", "value": "2016-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp016969z323t", "language": null }, { "key": "dc.description.abstract", "value": "Helium line-ratios for electron temperature (Te) and density (ne) plasma diagnostic \r\nin the Scrape-Off-Layer (SOL) and Edge regions of tokamaks are widely used. \r\nDue to their intensities and proximity of wavelengths, the singlet 667.8 and 728.1 \r\nnm, and triplet 706.5 nm visible lines have been typically preferred. Time- \r\ndependency of the triplet line (706.5 nm) has been previously analyzed in detail by \r\nincluding transient effects on line-ratios during gas-puff diagnostic applications. In this work, several line-ratio combinations within each of the two spin systems are \r\nanalyzed with the purpose of eliminating transient effects to extend the application \r\nof this powerful diagnostic to high temporal resolution characterization of \r\nplasmas. The analysis is done using synthetic emission modeling and diagnostic \r\nfor low electron density NSTX SOL plasma conditions for several visible lines. \r\nThis analysis employs both quasi-static equilibrium and time-dependent models in \r\norder to evaluate transient effects of the atomic population levels that may affect \r\nthe derived electron temperatures and densities as a helium gas-puff penetrates the \r\nplasma. Ratios between the most intense lines are usually preferred due to their \r\nhigher signal to noise ratio. The analysis of a wider range of spectral lines will \r\nhelp to extend this powerful diagnostic to experiments where the wavelength \r\nrange of the measured spectra may be constrained either by limitations of the \r\nspectrometer, or by other conflicting lines from different ions.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments Vol. 87 p. 11E502 (November 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4955286", "language": "en_US" }, { "key": "dc.subject", "value": "Scrape-Off-Layer (SOL)", "language": "en_US" }, { "key": "dc.subject", "value": "Ion Cyclotron Resonant Heating (ICRH)", "language": "en_US" }, { "key": "dc.subject", "value": "Hybrid-Time-Dependent/Independent (HTD/I)", "language": "en_US" }, { "key": "dc.title", "value": "Time dependent analysis of visible helium line-ratios for electron temperature and density diagnostic using synthetic simulations on NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 83267, "name": "Parallel electron force balance and the L-H transition", "handle": "88435/dsp01np193c633", "type": "item", "link": "/rest/items/83267", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-08-04 01:15:57.92", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Stoltzfus-Dueck, T.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-08-03T18:28:38Z", "language": null }, { "key": "dc.date.available", "value": "2016-08-03T18:28:38Z", "language": null }, { "key": "dc.date.issued", "value": "2016-05", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01np193c633", "language": null }, { "key": "dc.description.abstract", "value": "In one popular description of the L-H transition, energy transfer to the mean flows directly depletes turbulence fluctuation energy, resulting in suppression of the turbulence and a corresponding transport bifurcation. However, electron parallel force balance couples nonzonal velocity fluctuations with electron pressure fluctuations on rapid timescales, comparable with the electron transit time. For this reason, energy in the nonzonal velocity stays in a fairly fixed ratio to the free energy in electron density fluctuations, at least for frequency scales much slower than electron transit. In order for direct depletion of the energy in turbulent fluctuations to cause the L-H transition, energy transfer via Reynolds stress must therefore drain enough energy to significantly reduce the sum of the free energy in nonzonal velocities and electron pressure fluctuations. At low k, the electron thermal free energy is much larger than the energy in nonzonal velocities, posing a stark challenge for this model of the L-H transition.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "No data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas, Vol. 23, p. 054505 (May 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4951015", "language": "en_US" }, { "key": "dc.subject", "value": "L-H transition", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Reynolds stress", "language": "en_US" }, { "key": "dc.subject", "value": "Zonal flows", "language": "en_US" }, { "key": "dc.title", "value": "Parallel electron force balance and the L-H transition", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 89227, "name": "Energetic-particle-modified global Alfven eigenmodes", "handle": "88435/dsp01s1784p39h", "type": "item", "link": "/rest/items/89227", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-01-16 04:06:05.457", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Lestz, J.B.", "language": null }, { "key": "dc.contributor.author", "value": "Belova, E.V.", "language": null }, { "key": "dc.contributor.author", "value": "Gorelenkov, N.N.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-12-08T16:02:24Z", "language": null }, { "key": "dc.date.available", "value": "2017-12-08T16:02:24Z", "language": null }, { "key": "dc.date.issued", "value": "2017-12", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01s1784p39h", "language": null }, { "key": "dc.description.abstract", "value": "Fully self-consistent hybrid MHD/particle simulations reveal strong energetic particle modifications to sub-cyclotron global Alfven eigenmodes (GAE) in low-aspect ratio, NSTX-like conditions. Key parameters defining the fast ion distribution function -- the normalized injection velocity v_0/v_A and central pitch -- are varied in order to study their influence on the characteristics of the excited modes. It is found that the frequency of the most unstable mode changes significantly and continuously with beam parameters, in accordance with the Doppler-shifted cyclotron resonances which drive the modes, and depending most substantially on v_0/v_A. This unexpected result is present for both counter-propagating GAEs, which are routinely excited in NSTX, and high frequency co-GAEs, which have not been previously studied. Large changes in frequency without clear corresponding changes in mode structure could indicate the existence of a new energetic particle mode, referred to here as an energetic-particle-modified GAE (EP-GAE). Additional simulations conducted for a fixed MHD equilibrium demonstrate that the GAE frequency shift cannot be explained by the equilibrium changes due to energetic particle effects.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas (December 2017)", "language": "en_US" }, { "key": "dc.title", "value": "Energetic-particle-modified global Alfven eigenmodes", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 103939, "name": "Enhanced Pedestal H-mode at low edge ion collisionality on NSTX", "handle": "88435/dsp016h440w39j", "type": "item", "link": "/rest/items/103939", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-07-08 12:59:27.905", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Battaglia, D.J.", "language": null }, { "key": "dc.contributor.author", "value": "Guttenfelder, W.", "language": null }, { "key": "dc.contributor.author", "value": "Bell, R.E.", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "Ferraro, N.;, Fredrickson, E.", "language": null }, { "key": "dc.contributor.author", "value": "Gerhardt, S.P.", "language": null }, { "key": "dc.contributor.author", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.contributor.author", "value": "Smith, D.R.", "language": null }, { "key": "dc.date.accessioned", "value": "2020-07-08T16:59:27Z", "language": null }, { "key": "dc.date.available", "value": "2020-07-08T16:59:27Z", "language": null }, { "key": "dc.date.issued", "value": "2020-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp016h440w39j", "language": null }, { "key": "dc.description.abstract", "value": "The Enhanced Pedestal (EP) H-mode regime is an attractive wide-pedestal ELM-free high-betap scenario for NSTX-U and next-step devices as it achieves enhanced energy confinement (H98y,2 > 1.5), large normalized pressure (betaN > 5) and significant bootstrap fraction (f_BS > 0.6) at I_p/B_T = 2 MA/T. This regime is realized when the edge ion collisionality becomes sufficiently small that a positive feedback interaction occurs between a reduction in the ion neoclassical energy transport and an increase in the particle transport from pressure-driven edge instabilities. EP H-mode was most often observed as a transition following a large ELM in conditions with low edge neutral recycling. It is hypothesized that the onset of pressure-driven instabilities prior to the full recovery of the neutral density leads to a temporary period with elevated ion temperature gradient that triggers the transition to EP H-mode. Linear CGYRO and M3D-C1 calculations are compared to beam emission spectroscopy (BES) and magnetic spectroscopy in order to describe the evolution of the edge particle transport mechanisms during the ELM recovery and the saturated EP H-mode state. The observations are consistent with the hypothesis that the onset of pressure-driven edge instabilities, such as the KBM and kink-peeling, can be responsible for the increased particle transport in EP H-mode.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "spherical tokamaks", "language": "en_US" }, { "key": "dc.subject", "value": "magnetic plasma confinement", "language": "en_US" }, { "key": "dc.subject", "value": "turbulence and transport", "language": "en_US" }, { "key": "dc.subject", "value": "edge and boundary physics", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.subject", "value": "H-mode", "language": "en_US" }, { "key": "dc.title", "value": "Enhanced Pedestal H-mode at low edge ion collisionality on NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 103196, "name": "Toward fusion plasma scenario planning for NSTX-U using machine-learning-accelerated models", "handle": "88435/dsp01z316q451j", "type": "item", "link": "/rest/items/103196", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-07-08 13:00:48.964", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Mark D. Boyer", "language": null }, { "key": "dc.date.accessioned", "value": "2020-07-08T17:00:48Z", "language": null }, { "key": "dc.date.available", "value": "2020-07-08T17:00:48Z", "language": null }, { "key": "dc.date.issued", "value": "2020-05", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01z316q451j", "language": null }, { "key": "dc.description.abstract", "value": "One of the most promising devices for realizing power production through nuclear fusion is the tokamak. To maximize performance, it is preferable that tokamak reactors achieve advanced operating scenarios characterized by good plasma confinement, improved magnetohydrodynamic (MHD) stability, and a largely non-inductively driven plasma current. Such scenarios could enable steady-state reactor operation with high \\emph{fusion gain} --- the ratio of produced fusion power to the external power provided through the plasma boundary. Precise and robust control of the evolution of the plasma boundary shape as well as the spatial distribution of the plasma current, density, temperature, and rotation will be essential to achieving and maintaining such scenarios. The complexity of the evolution of tokamak plasmas, arising due to nonlinearities and coupling between various parameters, motivates the use of model-based control algorithms that can account for the system dynamics. In this work, a learning-based accelerated model trained on data from the National Spherical Torus Experiment Upgrade (NSTX-U) is employed to develop planning and control strategies for regulating the density and temperature profile evolution around desired trajectories. The proposed model combines empirical scaling laws developed across multiple devices with neural networks trained on empirical data from NSTX-U and a database of first-principles-based computationally intensive simulations. The reduced execution time of the accelerated model will enable practical application of optimization algorithms and reinforcement learning approaches for scenario planning and control development. An initial demonstration of applying optimization approaches to the learning-based model is presented, including a strategy for mitigating the effect of leaving the finite validity range of the accelerated model. The approach shows promise for actuator planning between experiments and in real-time.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Proceedings of Machine Learning Research", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.subject", "value": "machine learning", "language": "en_US" }, { "key": "dc.subject", "value": "optimization", "language": "en_US" }, { "key": "dc.subject", "value": "NUBEAM", "language": "en_US" }, { "key": "dc.subject", "value": "profile control", "language": "en_US" }, { "key": "dc.title", "value": "Toward fusion plasma scenario planning for NSTX-U using machine-learning-accelerated models", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 87628, "name": "Application of IR imaging for free-surface velocity measurement in liquid-metal systems", "handle": "88435/dsp015h73pz67t", "type": "item", "link": "/rest/items/87628", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-20 04:07:52.985", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Hvasta, M.H.", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, E.", "language": null }, { "key": "dc.contributor.author", "value": "Fisher, A.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-07-19T17:29:15Z", "language": null }, { "key": "dc.date.available", "value": "2017-07-19T17:29:15Z", "language": null }, { "key": "dc.date.issued", "value": "2017-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp015h73pz67t", "language": null }, { "key": "dc.description.abstract", "value": "Measuring free-surface, liquid-metal flow velocity is challenging to do in a reliable and accurate manner. This paper presents a non-invasive, easily-calibrated method of measuring the surface velocities of open-channel liquid-metal flows using an IR camera. Unlike other spatially-limited methods, this IR camera particle tracking technique provides full field-of-view data that can be used to better understand open-channel flows and determine surface boundary conditions. This method could be implemented and automated for a wide range of liquid-metal experiments, even if they operate at high-temperatures or within strong magnetic fields.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments vol. 88 p. 013501 (January 2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4973421", "language": "en_US" }, { "key": "dc.subject", "value": "Liquid metal", "language": "en_US" }, { "key": "dc.subject", "value": "Free surface", "language": "en_US" }, { "key": "dc.subject", "value": "IR camera", "language": "en_US" }, { "key": "dc.subject", "value": "Velocimetry", "language": "en_US" }, { "key": "dc.title", "value": "Application of IR imaging for free-surface velocity measurement in liquid-metal systems", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 95311, "name": "Global modeling of wall material migration following boronization in NSTX-U", "handle": "88435/dsp01np193c96x", "type": "item", "link": "/rest/items/95311", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-03-20 08:38:31.997", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Nichols, J.H.", "language": null }, { "key": "dc.contributor.author", "value": "Jaworski, M.A.", "language": null }, { "key": "dc.contributor.author", "value": "Skinner, C.H.", "language": null }, { "key": "dc.contributor.author", "value": "Bedoya, F.", "language": null }, { "key": "dc.contributor.author", "value": "Scotti, F.", "language": null }, { "key": "dc.contributor.author", "value": "Soukhanovskii, V.A.", "language": null }, { "key": "dc.contributor.author", "value": "Schmid, K.", "language": null }, { "key": "dc.date.accessioned", "value": "2019-03-20T12:38:30Z", "language": null }, { "key": "dc.date.available", "value": "2019-03-20T12:38:30Z", "language": null }, { "key": "dc.date.issued", "value": "2019-03", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01np193c96x", "language": null }, { "key": "dc.description.abstract", "value": "Boronization is commonly utilized in tokamaks to suppress intrinsic impurities, most notably oxygen from residual water vapor. However, this is a temporary solution, as oxygen levels typically return to pre-boronization levels following repeated plasma exposure. The global impurity migration model WallDYN has been applied to the post-boronization surface impurity evolution in NSTX-U. A \u201cThin Film Model\u201d has been incorporated into WallDYN to handle spatially inhomogeneous conditioning films of varying thicknesses, together with an empirical boron conditioning model for the NSTX-U glow discharge boronization process. The model qualitatively reproduces the spatial distribution of boron in the NSTX-U vessel, the spatially-resolved divertor emission pattern, and the increase in oxygen levels following boronization. The simulations suggest that oxygen is primarily sourced from wall locations without heavy plasma flux or significant boron deposition, namely the lower and upper passive plates and the lower private flux zone.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and dataf files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Materials and Energy (March 2019)", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.subject", "value": "Boronization", "language": "en_US" }, { "key": "dc.subject", "value": "Boron", "language": "en_US" }, { "key": "dc.subject", "value": "Oxygen", "language": "en_US" }, { "key": "dc.subject", "value": "Impurities", "language": "en_US" }, { "key": "dc.subject", "value": "Migration", "language": "en_US" }, { "key": "dc.subject", "value": "WALLDYN", "language": "en_US" }, { "key": "dc.subject", "value": "Erosion", "language": "en_US" }, { "key": "dc.subject", "value": "Integrated modeling", "language": "en_US" }, { "key": "dc.title", "value": "Global modeling of wall material migration following boronization in NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 83247, "name": "Three New Extreme Ultraviolet Spectrometers on NSTX-U for Impurity Monitoring", "handle": "88435/dsp01f4752k20s", "type": "item", "link": "/rest/items/83247", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-11-14 12:02:04.125", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Weller, M.E.", "language": null }, { "key": "dc.contributor.author", "value": "Beiersdorfer, P.", "language": null }, { "key": "dc.contributor.author", "value": "Soukhanovskii, V.", "language": null }, { "key": "dc.contributor.author", "value": "Magee, E.W.", "language": null }, { "key": "dc.contributor.author", "value": "Scotti, F.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-08-02T18:50:24Z", "language": null }, { "key": "dc.date.available", "value": "2016-08-02T18:50:24Z", "language": null }, { "key": "dc.date.issued", "value": "2016-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01f4752k20s", "language": null }, { "key": "dc.description.abstract", "value": "Three extreme ultraviolet (EUV) spectrometers have been mounted on the National Spherical Torus Experiment-Upgrade (NSTX-U). All three are flat-field grazing-incidence spectrometers and are dubbed X-ray and Extreme Ultraviolet Spectrometer (8 \u00f1 70 \u2248), Long-Wavelength Extreme Ultraviolet Spectrometer (190 \u00f1 440 \u2248), and Metal Monitor and Lithium Spectrometer Assembly (MonaLisa, 50 \u00f1 220 \u2248). XEUS and LoWEUS were previously implemented on NSTX to monitor impurities from low- to high-Z sources and to study impurity transport while MonaLisa is new and provides the system increased spectral coverage. The spectrometers will also be a critical diagnostic on the planned laser blow-off (LBO) system for NSTX-U, which will be used for impurity edge and core ion transport studies, edge-transport code development, and benchmarking atomic physics codes.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments, vol. 87, p. 11E324 (November 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4960755", "language": null }, { "key": "dc.subject", "value": "Spectroscopy", "language": "en_US" }, { "key": "dc.subject", "value": "Extreme ultraviolet", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.subject", "value": "Impurity monitoring", "language": "en_US" }, { "key": "dc.subject", "value": "XEUS", "language": "en_US" }, { "key": "dc.subject", "value": "MonaLisa", "language": "en_US" }, { "key": "dc.subject", "value": "LoWEUS", "language": "en_US" }, { "key": "dc.title", "value": "Three New Extreme Ultraviolet Spectrometers on NSTX-U for Impurity Monitoring", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 87752, "name": "Gas Puff Imaging Diagnostics of Edge Plasma Turbulence in Magnetic Fusion Devices", "handle": "88435/dsp01xg94hs15v", "type": "item", "link": "/rest/items/87752", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-21 04:06:52.741", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zweben, S.J.", "language": null }, { "key": "dc.contributor.author", "value": "Terry, J.L.", "language": null }, { "key": "dc.contributor.author", "value": "Stotler, D.P.", "language": null }, { "key": "dc.contributor.author", "value": "Maqueda, R.J.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-07-20T14:23:07Z", "language": null }, { "key": "dc.date.available", "value": "2017-07-20T14:23:07Z", "language": null }, { "key": "dc.date.issued", "value": "2017-04", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01xg94hs15v", "language": null }, { "key": "dc.description.abstract", "value": "Gas puff imaging (GPI) is a diagnostic of plasma turbulence which uses\r\na puff of neutral gas at the plasma edge to increase the local visible\r\nlight emission for improved space-time resolution of plasma\r\nfluctuations. This paper reviews gas puff imaging diagnostics of edge\r\nplasma turbulence in magnetic fusion research, with a focus on the\r\ninstrumentation, diagnostic cross-checks, and interpretation\r\nissues. The gas puff imaging hardware, optics, and detectors are\r\ndescribed for about 10 GPI systems implemented over the past ~15\r\nyears. Comparison of GPI results with other edge turbulence diagnostic\r\nresults are described and many common features are observed. Several\r\nissues in the interpretation of GPI measurements are discussed, and\r\npotential improvements in hardware and modeling are suggested.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments, vol. 88, P. 041101 (April 2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4981873", "language": "en_US" }, { "key": "dc.subject", "value": "Gas puff imaging", "language": "en_US" }, { "key": "dc.title", "value": "Gas Puff Imaging Diagnostics of Edge Plasma Turbulence in Magnetic Fusion Devices", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 87753, "name": "Neutral recycling effects on ITG turbulence", "handle": "88435/dsp011831cn576", "type": "item", "link": "/rest/items/87753", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-21 04:06:53.417", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Stotler, D.P.", "language": null }, { "key": "dc.contributor.author", "value": "Lang, J.", "language": null }, { "key": "dc.contributor.author", "value": "Chang, C.S.", "language": null }, { "key": "dc.contributor.author", "value": "Churchill, R.M.", "language": null }, { "key": "dc.contributor.author", "value": "Ku, S.-H.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-07-20T14:44:16Z", "language": null }, { "key": "dc.date.available", "value": "2017-07-20T14:44:16Z", "language": null }, { "key": "dc.date.issued", "value": "2017-08", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp011831cn576", "language": null }, { "key": "dc.description.abstract", "value": "The effects of recycled neutral atoms on tokamak ion temperature\r\ngradient (ITG) driven turbulence have been investigated in a steep\r\nedge pedestal, magnetic separatrix configuration, with the full-f\r\nedge gryokinetic code XGC1. Ion temperature gradient turbulence is\r\nthe most fundamental and robust edge plasma instability, having a long\r\nradial correlation length and an ability to impact other forms of\r\npedestal turbulence. The neutral atoms enhance the ITG turbulence,\r\nfirst, by increasing the ion temperature gradient in the pedestal via\r\nthe cooling effects of charge exchange and, second, by a relative\r\nreduction in the ExB shearing rate.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion, vol. 57, p. 086028 (August 2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/aa7807", "language": "en_US" }, { "key": "dc.subject", "value": "Gyrokinetic simulation", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma turbulence", "language": "en_US" }, { "key": "dc.subject", "value": "Neutral recycling", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamak", "language": "en_US" }, { "key": "dc.title", "value": "Neutral recycling effects on ITG turbulence", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 85008, "name": "Design of Faraday cup ion detectors built by thin film deposition", "handle": "88435/dsp016108vd746", "type": "item", "link": "/rest/items/85008", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-01-10 01:11:03.854", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Szalkowski, G.A.", "language": null }, { "key": "dc.contributor.author", "value": "Darrow, D.S.", "language": null }, { "key": "dc.contributor.author", "value": "Cecil, F.E.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-01-09T20:20:23Z", "language": null }, { "key": "dc.date.available", "value": "2017-01-09T20:20:23Z", "language": null }, { "key": "dc.date.issued", "value": "2017-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp016108vd746", "language": null }, { "key": "dc.description.abstract", "value": "Thin film Faraday cup detectors can provide measurements of fast ion loss from magnetically confined fusion plasmas. These multilayer detectors can resolve the energy distribution of the lost ions in addition to giving the total loss rate. Prior detectors were assembled from discrete foils and insulating sheets. Outlined here is a design methodology for creating detectors using thin film deposition that are suited to particular scientific goals. The intention is to use detectors created by this method on JET and NSTX-U. The detectors will consist of alternating layers of aluminum and silicon dioxide, with layer thicknesses chosen to isolate energies of interest. Thin film deposition offers the advantage of relatively simple and more mechanically robust construction compared to other methods, as well as allowing precise control of film thickness. Furthermore, this depositional fabrication technique places the layers in intimate thermal contact, providing for three-dimensional conduction and dissipation of the ion-produced heating in the layers, rather than the essentially two-dimensional heat conduction in the discrete foil stack implementation.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Instrumentation and Methods in Physics A, 2017", "language": "en_US" }, { "key": "dc.subject", "value": "Fast ion loss", "language": "en_US" }, { "key": "dc.subject", "value": "Faraday cups", "language": "en_US" }, { "key": "dc.subject", "value": "Thin films", "language": "en_US" }, { "key": "dc.title", "value": "Design of Faraday cup ion detectors built by thin film deposition", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 95391, "name": "Study of liquid metal surface wave damping in the presence of magnetic fields and electrical currents", "handle": "88435/dsp01s7526g206", "type": "item", "link": "/rest/items/95391", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-03-29 13:40:53.986", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Fisher, A.E.", "language": null }, { "key": "dc.contributor.author", "value": "Hvasta, M.G.; Kolemen, E.", "language": null }, { "key": "dc.date.accessioned", "value": "2019-03-28T14:34:49Z", "language": null }, { "key": "dc.date.available", "value": "2019-03-28T14:34:49Z", "language": null }, { "key": "dc.date.issued", "value": "2019-03", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01s7526g206", "language": null }, { "key": "dc.description.abstract", "value": "Experiments and predictions of surface wave damping in liquid metal due to a surface aligned magnetic field and externally regulated j \u00d7 B force are presented. Fast-flowing, liquid-metal plasma facing components (LM-PFCs) are a proposed alternative to solid PFCs that are unable to handle the high heat flux, thermal stresses, and radiation damage in a tokamak. The significant technical challenges associated with LM-PFCs compared to solid PFCs are justified by greater heat flux management, self-healing properties, and reduced particle recycling. However, undesirable engineering challenges such as evaporation and splashing of the liquid metal introduce excessive impurities into the plasma and degrade plasma performance. Evaporation may be avoided through high-speed flow that limits temperature rise of the liquid metal by reducing heat flux exposure time, but as flow speed increases the surface may become more turbulent and prone to splashing and uneven surfaces. Wave damping is one mechanism that reduces surface disturbance and thus the chances of liquid metal impurity introduction into the plasma. Experiments on the Liquid Metal eXperiment Upgrade (LMX-U) examined damping under the influence of transverse magnetic fields and vertically directed Lorentz force.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "NUCLEAR MATERIALS AND ENERGY 19 101 (March 2019)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1016/j.nme.2019.02.014", "language": null }, { "key": "dc.subject", "value": "Liquid metal", "language": "en_US" }, { "key": "dc.subject", "value": "Lorentz force", "language": "en_US" }, { "key": "dc.subject", "value": "Surface waves", "language": "en_US" }, { "key": "dc.title", "value": "Study of liquid metal surface wave damping in the presence of magnetic fields and electrical currents", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 95392, "name": "A scalable real-time framework for Thomson scattering analysis: Application to NSTX-U", "handle": "88435/dsp01nk322h13s", "type": "item", "link": "/rest/items/95392", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-03-29 04:10:51.111", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "F. M. Laggner, A. Diallo, B. P. LeBlanc, R. Rozenblat, G. Tchilinguirian, E.Kolemen, the NSTX-U team", "language": null }, { "key": "dc.date.accessioned", "value": "2019-03-28T14:35:35Z", "language": null }, { "key": "dc.date.available", "value": "2019-03-28T14:35:35Z", "language": null }, { "key": "dc.date.issued", "value": "2019-03", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01nk322h13s", "language": null }, { "key": "dc.description.abstract", "value": "A detailed description of a prototype setup for real-time (rt) Thomson scattering (TS) analysis is presented and implemented in the multi-point Thomson scattering (MPTS) diagnostic system at the National Spherical Torus Experiment Upgrade(NSTX-U). The data acquisition hardware was upgraded with rt capable electronics (rt-analog digital converters (ADCs) and a rt server) that allow for fast digitization of the laser pulse signal of eight radial MPTS channels. In addition, a new TS spectrum analysis software for a rapid calculation of electron temperature (Te) and electron density (ne) was developed. Testing of the rt hardware and data analysis soft-ware was successfully completed and benchmarked against the standard, post-shot evaluation. Timing tests were performed showing that the end-to-end processing time was reproducibly below 17 ms for the duration of at least 5 s, meeting a 60 Hz deadline by the laser pulse repetition rate over the length of a NSTX-U discharge. The presented rt framework is designed to be scalable in system size, i.e. incorporation of additional radial channels by solely adding additional rt capable hardware. Furthermore, it is scalable in its operation duration and was continuously run for up to 30 min, making it an attractive solution for machines with long discharge duration such as advanced, non-inductive tokamaks or stellarators.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma, Tokamak, Diagnostic, Thomson scattering, real time, Electron Temperature, Electron Density", "language": "en_US" }, { "key": "dc.title", "value": "A scalable real-time framework for Thomson scattering analysis: Application to NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 95492, "name": "TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade", "handle": "88435/dsp01v405sd16b", "type": "item", "link": "/rest/items/95492", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-03-29 13:41:54.778", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Ilhan, Z.O.", "language": null }, { "key": "dc.contributor.author", "value": "Boyer. M.D.", "language": null }, { "key": "dc.contributor.author", "value": "Schuster, E.", "language": null }, { "key": "dc.date.accessioned", "value": "2019-03-28T23:37:31Z", "language": null }, { "key": "dc.date.available", "value": "2019-03-28T23:37:31Z", "language": null }, { "key": "dc.date.issued", "value": "2019-03", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01v405sd16b", "language": null }, { "key": "dc.description.abstract", "value": "Active control of the toroidal current density profile is critical for the upgraded National Spherical Torus eXperiment device (NSTX-U) to maintain operation at the desired high-performance, MHD-stable, plasma regime. Initial efforts towards current density profile control have led to the development of a control-oriented, physics-based, plasma-response model, which combines the magnetic diffusion equation with empirical correlations for the kinetic profiles and the non-inductive current sources. The developed control-oriented model has been successfully tailored to the NSTX-U geometry and actuators. Moreover, a series of efforts have been made towards the design of model-based controllers, including a linear-quadratic-integral optimal control strategy that can regulate the current density profile around a prescribed target profile while rejecting disturbances. In this work, the tracking performance of the proposed current-profile optimal controller is tested in numerical simulations based on the physics-oriented code TRANSP. These high-fidelity closed-loop simulations, which are a critical step before experimental implementation and testing, are enabled by a flexible framework recently\r\ndeveloped to perform feedback control design and simulation in TRANSP.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Fusion Engineering and Design", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1016/j.fusengdes.2019.01.021", "language": null }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.subject", "value": "plasma control", "language": "en_US" }, { "key": "dc.subject", "value": "current profile control", "language": "en_US" }, { "key": "dc.title", "value": "TRANSP-based closed-loop simulations of current profile optimal regulation in NSTX-Upgrade", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 86078, "name": "M3D-C1 simulations of the plasma response to RMPs in NSTX-U single-null and snowflake divertor configurations", "handle": "88435/dsp01ms35tc13d", "type": "item", "link": "/rest/items/86078", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-19 12:58:11.184", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Canal, G.P.", "language": null }, { "key": "dc.contributor.author", "value": "Ferraro, N.M.", "language": null }, { "key": "dc.contributor.author", "value": "Evans, T.E.", "language": null }, { "key": "dc.contributor.author", "value": "Osborne, T.H.", "language": null }, { "key": "dc.contributor.author", "value": "Menard, J.E.", "language": null }, { "key": "dc.contributor.author", "value": "Ahn, J.-W.", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.contributor.author", "value": "Wingen, A.", "language": null }, { "key": "dc.contributor.author", "value": "Ciro, D.", "language": null }, { "key": "dc.contributor.author", "value": "Frerichs, H.", "language": null }, { "key": "dc.contributor.author", "value": "Schmitz, O.", "language": null }, { "key": "dc.contributor.author", "value": "Soukhanovskii, V.", "language": null }, { "key": "dc.contributor.author", "value": "Waters, I.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-04-28T15:12:07Z", "language": null }, { "key": "dc.date.available", "value": "2017-04-28T15:12:07Z", "language": null }, { "key": "dc.date.issued", "value": "2017-07", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01ms35tc13d", "language": null }, { "key": "dc.description.abstract", "value": "Non-axisymmetric control coils and the so-called snowflake divertor configuration are two potential solutions proposed to solve two separate outstanding issues on the path towards self-sustained burning plasma operations, namely the transient energy bursts caused by edge localized modes and the steady state heat exhaust problem. In a reactor, these two proposed solutions would have to operate simultaneously and it is, therefore, important to investigate their compatibility and to identify possible conflicts that could prevent them from operating simultaneously. In this work, single- and two-fluid resistive magnetohydrodynamic calculations are used to investigate the effect of externally applied magnetic perturbations on the snowflake divertor configuration. The calculations are based on simulated NSTX-U plasmas and the results show that additional and longer magnetic lobes are created in the null-point region of the snowflake configuration, compared to those in the conventional single-null. The intersection of these longer and additional lobes with the divertor plates are expected to cause more striations in the particle and heat flux target profiles. In addition, the results indicate that the size of the magnetic lobes, in both single-null and snowflake configurations, are more sensitive to resonant magnetic perturbations than to non-resonant magnetic perturbations. The results also suggest that lower values of current in non-axisymmetric control coils would be required to suppress edge localized modes in plasmas with the snowflake configuration.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion (2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://doi.org/10.1066/1741-4326/aa6a10", "language": null }, { "key": "dc.subject", "value": "Snowflake divertor", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma response", "language": "en_US" }, { "key": "dc.subject", "value": "Two fluid MHD", "language": "en_US" }, { "key": "dc.subject", "value": "Nonaxisymmetric perturbations", "language": "en_US" }, { "key": "dc.title", "value": "M3D-C1 simulations of the plasma response to RMPs in NSTX-U single-null and snowflake divertor configurations", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 85016, "name": "Advances in boronization on NSTX-Upgrade", "handle": "88435/dsp018s45qc26p", "type": "item", "link": "/rest/items/85016", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-01-12 01:15:37.89", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Skinner, C.H.", "language": null }, { "key": "dc.contributor.author", "value": "Bedoya, F.", "language": null }, { "key": "dc.contributor.author", "value": "Scotti, F.", "language": null }, { "key": "dc.contributor.author", "value": "Allain, J.P.", "language": null }, { "key": "dc.contributor.author", "value": "Blanchard, W.", "language": null }, { "key": "dc.contributor.author", "value": "Cai, D.", "language": null }, { "key": "dc.contributor.author", "value": "Jaworski, M.", "language": null }, { "key": "dc.contributor.author", "value": "Koel, B.E.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-01-11T21:37:59Z", "language": null }, { "key": "dc.date.available", "value": "2017-01-11T21:37:59Z", "language": null }, { "key": "dc.date.issued", "value": "2017-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp018s45qc26p", "language": null }, { "key": "dc.description.abstract", "value": "Boronization has been effective in reducing plasma impurities and enabling access to higher density, higher confinement plasmas in many magnetic fusion devices. The National Spherical Torus eXperiment, NSTX, has recently undergone a major upgrade to NSTX-U in order to develop the physics basis for a ST-based Fusion Nuclear Science Facility (FNSF) with capability for double the toroidal field, plasma current, and NBI heating power and increased pulse duration from 1\u20131.5 s to 5\u20138 s. A new deuterated tri-methyl boron conditioning system was implemented together with a novel surface analysis diagnostic. We report on the spatial distribution of the boron deposition versus discharge pressure, gas injection and electrode location. The oxygen concentration of the plasma facing surface was measured by in-vacuo XPS and increased both with plasma exposure and with exposure to trace residual gases. This increase correlated with the rise of oxygen emission from the plasma.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Readme, Digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "J. Nucl. Mater. and Energy", "language": "en_US" }, { "key": "dc.subject", "value": "Boronization", "language": "en_US" }, { "key": "dc.subject", "value": "Deuterated tri-methyl boron", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma-materials interaction", "language": "en_US" }, { "key": "dc.subject", "value": "Surface analysis", "language": "en_US" }, { "key": "dc.title", "value": "Advances in boronization on NSTX-Upgrade", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 85487, "name": "Overview of NSTX Upgrade Initial Results and Modelling Highlights", "handle": "88435/dsp016w924f316", "type": "item", "link": "/rest/items/85487", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-19 12:18:42.713", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Menard, J.E.", "language": null }, { "key": "dc.contributor.author", "value": "Allain, J.P.", "language": null }, { "key": "dc.contributor.author", "value": "Battaglia, D.J.", "language": null }, { "key": "dc.contributor.author", "value": "Bedoya, F.", "language": null }, { "key": "dc.contributor.author", "value": "Bell, R.E.", "language": null }, { "key": "dc.contributor.author", "value": "Belova, E.", "language": null }, { "key": "dc.contributor.author", "value": "Berkery, J.W.", "language": null }, { "key": "dc.contributor.author", "value": "Boyer, M.D.", "language": null }, { "key": "dc.contributor.author", "value": "Crocker, N.", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "Ebrahimi, F.", "language": null }, { "key": "dc.contributor.author", "value": "Ferrraro, N.", "language": null }, { "key": "dc.contributor.author", "value": "Fredrickson, E.", "language": null }, { "key": "dc.contributor.author", "value": "Frerichs, H.", "language": null }, { "key": "dc.contributor.author", "value": "Gerhardt, S.", "language": null }, { "key": "dc.contributor.author", "value": "Gorelenkov, N.", "language": null }, { "key": "dc.contributor.author", "value": "Guttenfelder, W.", "language": null }, { "key": "dc.contributor.author", "value": "Heidbrink, W.", "language": null }, { "key": "dc.contributor.author", "value": "Kaita, R.", "language": null }, { "key": "dc.contributor.author", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.author", "value": "Kriete, D.M.", "language": null }, { "key": "dc.contributor.author", "value": "Kubota, S.", "language": null }, { "key": "dc.contributor.author", "value": "LeBlanc, B.P.", "language": null }, { "key": "dc.contributor.author", "value": "Liu, D.", "language": null }, { "key": "dc.contributor.author", "value": "Lunsford, R.", "language": null }, { "key": "dc.contributor.author", "value": "Mueller, D.", "language": null }, { "key": "dc.contributor.author", "value": "Myers, C.E.", "language": null }, { "key": "dc.contributor.author", "value": "Ono, M.", "language": null }, { "key": "dc.contributor.author", "value": "Park, J.-K.", "language": null }, { "key": "dc.contributor.author", "value": "Podesta, M.", "language": null }, { "key": "dc.contributor.author", "value": "Raman, R.", "language": null }, { "key": "dc.contributor.author", "value": "Reinke, M.", "language": null }, { "key": "dc.contributor.author", "value": "Ren, Y.", "language": null }, { "key": "dc.contributor.author", "value": "Sabbagh, S.A.", "language": null }, { "key": "dc.contributor.author", "value": "Schmitz, O.", "language": null }, { "key": "dc.contributor.author", "value": "Scotti, F.", "language": null }, { "key": "dc.contributor.author", "value": "Sechrest, Y.", "language": null }, { "key": "dc.contributor.author", "value": "Skinner, C.H.", "language": null }, { "key": "dc.contributor.author", "value": "Smith, D.R.", "language": null }, { "key": "dc.contributor.author", "value": "Soukhanovskii, V.", "language": null }, { "key": "dc.contributor.author", "value": "Stoltzfus-Dueck, T.", "language": null }, { "key": "dc.contributor.author", "value": "Yuh, H.", "language": null }, { "key": "dc.contributor.author", "value": "Wang, Z.", "language": null }, { "key": "dc.contributor.author", "value": "Waters, I.", "language": null }, { "key": "dc.contributor.author", "value": "Ahn, J.-W.", "language": null }, { "key": "dc.contributor.author", "value": "Andre, R.", "language": null }, { "key": "dc.contributor.author", "value": "Barchfeld, R.", "language": null }, { "key": "dc.contributor.author", "value": "Beiersdorfer, P.", "language": null }, { "key": "dc.contributor.author", "value": "Bertelli, N.", "language": null }, { "key": "dc.contributor.author", "value": "Bhattacharjee, A.", "language": null }, { "key": "dc.contributor.author", "value": "Boyle, D.", "language": null }, { "key": "dc.contributor.author", "value": "Brennan, D.", "language": null }, { "key": "dc.contributor.author", "value": "Buttery, R.", "language": null }, { "key": "dc.contributor.author", "value": "Capece, A.", "language": null }, { "key": "dc.contributor.author", "value": "Canal, G.", "language": null }, { "key": "dc.contributor.author", "value": "Canik, J.", "language": null }, { "key": "dc.contributor.author", "value": "Chang, C.S.", "language": null }, { "key": "dc.contributor.author", "value": "Darrow, D.", "language": null }, { "key": "dc.contributor.author", "value": "Delgado-Aparicio, L.", "language": null }, { "key": "dc.contributor.author", "value": "Domier, C.", "language": null }, { "key": "dc.contributor.author", "value": "Ethier, S.", "language": null }, { "key": "dc.contributor.author", "value": "Evans, T.", "language": null }, { "key": "dc.contributor.author", "value": "Ferron, J.", "language": null }, { "key": "dc.contributor.author", "value": "Finkenthal, M.", "language": null }, { "key": "dc.contributor.author", "value": "Fonck, R.", "language": null }, { "key": "dc.contributor.author", "value": "Gan, K.", "language": null }, { "key": "dc.contributor.author", "value": "Gates, D.", "language": null }, { "key": "dc.contributor.author", "value": "Goumiri, I.", "language": null }, { "key": "dc.contributor.author", "value": "Gray, T.", "language": null }, { "key": "dc.contributor.author", "value": "Hosea, J.", "language": null }, { "key": "dc.contributor.author", "value": "Humphreys, D.", "language": null }, { "key": "dc.contributor.author", "value": "Jarboe, T.", "language": null }, { "key": "dc.contributor.author", "value": "Jardin, S.", "language": null }, { "key": "dc.contributor.author", "value": "Jaworski, M.A.", "language": null }, { "key": "dc.contributor.author", "value": "Koel, B.", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, E.", "language": null }, { "key": "dc.contributor.author", "value": "Ku, S.", "language": null }, { "key": "dc.contributor.author", "value": "LaHaye, R.J.", "language": null }, { "key": "dc.contributor.author", "value": "Levinton, F.", "language": null }, { "key": "dc.contributor.author", "value": "Luhmann Jr., N.", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.contributor.author", "value": "Maqueda, R.", "language": null }, { "key": "dc.contributor.author", "value": "McKee, G.", "language": null }, { "key": "dc.contributor.author", "value": "Meier, E.", "language": null }, { "key": "dc.contributor.author", "value": "Myra, J.", "language": null }, { "key": "dc.contributor.author", "value": "Perkins, R.", "language": null }, { "key": "dc.contributor.author", "value": "Poli, F.", "language": null }, { "key": "dc.contributor.author", "value": "Rhodes, T.", "language": null }, { "key": "dc.contributor.author", "value": "Riquezes, J.", "language": null }, { "key": "dc.contributor.author", "value": "Rowley, C.", "language": null }, { "key": "dc.contributor.author", "value": "Russell, D.", "language": null }, { "key": "dc.contributor.author", "value": "Schuster, E.", "language": null }, { "key": "dc.contributor.author", "value": "Stratton, B.", "language": null }, { "key": "dc.contributor.author", "value": "Stutman, D.", "language": null }, { "key": "dc.contributor.author", "value": "Taylor, G.", "language": null }, { "key": "dc.contributor.author", "value": "Tritz, K.", "language": null }, { "key": "dc.contributor.author", "value": "Wang, W.", "language": null }, { "key": "dc.contributor.author", "value": "Wirth, B.", "language": null }, { "key": "dc.contributor.author", "value": "Zweben, S.J.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-03-01T15:15:38Z", "language": null }, { "key": "dc.date.available", "value": "2017-03-01T15:15:38Z", "language": null }, { "key": "dc.date.issued", "value": "2017-10", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp016w924f316", "language": null }, { "key": "dc.description.abstract", "value": "The National Spherical Torus Experiment (NSTX) has undergone a major upgrade, and the NSTX Upgrade (NSTX-U) Project was completed in the summer of 2015. NSTX-U first plasma was subsequently achieved, diagnostic and control systems have been commissioned, H-Mode accessed, magnetic error fields identified and mitigated, and the first physics research campaign carried out. During 10 run weeks of operation, NSTX-U surpassed NSTX-record pulse-durations and toroidal fields, and high-performance ~1MA H-mode plasmas comparable to the best of NSTX have been sustained near and slightly above the n=1 no-wall stability limit and with H-mode confinement multiplier H98y2 above 1. Transport and turbulence studies in L-mode plasmas have identified the coexistence of at least two ion-gyro-scale turbulent micro-instabilities near the same radial location but propagating in opposite (i.e. ion and electron diamagnetic) directions. These modes have the characteristics of ion-temperature gradient and micro-tearing modes, respectively, and the role of these modes in contributing to thermal transport is under active investigation. The new second more tangential neutral beam injection was observed to significantly modify the stability of two types of Alfven Eigenmodes. Improvements in offline disruption forecasting were made in the areas of identification of rotating MHD modes and other macroscopic instabilities using the Disruption Event Characterization and Forecasting (DECAF) code. Lastly, the Materials Analysis and Particle Probe (MAPP) was utilized on NSTX-U for the first time and enabled assessments of the correlation between boronized wall conditions and plasma performance. These and other highlights from the first run campaign of NSTX-U are described.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion vol. 57 p. 102006 (October 2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://doi.org/10.1066/1741-4326/aa600a", "language": null }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.subject", "value": "Spherical tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Alfven Eigenmodes", "language": "en_US" }, { "key": "dc.title", "value": "Overview of NSTX Upgrade Initial Results and Modelling Highlights", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 85007, "name": "Optimization of the angular orientation for a fast ion loss detector in a tokamak", "handle": "88435/dsp019s161866v", "type": "item", "link": "/rest/items/85007", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-01-10 01:11:04.954", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Darrow, D.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-01-09T20:20:11Z", "language": null }, { "key": "dc.date.available", "value": "2017-01-09T20:20:11Z", "language": null }, { "key": "dc.date.issued", "value": "2017-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp019s161866v", "language": null }, { "key": "dc.description.abstract", "value": "A scintillator type fast ion loss detector measures the gyroradius and pitch angle distribution of superthermal ions escaping from a magnetically confined fusion plasma at a single location. Described here is a technique for optimizing the angular orientation of such a detector in an axisymmetric tokamak geometry in order to intercept losses over a useful and interesting ranges of pitch angle. The method consists of evaluating the detector acceptance as a function of the fast ion constants of motion, i.e. energy, canonical toroidal momentum, and magnetic moment. The detector acceptance can then be plotted in a plane of constant energy and compared with the relevant orbit class boundaries and fast ion source distributions. Knowledge of expected or interesting mechanisms of loss can further guide selection of the detector orientation. The example of a fast ion loss detector for the National Spherical Torus Experiment-Upgrade (NSTX-U) is considered.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Readme and data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Fusion Science and Technology, 2017", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Fast ion loss", "language": "en_US" }, { "key": "dc.subject", "value": "Particle phase space", "language": "en_US" }, { "key": "dc.title", "value": "Optimization of the angular orientation for a fast ion loss detector in a tokamak", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 97071, "name": "Modelling of Ablatant Deposition from Electromagnetically Driven Radiative Pellets for Disruption Mitigation Studies", "handle": "88435/dsp018910jx38x", "type": "item", "link": "/rest/items/97071", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-06-13 05:29:55.216", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Lunsford, Robert", "language": null }, { "key": "dc.contributor.author", "value": "Raman, Roger", "language": null }, { "key": "dc.contributor.author", "value": "Brooks, Arthur", "language": null }, { "key": "dc.contributor.author", "value": "Ellis, Robert A.", "language": null }, { "key": "dc.contributor.author", "value": "Lay, W-S;", "language": null }, { "key": "dc.date.accessioned", "value": "2019-06-12T19:06:07Z", "language": null }, { "key": "dc.date.available", "value": "2019-06-12T19:06:07Z", "language": null }, { "key": "dc.date.issued", "value": "2019-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp018910jx38x", "language": null }, { "key": "dc.description.abstract", "value": "The Electromagnetic Particle Injector (EPI) concept is advanced through the simulation of ablatant deposition into ITER H-mode discharges with calculations showing penetration past the H-mode pedestal for a range of injection velocities and granule sizes concurrent with the requirements of disruption mitigation. As discharge stored energy increases in future fusion devices such as ITER, control and handling of disruption events becomes a critical issue. An unmitigated disruption could lead to failure of the plasma facing components resulting in financially and politically costly repairs. Methods to facilitate the quench of an unstable high current discharge are required. With the onset warning time for some ITER disruption events estimated to be less than 10 ms, a disruption mitigation system needs to be considered which operates at injection speeds greater than gaseous sound speeds. Such an actuator could then serve as a means to augment presently planned pneumatic injection systems. The EPI uses a rail gun concept whereby a radiative payload is delivered into the discharge by means of the JxB forces generated by an external current pulse, allowing for injection velocities in excess of 1 km/s. The present status of the EPI project is outlined, including the addition of boost magnetic coils. These coils augment the self-generated rail gun magnetic field and thus provide a more efficient acceleration of the payload. The coils and the holder designed to constrain them have been modelled with the ANSYS code to ensure structural integrity through the range of operational coil cu", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Fusion Science and Technology", "language": "en_US" }, { "key": "dc.subject", "value": "Electromagnetic Particle Injector", "language": "en_US" }, { "key": "dc.subject", "value": "rail gun", "language": "en_US" }, { "key": "dc.subject", "value": "ITER", "language": "en_US" }, { "key": "dc.subject", "value": "disruption", "language": "en_US" }, { "key": "dc.title", "value": "Modelling of Ablatant Deposition from Electromagnetically Driven Radiative Pellets for Disruption Mitigation Studies", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 91151, "name": "Modeling of a Laser-Induced Rydberg Spectroscopy diagnostic for Direct Measurement of the Local Electric Field in the Edge Region of NSTX/NSTX-U", "handle": "88435/dsp01c247dv80k", "type": "item", "link": "/rest/items/91151", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-07-07 04:06:07.963", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Reymond, L.", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "Vekselman, V.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-07-06T17:34:08Z", "language": null }, { "key": "dc.date.available", "value": "2018-07-06T17:34:08Z", "language": null }, { "key": "dc.date.issued", "value": "2018-07", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01c247dv80k", "language": null }, { "key": "dc.description.abstract", "value": "We discuss a novel diagnostic allowing direct measurements of the local electric field in the edge region in NSTX/NSTX-U. This laser based diagnostic's principle consists of depleting the naturally populated $n=3$ level to a Rydberg state --sensitive to electric fields-- that will result in a suppression of part of the $D_{\\alpha}$ emission. We refer to this approach as Laser-Induced Rydberg Spectroscopy (LIRyS). It is shown that the local electric field can be measured through the Stark induced resonances observed as dips in the $D_\\alpha$ emission. Using forward-modeling of simulated absorption spectra, we show precisions reaching \\SI{\\pm 2}{\\kilo\\volt\\per\\meter} in regions with a local electric field of \\SI{15}{\\kilo\\volt\\per\\meter}.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments (July 2018)", "language": "en_US" }, { "key": "dc.subject", "value": "Electric field", "language": "en_US" }, { "key": "dc.title", "value": "Modeling of a Laser-Induced Rydberg Spectroscopy diagnostic for Direct Measurement of the Local Electric Field in the Edge Region of NSTX/NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 89379, "name": "Injected mass deposition thresholds for lithium granule instigated triggering of edge localized modes on EAST", "handle": "88435/dsp01pk02cd394", "type": "item", "link": "/rest/items/89379", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-12-20 04:05:54.22", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Lunsford, R.", "language": null }, { "key": "dc.contributor.author", "value": "Sun, Z.", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.contributor.author", "value": "Hu, J.S.", "language": null }, { "key": "dc.contributor.author", "value": "Mansfield, D.", "language": null }, { "key": "dc.contributor.author", "value": "Xu, W.", "language": null }, { "key": "dc.contributor.author", "value": "Zuo, G.Z.", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "Osborne, T.", "language": null }, { "key": "dc.contributor.author", "value": "Tritz, K.", "language": null }, { "key": "dc.contributor.author", "value": "Canik, J.", "language": null }, { "key": "dc.contributor.author", "value": "Huang, M.", "language": null }, { "key": "dc.contributor.author", "value": "Meng, X.C.", "language": null }, { "key": "dc.contributor.author", "value": "Gong, X.Z.", "language": null }, { "key": "dc.contributor.author", "value": "Wan, B.N.", "language": null }, { "key": "dc.contributor.author", "value": "Li, J.G.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-12-19T14:05:17Z", "language": null }, { "key": "dc.date.available", "value": "2017-12-19T14:05:17Z", "language": null }, { "key": "dc.date.issued", "value": "2017-12", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01pk02cd394", "language": null }, { "key": "dc.description.abstract", "value": "The ability of an injected lithium granule to promptly trigger an edge localized mode (ELM) has been established in multiple experiments. By horizontally injecting granules ranging in diameter from 200 microns to 1mm in diameter into the low field side of EAST H-mode discharges we have determined that granules with diameter > 600 microns are successful in triggering ELMs more than 95% of the time. It was also demonstrated that below 600 microns the triggering efficiency decreased roughly with granule size. Granules were radially injected from the outer midplane with velocities ~ 80 m/s into EAST upper single null discharges with an ITER like tungsten monoblock divertor. These granules were individually tracked throughout their injection cycle in order to determine their efficacy at triggering an ELM. For those granules of sufficient size, ELM triggering was a prompt response to granule injection. By simulating the granule injection with an experimentally benchmarked neutral gas shielding (NGS) model, the ablatant mass deposition required to promptly trigger an ELM is calculated and the fractional mass deposition is determined.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion (December 2017)", "language": "en_US" }, { "key": "dc.subject", "value": "Lithium granules", "language": "en_US" }, { "key": "dc.subject", "value": "ELM triggering", "language": "en_US" }, { "key": "dc.subject", "value": "EAST", "language": "en_US" }, { "key": "dc.subject", "value": "H-mode", "language": "en_US" }, { "key": "dc.title", "value": "Injected mass deposition thresholds for lithium granule instigated triggering of edge localized modes on EAST", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 98996, "name": "Blob wakes in NSTX", "handle": "88435/dsp01vm40xv421", "type": "item", "link": "/rest/items/98996", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-08-09 05:10:26.075", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zweben SJ, Myra JR, Diallo A, Russell DA, Scotti F, Stotler DP", "language": null }, { "key": "dc.date.accessioned", "value": "2019-08-08T18:05:16Z", "language": null }, { "key": "dc.date.available", "value": "2019-08-08T18:05:16Z", "language": null }, { "key": "dc.date.issued", "value": "2019-07", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01vm40xv421", "language": null }, { "key": "dc.description.abstract", "value": "Transient small-scale structures were identified in the wake of blobs movingpoloidally through the SOL of high-powered H-mode plasmas in NSTX, using the gaspuff imaging (GPI) diagnostic. These blob wakes had a poloidal wavelength in therange 3.5 cm, which is significantly smaller than the average blob scale of~12 cm, and the wakes had a poloidal velocity of 1.5 km/sec in theelectron diamagnetic direction, which is opposite to the blob poloidal velocity inthese shots. These wakes were radially localized 0-4 cm outside the separatrix andoccurred within ~50 microsec after the passage of a blob through the GPI field of view.The clearest wakes were seen when the GPI viewing angle was well aligned with thelocal B field line, as expected for such small-scale structures given the diagnosticgeometry. A plausible theoretical interpretation of the wakes is discussed: theobserved wakes share some features of drift waves and/or drift-Alfven waves whichcould be excited", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "blobs;wakes;NSTX", "language": "en_US" }, { "key": "dc.title", "value": "Blob wakes in NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 100033, "name": "Reduced Model for Direct Induction Startup Scenario Development on MAST-U and NSTX-U", "handle": "88435/dsp01cv43p067x", "type": "item", "link": "/rest/items/100033", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-08-31 05:11:35.294", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Battaglia, D.J.", "language": null }, { "key": "dc.contributor.author", "value": "Thornton, A.J.", "language": null }, { "key": "dc.contributor.author", "value": "Gerhardt, S.P.", "language": null }, { "key": "dc.contributor.author", "value": "Kirk, A.", "language": null }, { "key": "dc.contributor.author", "value": "Kogan, L", "language": null }, { "key": "dc.contributor.author", "value": "Menard, J.E.", "language": null }, { "key": "dc.date.accessioned", "value": "2019-08-30T13:33:23Z", "language": null }, { "key": "dc.date.available", "value": "2019-08-30T13:33:23Z", "language": null }, { "key": "dc.date.issued", "value": "2019-08", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01cv43p067x", "language": null }, { "key": "dc.description.abstract", "value": "A reduced semi-empirical model using time-dependent axisymmetric vacuum field calculations is used to develop the prefill and feed-forward coil current targets required for reliable direct induction (DI) startup on the new MA-class spherical tokamaks, MAST-U and NSTX-U. The calculations are constrained by operational limits unique to each device, such as the geometry of the conductive elements and active coils, power supply specifications and coil heating and stress limits. The calculations are also constrained by semi-empirical models for sufficient breakdown, current drive, equilibrium and stability of the plasma developed from a shared database. A large database of DI startup on NSTX and NSTX-U is leveraged to quantify the requirements for achieving a reliable breakdown (Ip ~ 20 kA). It is observed that without pre-ionization, STs access the large E/P regime at modest loop voltage (Vloop) where the electrons in the weakly ionized plasma are continually accelerating along the open field lines. This ensures a rapid (order millisecond) breakdown of the neutral gas, even without pre-ionization or high-quality field nulls. The timescale of the initial increase in Ip on NSTX is reproduced in the reduced model provided a mechanism for impeding the applied electric field is included. Most discharges that fail in the startup phase are due to an inconsistency in the evolution of the plasma current (Ip) and equilibrium field or loss of vertical stability during the burn-through phase. The requirements for the self-consistent evolution of the fields in the weakly and full-ionized plasma states are derived from demonstrated DI startup on NSTX, NSTX-U and MAST. The predictive calculations completed for MAST-U and NSTX-U illustrate that the maximum Ip ramp rate (dIp/dt) in the early startup phase is limited by the voltage limits on the poloidal field coils on MAST-U and passive vertical stability on NSTX-U.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.subject", "value": "MAST-U", "language": "en_US" }, { "key": "dc.subject", "value": "Spherical tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Direct induction", "language": "en_US" }, { "key": "dc.subject", "value": "Start-up", "language": "en_US" }, { "key": "dc.subject", "value": "Pre-ionization", "language": "en_US" }, { "key": "dc.title", "value": "Reduced Model for Direct Induction Startup Scenario Development on MAST-U and NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 101740, "name": "Machine Learning Characterization of Alfv\u00e9nic and Sub-Alfv\u00e9nic Chirping and Correlation With Fast-Ion Loss at NSTX", "handle": "88435/dsp01m326m461v", "type": "item", "link": "/rest/items/101740", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-01-02 08:01:14.199", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Woods, B. J. Q.", "language": null }, { "key": "dc.contributor.author", "value": "Duarte, V. N.", "language": null }, { "key": "dc.contributor.author", "value": "Fredrickson, E. D.", "language": null }, { "key": "dc.contributor.author", "value": "Gorelenkov, N. N.", "language": null }, { "key": "dc.contributor.author", "value": "Podest\u00e0, M.", "language": null }, { "key": "dc.contributor.author", "value": "Vann, R. G. L.", "language": null }, { "key": "dc.date.accessioned", "value": "2020-01-02T13:01:13Z", "language": null }, { "key": "dc.date.available", "value": "2020-01-02T13:01:13Z", "language": null }, { "key": "dc.date.issued", "value": "2019-12", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01m326m461v", "language": null }, { "key": "dc.description.abstract", "value": "Abrupt large events in the Alfvenic and sub-Alfvenic frequency bands in tokamaks are typically correlated with increased fast-ion loss. Here, machine learning is used to speed up the laborious process of characterizing the behavior of magnetic perturbations from corresponding frequency spectrograms that are typically identified by humans. The analysis allows for comparison between different mode character (such as quiescent, fixed frequency, and chirping, avalanching) and plasma parameters obtained from the TRANSP code, such as the ratio of the neutral beam injection (NBI) velocity and the Alfven velocity (v_inj./v_A), the q-profile, and the ratio of the neutral beam beta and the total plasma beta (beta_beam,i / beta). In agreement with the previous work by Fredrickson et al., we find a correlation between beta_beam,i and mode character. In addition, previously unknown correlations are found between moments of the spectrograms and mode character. Character transition from quiescent to nonquiescent behavior for magnetic fluctuations in the 50200-kHz frequency band is observed along the boundary v_phi ~ (1/4)(v_inj. - 3v_A), where v_phi is the rotation velocity.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "IEEE Transactions on Plasma Science", "language": "en_US" }, { "key": "dc.subject", "value": "machine learning", "language": "en_US" }, { "key": "dc.subject", "value": "tokamak physics", "language": "en_US" }, { "key": "dc.subject", "value": "plasma physics", "language": "en_US" }, { "key": "dc.title", "value": "Machine Learning Characterization of Alfv\u00e9nic and Sub-Alfv\u00e9nic Chirping and Correlation With Fast-Ion Loss at NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 100311, "name": "Analytic stability boundaries for compressional and global Alfven eigenmodes driven by fast ions. I. Interaction via ordinary and anomalous cyclotron resonances.", "handle": "88435/dsp01gb19f8697", "type": "item", "link": "/rest/items/100311", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-01-24 16:53:08.08", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Lestz J.B., Gorelenkov N.N., Belova E.V., Tang S.X., Crocker N.A.", "language": null }, { "key": "dc.date.accessioned", "value": "2020-01-02T13:02:30Z", "language": null }, { "key": "dc.date.available", "value": "2020-01-02T13:02:30Z", "language": null }, { "key": "dc.date.issued", "value": "2019-09", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01gb19f8697", "language": null }, { "key": "dc.description.abstract", "value": "Conditions for net fast ion drive are derived for beam-driven, sub-cyclotron compressional (CAE) and global (GAE) Alfven eigenmodes, such as those routinely observed in spherical tokamaks such as NSTX(-U) and MAST. Both co- and counter-propagating CAEs and GAEs are investigated, driven by the ordinary and anomalous Doppler-shifted cyclotron resonance with fast ions. Whereas prior results were restricted to vanishingly narrow distributions in velocity space, broad parameter regimes are identified in this work which enable an analytic treatment for realistic fast ion distributions generated by neutral beam injection. The simple, approximate conditions derived in these regimes for beam distributions of realistic width compare well to the numerical evaluation of the full analytic expressions for fast ion drive. Moreover, previous results in the very narrow beam case are corrected and generalized to retain all terms in omega/omega_{ci} and k_{||}/kperp, which are often assumed to be small parameters but can significantly modify the conditions of drive and damping when they are non-negligible. Favorable agreement is demonstrated between the approximate stability criterion, simulation results, and a large database of NSTX observations of cntr-GAEs.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "Alfven eigenmodes, fast ions, energetic particles, linear stability, cyclotron resonance", "language": "en_US" }, { "key": "dc.title", "value": "Analytic stability boundaries for compressional and global Alfven eigenmodes driven by fast ions. I. Interaction via ordinary and anomalous cyclotron resonances.", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 95220, "name": "Initial transport and turbulence analysis and gyrokinetic simulation validation in NSTX-U L-mode plasmas", "handle": "88435/dsp01f4752k53m", "type": "item", "link": "/rest/items/95220", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-03-13 04:26:28.928", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Guttenfelder, W.", "language": null }, { "key": "dc.contributor.author", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.author", "value": "Kreite, D.M.", "language": null }, { "key": "dc.contributor.author", "value": "Bell, R.E.", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "LeBlanc, B.P.", "language": null }, { "key": "dc.contributor.author", "value": "McKee, G.R.", "language": null }, { "key": "dc.contributor.author", "value": "Podesta, M.", "language": null }, { "key": "dc.contributor.author", "value": "Sabbagh, S.A.", "language": null }, { "key": "dc.contributor.author", "value": "Smith, D.R.", "language": null }, { "key": "dc.date.accessioned", "value": "2019-03-12T20:31:31Z", "language": null }, { "key": "dc.date.available", "value": "2019-03-12T20:31:31Z", "language": null }, { "key": "dc.date.issued", "value": "2019-03", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01f4752k53m", "language": null }, { "key": "dc.description.abstract", "value": "Transport analysis, ion-scale turbulence measurements, and initial linear and nonlinear gyrokinetic simulations are reported for a transport validation study based on low aspect ratio NSTX-U L-mode discharges. The relatively long, stationary L-modes enabled by the upgraded centerstack provide a more ideal target for transport validation studies that were not available during NSTX operation. Transport analysis shows that anomalous electron transport dominates energy loss while ion thermal transport is well described by neoclassical theory. Linear gyrokinetic GYRO analysis predicts that ion temperature gradient (ITG) modes are unstable around normalized radii $\\rho$=0.6-0.8, although $E\\timesB$ shearing rates are larger than the linear growth rates over much of that region. Deeper in the core ($\\rho$=0.4-0.6), electromagnetic microtearing modes (MTM) are unstable as a consequence of the relatively high beta and collisionality in these particular discharges. Consistent with the linear analysis, local, nonlinear ion-scale GYRO simulations predict strong ITG transport at $\\rho$=0.76, whereas electromagnetic MTM transport is important at $\\rho$=0.47. The prediction of ion-scale turbulence is consistent with 2D beam emission spectroscopy (BES) that measures the presence of broadband ion-scale fluctuations. Interestingly, the BES measurements also indicate the presence of bi-modal poloidal phase velocity propagation that could be indicative of two different turbulence types. However, in the region between ($\\rho$=0.56, 0.66), ion-scale simulations are strongly suppressed by the locally large $E\\timesB$ shear. Instead, electron temperature gradient (ETG) turbulence simulations predict substantial transport, illustrating electron-scale contributions can be important in low aspect ratio L-modes, similar to recent analysis at conventional aspect ratio. However, agreement within experimental uncertainties has not been demonstrated, which requires additional simulations to test parametric sensitivities. The potential need to include profile-variation effects (due to the relatively large value of $\\rho_*$=$\\rho_i$/a at low aspect ratio), including electromagnetic and possibly multi-scale effects, is also discussed.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion (March 2019)", "language": "en_US" }, { "key": "dc.subject", "value": "Spherical tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Gyrokinetics", "language": "en_US" }, { "key": "dc.subject", "value": "Turbulence", "language": "en_US" }, { "key": "dc.subject", "value": "Transport", "language": "en_US" }, { "key": "dc.subject", "value": "Validation", "language": "en_US" }, { "key": "dc.title", "value": "Initial transport and turbulence analysis and gyrokinetic simulation validation in NSTX-U L-mode plasmas", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 95551, "name": "TRANSP-based Optimization Towards Tokamak Scenario Development", "handle": "88435/dsp01pc289m87q", "type": "item", "link": "/rest/items/95551", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-04-02 04:16:43.109", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "W.P. Wehner, E. Schuster, M.D. Boyer, F. Poli", "language": null }, { "key": "dc.date.accessioned", "value": "2019-04-01T16:54:48Z", "language": null }, { "key": "dc.date.available", "value": "2019-04-01T16:54:48Z", "language": null }, { "key": "dc.date.issued", "value": "2019-04", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01pc289m87q", "language": null }, { "key": "dc.description.abstract", "value": "An optimization approach that incorporates the predictive transport code TRANSP is proposed for tokamak scenario development. Optimization methods are often employed to develop open-loop control strategies to aid access to high performance tokamak scenarios. In general, the optimization approaches use control-oriented models, i.e. models that are reduced in complexity and prediction accuracy as compared to physics-oriented transport codes such as TRANSP. In the presented approach, an optimization procedure using the TRANSP code to simulate the tokamak plasma is considered for improved predictive capabilities. As a test case, the neutral beam injection (NBI) power is optimized to develop a control strategy that maximizes the non-inductive current fraction during the ramp-up phase for NSTX-U. Simulation studies towards the achievement of non-inductive ramp up in NSTX-U have already been carried out with the TRANSP code. The optimization-based approach proposed in this work is used to maximize the non-inductive current fraction during ramp-up in NSTX-U, demonstrating that the scenario development task can be automated. An additional test case considers optimization of the current ramp rate in DIII-D for obtaining a stationary plasma characterized by\na flat loop voltage profile in the flattop phase.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Fusion Engineering and Design", "language": "en_US" }, { "key": "dc.subject", "value": "TRANSP", "language": "en_US" }, { "key": "dc.subject", "value": "scenario development", "language": "en_US" }, { "key": "dc.subject", "value": "optimal control design", "language": "en_US" }, { "key": "dc.subject", "value": "optimal plasma scenario planning", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX-U", "language": "en_US" }, { "key": "dc.subject", "value": "DIII-D", "language": "en_US" }, { "key": "dc.title", "value": "TRANSP-based Optimization Towards Tokamak Scenario Development", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 85627, "name": "Full-wave simulations of ICRF heating regimes in toroidal plasmas with non-Maxwellian distribution functions", "handle": "88435/dsp01g445cg642", "type": "item", "link": "/rest/items/85627", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-04-04 09:18:04.241", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Bertelli, N", "language": null }, { "key": "dc.contributor.author", "value": "Valeo, E.J.", "language": null }, { "key": "dc.contributor.author", "value": "Green, D.L.", "language": null }, { "key": "dc.contributor.author", "value": "Gorelenkova, M.", "language": null }, { "key": "dc.contributor.author", "value": "Phillips, C.K.", "language": null }, { "key": "dc.contributor.author", "value": "Podesta, M.", "language": null }, { "key": "dc.contributor.author", "value": "Lee, J.P.", "language": null }, { "key": "dc.contributor.author", "value": "Wright, J.C.", "language": null }, { "key": "dc.contributor.author", "value": "Jaeger, E.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-03-20T13:53:24Z", "language": null }, { "key": "dc.date.available", "value": "2017-03-20T13:53:24Z", "language": null }, { "key": "dc.date.issued", "value": "2017-05", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01g445cg642", "language": null }, { "key": "dc.description.abstract", "value": "At the power levels required for significant heating and current drive\r\nin magnetically-confined toroidal plasma, modification of the particle distribution\r\nfunction from a Maxwellian shape is likely [T. H. Stix, Nucl. Fusion, 15 737\r\n(1975)], with consequent changes in wave propagation and in the location and\r\namount of absorption. In order to study these effects computationally, both the\r\nfinite-Larmor-radius and the high-harmonic fast wave (HHFW), versions of the\r\nfull-wave, hot-plasma toroidal simulation code TORIC [M. Brambilla, Plasma Phys.\r\nControl. Fusion 41, 1 (1999) and M. Brambilla, Plasma Phys. Control. Fusion\r\n44, 2423 (2002)], have been extended to allow the prescription of arbitrary velocity\r\ndistributions of the form f(v||, v_perp, psi , theta). For hydrogen (H) minority heating of a\r\ndeuterium (D) plasma with anisotropic Maxwellian H distributions, the fractional\r\nH absorption varies significantly with changes in parallel temperature but is\r\nessentially independent of perpendicular temperature. On the other hand, for\r\nHHFW regime with anisotropic Maxwellian fast ion distribution, the fractional\r\nbeam ion absorption varies mainly with changes in the perpendicular temperature.\r\nThe evaluation of the wave-field and power absorption, through the full wave\r\nsolver, with the ion distribution function provided by either aMonte-Carlo particle\r\nand Fokker-Planck codes is also examined for Alcator C-Mod and NSTX plasmas.\r\nNon-Maxwellian effects generally tends to increase the absorption with respect to\r\nthe equivalent Maxwellian distribution.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion vol. 57, p. 056035 (May 2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/aa66db", "language": null }, { "key": "dc.title", "value": "Full-wave simulations of ICRF heating regimes in toroidal plasmas with non-Maxwellian distribution functions", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 85628, "name": "Feedback control design for non-inductively sustained scenarios in NSTX-U using TRANSP", "handle": "88435/dsp01bc386m71v", "type": "item", "link": "/rest/items/85628", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-04-28 13:23:53.164", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Boyer, M.D.", "language": null }, { "key": "dc.contributor.author", "value": "Andre, R.G.", "language": null }, { "key": "dc.contributor.author", "value": "Gates, D.A.", "language": null }, { "key": "dc.contributor.author", "value": "Gerhardt, S.P.", "language": null }, { "key": "dc.contributor.author", "value": "Menard, J.E.", "language": null }, { "key": "dc.contributor.author", "value": "Poli, F.M.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-03-20T14:00:51Z", "language": null }, { "key": "dc.date.available", "value": "2017-03-20T14:00:51Z", "language": null }, { "key": "dc.date.issued", "value": "2017-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01bc386m71v", "language": null }, { "key": "dc.description.abstract", "value": "This paper examines a method for real-time control of non-inductively sustained scenarios in NSTX-U by using TRANSP,\r\na time-dependent integrated modeling code for prediction and interpretive analysis of tokamak experimental data, as a\r\nsimulator. The actuators considered for control in this work are the six neutral beam sources and the plasma boundary\r\nshape. To understand the response of the plasma current, stored energy, and central safety factor to these actuators\r\nand to enable systematic design of control algorithms, simulations were run in which the actuators were modulated and\r\na linearized dynamic response model was generated. A multi-variable model-based control scheme that accounts for the\r\ncoupling and slow dynamics of the system while mitigating the effect of actuator limitations was designed and\r\nsimulated. Simulations show that modest changes in the outer gap and heating power can improve the response time of\r\nthe system, reject perturbations, and track target values of the controlled values.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion vol. 57 p. 066017 (June 2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/aa68e9", "language": null }, { "key": "dc.subject", "value": "Spherical torus", "language": "en_US" }, { "key": "dc.subject", "value": "Non-inductive scenarios", "language": "en_US" }, { "key": "dc.subject", "value": "Feedback control", "language": "en_US" }, { "key": "dc.subject", "value": "Predictive simulations", "language": "en_US" }, { "key": "dc.title", "value": "Feedback control design for non-inductively sustained scenarios in NSTX-U using TRANSP", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 85011, "name": "A Reduced Resistive Wall Mode Kinetic Stability Model for Disruption Forecasting", "handle": "88435/dsp01dj52w7187", "type": "item", "link": "/rest/items/85011", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-02-27 16:24:06.164", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Berkery, J.W.", "language": null }, { "key": "dc.contributor.author", "value": "Sabbagh, S.A.", "language": null }, { "key": "dc.contributor.author", "value": "Bell, R.E.", "language": null }, { "key": "dc.contributor.author", "value": "Gerhardt, S.P.", "language": null }, { "key": "dc.contributor.author", "value": "LeBlanc, B.P.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-01-11T21:30:47Z", "language": null }, { "key": "dc.date.available", "value": "2017-01-11T21:30:47Z", "language": null }, { "key": "dc.date.issued", "value": "2017-05", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01dj52w7187", "language": null }, { "key": "dc.description.abstract", "value": "Kinetic modification of ideal stability theory from stabilizing resonances of mode-particle interaction has had success in explaining resistive wall mode (RWM) stability limits in tokamaks. With the goal of real-time stability forecasting, a reduced kinetic stability model has been implemented in the new Disruption Event Characterization and Forecasting (DECAF) code, which has been written to analyze disruptions in tokamaks. The reduced model incorporates parameterized models for ideal limits on beta, a ratio of plasma pressure to magnetic pressure, which are shown to be in good agreement with DCON code calculations. Increased beta between these ideal limits causes a shift in the unstable region of delta W_K space, where delta W_K is the change in potential energy due to kinetic effects that is solved for by the reduced model, such that it is possible for plasmas to be unstable at intermediate beta but stable at higher beta. Gaussian functions for delta W_K are defined as functions of E cross B frequency and collisionality, with parameters reflecting the experience of the National Spherical Torus Experiment (NSTX). The reduced model was tested on a database of discharges from NSTX and experimentally stable and unstable discharges were separated noticeably on a stability map in E cross B frequency, collisionality space. The reduced model only failed to predict an unstable RWM in 15.6% of cases with an experimentally unstable RWM and performed well on predicting stability for experimentally stable discharges as well.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas Vol. 24 p. 056103 (May 2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4976853", "language": null }, { "key": "dc.title", "value": "A Reduced Resistive Wall Mode Kinetic Stability Model for Disruption Forecasting", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 84911, "name": "Diagnostics for molybdenum and tungsten erosion and transport in NSTX-U", "handle": "88435/dsp01q524jr266", "type": "item", "link": "/rest/items/84911", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-12-23 01:11:21.822", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Scotti, F.", "language": null }, { "key": "dc.contributor.author", "value": "Soukhanovskii, V.", "language": null }, { "key": "dc.contributor.author", "value": "Weller, M.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-12-22T18:54:24Z", "language": null }, { "key": "dc.date.available", "value": "2016-12-22T18:54:24Z", "language": null }, { "key": "dc.date.issued", "value": "2016-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01q524jr266", "language": null }, { "key": "dc.description.abstract", "value": "A comprehensive set of spectroscopic diagnostics is planned in the National Spherical Torus Experi- ment Upgrade to connect measurements of molybdenum and tungsten divertor sources to scrape-o\u21b5 layer (SOL) and core impurity transport, supporting the installation of high-Z plasma facing compo- nents which is scheduled to begin with a row of molybdenum tiles. Imaging with narrow-bandpass interference filters and high-resolution spectroscopy will be coupled to estimate divertor impurity influxes. Vacuum ultraviolet and extreme ultraviolet spectrometers will allow connecting high-Z sources to SOL transport and core impurity content. The high-Z diagnostics suite complements the existing measurements for low-Z impurities (carbon and lithium), critical for the characterization of sputtering of high-Z materials.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and jpeg figure files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments, Vol. 87, p. 11D445 (November 2016);", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4963146", "language": "en_US" }, { "key": "dc.title", "value": "Diagnostics for molybdenum and tungsten erosion and transport in NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 89513, "name": "Plasma boundary shape control and real-time equilibrium reconstruction on NSTX-U", "handle": "88435/dsp018623j140r", "type": "item", "link": "/rest/items/89513", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-02-23 15:46:17.863", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Boyer, M.", "language": null }, { "key": "dc.contributor.author", "value": "Battaglia, D.", "language": null }, { "key": "dc.contributor.author", "value": "Mueller, D.", "language": null }, { "key": "dc.contributor.author", "value": "Eidietis, N.", "language": null }, { "key": "dc.contributor.author", "value": "Erickson, K.", "language": null }, { "key": "dc.contributor.author", "value": "Ferron, J.", "language": null }, { "key": "dc.contributor.author", "value": "Gates, D.", "language": null }, { "key": "dc.contributor.author", "value": "Gerhardt, S.", "language": null }, { "key": "dc.contributor.author", "value": "Johnson, R.", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, E.", "language": null }, { "key": "dc.contributor.author", "value": "Menard, J.", "language": null }, { "key": "dc.contributor.author", "value": "Myers, C.", "language": null }, { "key": "dc.contributor.author", "value": "Sabbagh, S.", "language": null }, { "key": "dc.contributor.author", "value": "Scotti, F.", "language": null }, { "key": "dc.contributor.author", "value": "Vail, P.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-01-09T23:04:54Z", "language": null }, { "key": "dc.date.available", "value": "2018-01-09T23:04:54Z", "language": null }, { "key": "dc.date.issued", "value": "2018-03", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp018623j140r", "language": null }, { "key": "dc.description.abstract", "value": "The upgrade to the National Spherical Torus eXperiment (NSTX-U) included two main improvements: a larger center-stack, enabling higher toroidal field and longer pulse duration, and the addition of three new tangentially aimed neutral beam sources, which increase available heating and current drive, and allow for flexibility in shaping power, torque, current, and particle deposition profiles. To best use these new capabilities and meet the high-performance operational goals of NSTX-U, major upgrades to the NSTX-U Control System (NCS) hardware and software have been made. Several control algorithms, including those used for real-time equilibrium reconstruction and shape control, have been upgraded to improve and extend plasma control capabilities. As part of the commissioning phase of first plasma operations, the shape control system was tuned to control the boundary in both inner-wall limited and diverted discharges. It has been used to accurately track the requested evolution of the boundary (including the size of the inner gap between the plasma and central solenoid, which is a challenge for the ST configuration), X-point locations, and strike point locations, enabling repeatable discharge evolutions for scenario development and diagnostic commissioning.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion vol. 58 p. 036016 (March 2018)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/aa9e3f", "language": null }, { "key": "dc.title", "value": "Plasma boundary shape control and real-time equilibrium reconstruction on NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 94412, "name": "Application of transient CHI plasma startup to future ST and AT devices", "handle": "88435/dsp011544br87z", "type": "item", "link": "/rest/items/94412", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-03-29 13:32:21.29", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.advisor", "value": null, "language": null }, { "key": "dc.contributor.author", "value": "Hammond, K.C.", "language": null }, { "key": "dc.contributor.author", "value": "Raman, R.", "language": null }, { "key": "dc.contributor.author", "value": "Jardin, S.C.", "language": null }, { "key": "dc.date.accessioned", "value": "2019-02-08T19:18:12Z", "language": null }, { "key": "dc.date.available", "value": "2019-02-08T19:18:12Z", "language": null }, { "key": "dc.date.issued", "value": "2019-02", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp011544br87z", "language": null }, { "key": "dc.description.abstract", "value": "Employment of non-inductive plasma start-up techniques would considerably simplify the design of a spherical tokamak fusion reactor. Transient coaxial helicity injection (CHI) is a promising method, expected to scale favorably to next-step reactors. However, the implications of reactor-relevant parameters on the initial breakdown phase for CHI have not yet been considered. Here, we evaluate CHI breakdown in reactor-like configurations using an extension of the Townsend avalanche theory. We find that a CHI electrode concept in which the outer vessel wall is biased to achieve breakdown, while previously successful on NSTX and HIT-II, may exhibit a severe weakness when scaled up to a reactor. On the other hand, concepts which employ localized biasing electrodes such as those used in QUEST would avoid this issue. Assuming that breakdown can be successfully attained, we then apply scaling relationships to predict plasma parameters attainable in the transient CHI discharge. Assuming the use of 1 Wb of injector flux, we find that plasma currents of 1 MA should be achievable. Furthermore, these plasmas are expected to Ohmically self-heat with more than 1 MW of power as they decay, facilitating efficient hand-off to steady-state heating sources. These optimistic scalings are supported by TSC simulations.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme, digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas (February 2019)", "language": "en_US" }, { "key": "dc.subject", "value": "Coaxial Helicity Injection", "language": "en_US" }, { "key": "dc.subject", "value": "CHI", "language": "en_US" }, { "key": "dc.subject", "value": "ST-FNSF", "language": "en_US" }, { "key": "dc.subject", "value": "Solenoid-free", "language": "en_US" }, { "key": "dc.subject", "value": "Start-up", "language": "en_US" }, { "key": "dc.subject", "value": "Breakdown", "language": "en_US" }, { "key": "dc.subject", "value": "Townsend", "language": "en_US" }, { "key": "dc.subject", "value": "Avalanche", "language": "en_US" }, { "key": "dc.title", "value": "Application of transient CHI plasma startup to future ST and AT devices", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 101931, "name": "Analytic stability boundaries for compressional and global Alfven eigenmodes driven by fast ions. II. Interaction via Landau resonance.", "handle": "88435/dsp013r074x84p", "type": "item", "link": "/rest/items/101931", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-01-24 08:58:44.851", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Lestz, J.B.", "language": null }, { "key": "dc.contributor.author", "value": "Gorelenkov, N.N.", "language": null }, { "key": "dc.contributor.author", "value": "Belova, E.V.", "language": null }, { "key": "dc.contributor.author", "value": "Tang, S.X.", "language": null }, { "key": "dc.contributor.author", "value": "Crocker, N.A.", "language": null }, { "key": "dc.date.accessioned", "value": "2020-01-20T22:07:13Z", "language": null }, { "key": "dc.date.available", "value": "2020-01-20T22:07:13Z", "language": null }, { "key": "dc.date.issued", "value": "2020-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp013r074x84p", "language": null }, { "key": "dc.description.abstract", "value": "Conditions for net fast ion drive are derived for beam-driven, co-propagating, sub-cyclotron compressional (CAE) and global (GAE) Alfven eigenmodes driven by the Landau resonance with super-Alfvenic fast ions. Approximations applicable to realistic neutral beam distributions and mode characteristics observed in spherical tokamaks enable the derivation of marginal stability conditions for these modes. Such conditions successfully reproduce the stability boundaries found from numerical integration of the exact expression for local fast ion drive/damping. Coupling between the CAE and GAE branches of the dispersion due to finite \\omega/\\omega_{ci} and k_\\parallel/k_\\perp is retained and found to be responsible for the existence of the GAE instability via this resonance. Encouraging agreement is demonstrated between the approximate stability criterion, simulation results, and a database of NSTX observations of co-CAEs.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "null", "language": "en_US" }, { "key": "dc.title", "value": "Analytic stability boundaries for compressional and global Alfven eigenmodes driven by fast ions. II. Interaction via Landau resonance.", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 93075, "name": "ELM frequency enhancement and discharge modification through lithium granule injection into EAST H-modes", "handle": "88435/dsp01zc77ss87k", "type": "item", "link": "/rest/items/93075", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-10-04 10:07:13.776", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Lunsford", "language": null }, { "key": "dc.contributor.author", "value": "Hsu, J.S.", "language": null }, { "key": "dc.contributor.author", "value": "Sun, Z.", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, R.", "language": null }, { "key": "dc.contributor.author", "value": "Mansfield, D.K.", "language": null }, { "key": "dc.contributor.author", "value": "Xu, W.", "language": null }, { "key": "dc.contributor.author", "value": "Zuo, G.Z.", "language": null }, { "key": "dc.contributor.author", "value": "Huang, M.", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "Osborne, T.", "language": null }, { "key": "dc.contributor.author", "value": "Tritz, K.", "language": null }, { "key": "dc.contributor.author", "value": "Canik, J.", "language": null }, { "key": "dc.contributor.author", "value": "Meng, X.C.", "language": null }, { "key": "dc.contributor.author", "value": "Gong, X.Z.", "language": null }, { "key": "dc.contributor.author", "value": "Wan, B.N.", "language": null }, { "key": "dc.contributor.author", "value": "Li, J.G.", "language": null }, { "key": "dc.contributor.author", "value": "EAST Team", "language": null }, { "key": "dc.date.accessioned", "value": "2018-10-04T14:07:12Z", "language": null }, { "key": "dc.date.available", "value": "2018-10-04T14:07:12Z", "language": null }, { "key": "dc.date.issued", "value": "2018-10", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01zc77ss87k", "language": null }, { "key": "dc.description.abstract", "value": "The injection of impurity granules into fusion research discharges can serve \r\nas a catalyst for ELM events. For sufficiently low ELM frequencies, and granule \r\nsizes above a threshold, this can result in full control of the ELM cycle, \r\nreferred to as ELM pacing. For this research, we extend the investigation \r\nto conditions where the natural ELM frequency is too high for ELM pacing to \r\nbe realized. Utilizing multiple sizes of lithium granules and classifying their \r\neffects by granule size, we demonstrate that ELM mitigation through frequency \r\nmultiplication can be used at ELM triggering rates that nominally make ELM pacing \r\nunrealizable. We find that above a size threshold, injected granules promptly \r\ntrigger ELMs and commensurately enhance the ELM frequency . Below this threshold \r\nsize, injection of an individual granule does not always lead to the prompt \r\ntriggering of an ELM; however, collective ablation in the edge pedestal region \r\ndoes enhance the ELM frequency. Specifically, Li granules too small to individually \r\ntrigger ELMs were injected into EAST H-mode discharges at frequencies up to 2.3 kHz; \r\ncollectively the granules were observed to enhance the natural ELM frequency up to \r\n620 Hz, resulting in a ~2.4x multiplication of the natural ELM frequency and a 50% \r\ndecrease of the ELM size.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digitial data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "ELM", "language": "en_US" }, { "key": "dc.subject", "value": "Lithium", "language": "en_US" }, { "key": "dc.subject", "value": "Pacing", "language": "en_US" }, { "key": "dc.subject", "value": "EAST", "language": "en_US" }, { "key": "dc.subject", "value": "Granules", "language": "en_US" }, { "key": "dc.title", "value": "ELM frequency enhancement and discharge modification through lithium granule injection into EAST H-modes", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 108611, "name": "Modeling of resistive plasma response in toroidal geometry using an asymptotic matching approach", "handle": "88435/dsp0141687m529", "type": "item", "link": "/rest/items/108611", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-10-26 17:06:25.729", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Z. R. Wang", "language": null }, { "key": "dc.contributor.author", "value": "A. H. Glasser", "language": null }, { "key": "dc.contributor.author", "value": "D. Brennan", "language": null }, { "key": "dc.contributor.author", "value": "Y. Q. Liu", "language": null }, { "key": "dc.contributor.author", "value": "J-K. Park", "language": null }, { "key": "dc.date.accessioned", "value": "2020-10-26T21:04:27Z", "language": null }, { "key": "dc.date.available", "value": "2020-10-26T21:04:27Z", "language": null }, { "key": "dc.date.issued", "value": "2020-10", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp0141687m529", "language": null }, { "key": "dc.description.abstract", "value": "The method of solving linear resistive plasma response, based on the asymptotic matching approach, is developed for full toroidal tokamaks by upgrading the Resistive DCON code [A.H. Glasser, Z.R. Wang and J.-K. Park, Physics of Plasmas, \\textbf{23}, 112506 (2016)]. The derived matching matrix, asymptotically matching the outer and inner regions, indicates that the applied three dimension (3-D) magnetic perturbations contribute additional small solutions at each resonant surface due to the toroidal coupling of poloidal modes. In contrast, the resonant harmonic only affects the corresponding resonant surface in the cylindrical plasma. Since the solution of ideal outer region is critical to the asymptotic matching and is challenging to be solved in the toroidal geometry due to the singular power series solution at the resonant surfaces, systematic verification of the outer region $\\Delta^\\prime$ matrix is made by reproducing the well known analytical $\\Delta^{\\prime}$ result in [H.P. Furth, P.H. Rutherford and H. Selberg, The Physics of Fluids, \\textbf{16}, 1054-1063 (1073)] as well as by making a quantitative benchmark with the PEST3 code [A. Pletzer and R.L. Dewar, J. Plasma Physics, \\textbf{45}, 427-451 (1991)]. Finally, the reconstructed numerical solution of resistive plasma response from the toroidal matching matrix is presented. Comparing with the ideal plasma response, the global structure of the response can be affected by the small finite island at the resonant surfaces.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "MHD simulation", "language": "en_US" }, { "key": "dc.subject", "value": "resistive plasma response", "language": "en_US" }, { "key": "dc.title", "value": "Modeling of resistive plasma response in toroidal geometry using an asymptotic matching approach", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 108613, "name": "Simulating pitch angle scattering using an explicitly solvable energy-conserving algorithm", "handle": "88435/dsp01vh53wz79c", "type": "item", "link": "/rest/items/108613", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-10-26 17:08:52.368", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zhang, Xin", "language": "" }, { "key": "dc.contributor.author", "value": "Fu, Yichen", "language": "" }, { "key": "dc.contributor.author", "value": "Qin, Hong", "language": "" }, { "key": "dc.date.accessioned", "value": "2020-10-26T21:08:51Z", "language": null }, { "key": "dc.date.available", "value": "2020-10-26T21:08:51Z", "language": null }, { "key": "dc.date.issued", "value": "2020-09", "language": "" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01vh53wz79c", "language": null }, { "key": "dc.description.abstract", "value": "Particle distribution functions evolving under the Lorentz operator can be simulated with the Langevin equation for pitch angle scattering. This approach is frequently used in particle based Monte-Carlo simulations of plasma collisions, among others. However, most numerical treatments do not guarantee energy conservation, which may lead to unphysical artifacts such as numerical heating and spectra distortions. We present a novel structure-preserving numerical algorithm for the Langevin equation for pitch angle scattering. Similar to the well-known Boris algorithm, the proposed numerical scheme takes advantage of the structure-preserving properties of the Cayley transform when calculating the velocity-space rotations. The resulting algorithm is explicitly solvable, while preserving the norm of velocities down to machine precision. We demonstrate that the method has the same order of numerical convergence as the traditional stochastic Euler-Maruyama method.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physical Review E", "language": "en_US" }, { "key": "dc.subject", "value": "", "language": "en_US" }, { "key": "dc.title", "value": "Simulating pitch angle scattering using an explicitly solvable energy-conserving algorithm", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 108882, "name": "Dynamics of filaments during the edge-localized mode crash on NSTX", "handle": "88435/dsp011v53k104h", "type": "item", "link": "/rest/items/108882", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-01-20 13:23:18.8", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Lampert,Mate", "language": "" }, { "key": "dc.contributor.author", "value": "Diallo,Ahmed", "language": "" }, { "key": "dc.contributor.author", "value": "Myra,James R.", "language": "" }, { "key": "dc.contributor.author", "value": "Zweben, Stewart J.", "language": "" }, { "key": "dc.date.accessioned", "value": "2021-01-20T18:23:16Z", "language": null }, { "key": "dc.date.available", "value": "2021-01-20T18:23:16Z", "language": null }, { "key": "dc.date.issued", "value": "2021-01", "language": "" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp011v53k104h", "language": null }, { "key": "dc.description.abstract", "value": "Edge localized modes (ELMs) are routinely observed in H-mode plasma regimes of the National Spherical Torus Experiment (NSTX). Due to the explosive nature of the instability, only diagnostics with high temporal and spatial resolution could provide a detailed insight into the dynamics associated with the ELMs. Gas-puff imaging (GPI) at NSTX provides 2D measurements of the magnetic field aligned fluctuations (e.g. ELM filaments) in the scrape-off layer and the at the plasma edge with 2.5 us temporal and 10 mm optical resolution.A novel analysis technique was developed to estimate the frame-by-frame velocities and the spatial parameters of the dominant structures associated with the ELMs. The analysis was applied to single ELM events to characterize the ELM crash dynamics, and then extended to a database of 169 ELM events.Statistical analysis was performed in order to find the characterizing dynamics of the ELM crash. The results show that on average an ELM crash consists of a filament with a circular cross-section which is propelled outwards with a characterizing peak radial velocity of ~3.3 km/s. The radial velocity was found to be linearly dependent on the distance of the filament from the separatrix, which has never been seen before. The ELM filament is characterized by propagation in the ion-diamagnetic direction poloidally with a peak velocity of 11.4 km/s. The ELM crash lasts for approximately 100us until the radial propulsion settles back to the pre-ELM level. The experimental findings were compared with analytical theory. Two possible mechanisms were identified for explaining the observations: the curvature interchange model and the current-filament interaction model.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "ELMs", "language": "en_US" }, { "key": "dc.subject", "value": "correlation", "language": "en_US" }, { "key": "dc.subject", "value": "dynamics", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.subject", "value": "GPI", "language": "en_US" }, { "key": "dc.title", "value": "Dynamics of filaments during the edge-localized mode crash on NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 108957, "name": "Prediction of electron density and pressure profile shapes on NSTX-U using neural networks", "handle": "88435/dsp015999n646v", "type": "item", "link": "/rest/items/108957", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-02-19 15:53:49.076", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Boyer, Mark", "language": "" }, { "key": "dc.contributor.author", "value": "Chadwick, Jason", "language": "" }, { "key": "dc.date.accessioned", "value": "2021-02-19T20:53:48Z", "language": null }, { "key": "dc.date.available", "value": "2021-02-19T20:53:48Z", "language": null }, { "key": "dc.date.issued", "value": "2021-02", "language": "" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp015999n646v", "language": null }, { "key": "dc.description.abstract", "value": "A new model for prediction of electron density and pressure profile shapes on NSTX and NSTX-U has been developed using neural networks. The model has been trained and tested on measured profiles from experimental discharges during the first operational campaign of NSTX-U. By projecting profiles onto empirically derived basis functions, the model is able to efficiently and accurately reproduce profile shapes. In order to project the performance of the model to upcoming NSTX-U operations, a large database of profiles from the operation of NSTX is used to test performance as a function of available data. The rapid execution time of the model is well suited to the planned applications, including optimization during scenario development activities, and real-time plasma control. A potential application of the model to real-time profile estimation is demonstrated.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "", "language": "en_US" }, { "key": "dc.title", "value": "Prediction of electron density and pressure profile shapes on NSTX-U using neural networks", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 108969, "name": "Synergy of Coupled Kink and Tearing Modes in Fast Ion Transport", "handle": "88435/dsp01vt150n32t", "type": "item", "link": "/rest/items/108969", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-02-26 15:50:02.129", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Yang, J.", "language": "" }, { "key": "dc.contributor.author", "value": "Podesta, M.", "language": "" }, { "key": "dc.contributor.author", "value": "Fredrickson, E.", "language": "" }, { "key": "dc.date.accessioned", "value": "2021-02-26T20:50:00Z", "language": null }, { "key": "dc.date.available", "value": "2021-02-26T20:50:00Z", "language": null }, { "key": "dc.date.issued", "value": "2021-02", "language": "" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01vt150n32t", "language": null }, { "key": "dc.description.abstract", "value": "One aspect of the interaction between fast ions and magnetohydrodynamic (MHD) instabilities is the fast ion transport. Coupled kink and tearing MHD instabilities have also been reported to cause fast ion transport. Recently, the ''kick\" model has been developed to compute the evolution of the fast ion distribution from the neutral beam injection using instabilities as phase space resonance sources. The goal of this paper is to utilize the kick model to understand the physics of fast ion transport caused by the coupled kink and tearing modes. Soft X-ray diagnostics are used to identify the mode parameters in NSTX. The comparison of neutron rates measured and computed from time-dependent TRANSP simulation with the kick model shows the coupling of kink and tearing mode is important in determination of the fast ion transport. The numerical scan of the mode parameters shows that the relative phase of the kink and tearing modes and the overlapping of kink and tearing mode resonances in the phase space can affect the fast ion transport, suggesting that the synergy of the coupled modes may be causing the fast ion transpor", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Physics and Controlled Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "Energetic Particles", "language": "en_US" }, { "key": "dc.subject", "value": "Tearing Modes", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamak Transport", "language": "en_US" }, { "key": "dc.subject", "value": "Kick Model", "language": "en_US" }, { "key": "dc.title", "value": "Synergy of Coupled Kink and Tearing Modes in Fast Ion Transport", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 108970, "name": "Inversion technique to obtain local ion temperature profiles for an axisymmetric plasma with toroidal and radial velocities", "handle": "88435/dsp01r207ts405", "type": "item", "link": "/rest/items/108970", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-02-26 15:50:13.921", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Bell, Ronald E.", "language": "" }, { "key": "dc.date.accessioned", "value": "2021-02-26T20:50:13Z", "language": null }, { "key": "dc.date.available", "value": "2021-02-26T20:50:13Z", "language": null }, { "key": "dc.date.issued", "value": "2021-02", "language": "" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01r207ts405", "language": null }, { "key": "dc.description.abstract", "value": "A matrix inversion technique is derived to calculate local ion temperature from line-integrated measurements of an extended emission source in an axisymmetric plasma which exactly corrects for both toroidal velocity and radial velocity components. Local emissivity and toroidal velocity can be directly recovered from line-integrated spectroscopic measurements, but an independent measurement of the radial velocity is necessary to complete the temperature inversion. The extension of this technique to handle the radial velocity is relevant for magnetic reconnection and merging compression devices where temperature inversion from spectroscopic measurements is desired. A simulation demonstrates the effects of radial velocity on the determination of ion temperature.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Physics and Controlled Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "tomographic inversion", "language": "en_US" }, { "key": "dc.subject", "value": "ion temperature", "language": "en_US" }, { "key": "dc.subject", "value": "radial velocity", "language": "en_US" }, { "key": "dc.subject", "value": "plasma spectroscopy", "language": "en_US" }, { "key": "dc.subject", "value": "magnetic reconnection", "language": "en_US" }, { "key": "dc.subject", "value": "merging compression", "language": "en_US" }, { "key": "dc.title", "value": "Inversion technique to obtain local ion temperature profiles for an axisymmetric plasma with toroidal and radial velocities", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 109073, "name": "The updated ITPA global H-mode confinement database: description and analysis", "handle": "88435/dsp01m900nx49h", "type": "item", "link": "/rest/items/109073", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-03-02 15:05:27.464", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Verdoolaege, G.", "language": null }, { "key": "dc.contributor.author", "value": "Kaye, S.M.", "language": null }, { "key": "dc.contributor.author", "value": "Angioni, C.", "language": null }, { "key": "dc.contributor.author", "value": "Kardaunn, O.W.J.F.", "language": null }, { "key": "dc.contributor.author", "value": "Maslov, M.", "language": null }, { "key": "dc.contributor.author", "value": "Romanelli, M.", "language": null }, { "key": "dc.contributor.author", "value": "Ryter, F.", "language": null }, { "key": "dc.contributor.author", "value": "Thomsen, K.", "language": null }, { "key": "dc.date.accessioned", "value": "2021-03-01T14:38:57Z", "language": null }, { "key": "dc.date.available", "value": "2021-03-01T14:38:57Z", "language": null }, { "key": "dc.date.issued", "value": "2021-03", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01m900nx49h", "language": null }, { "key": "dc.description.abstract", "value": "The multi-machine ITPA Global H-mode Confinement Database has been upgraded with new data from JET with the ITER-like wall and ASDEX Upgrade with the full tungsten wall. This paper describes the new database and presents results of regression analysis to estimate the global energy confinement scaling in H-mode plasmas using a standard power law. Various subsets of the database are considered, focusing on type of wall and divertor materials, confinement regime (all H-modes, ELMy H or ELM-free) and ITER-like constraints. Apart from ordinary least squares, two other, robust regression techniques are applied, which take into account uncertainty on all variables. Regression on data from individual devices shows that, generally, the confinement dependence on density and the power degradation are weakest in the fully metallic devices. Using the multi-machine scalings, predictions are made of the confinement time in a standard ELMy H-mode scenario in ITER. The uncertainty on the scaling parameters is discussed with a view to practically useful error bars on the parameters and predictions. One of the derived scalings for ELMy H-modes on an ITER-like subset is studied in particular and compared to the IPB98(y,2) confinement scaling in engineering and dimensionless form. Transformation of this new scaling from engineering variables to dimensionless quantities is shown to result in large error bars on the dimensionless scaling. Regression analysis in the space of dimensionless variables is therefore proposed as an alternative, yielding acceptable estimates for the dimensionless scaling. The new scaling, which is dimensionally correct within the uncertainties, suggests that some dependencies of confinement in the multi- machine database can be reconciled with parameter scans in individual devices. This includes vanishingly small dependence of confinement on line-averaged density and normalized plasma pressure (\u03b2), as well as a noticeable, positive dependence on effective atomic mass and plasma triangularity. Extrapolation of this scaling to ITER yields a somewhat lower confinement time compared to the IPB98(y, 2) prediction, possibly related to the considerably weaker dependence on major radius in the new scaling (slightly above linear). Further studies are needed to compare more flexible regression models with the power law used here. In addition, data from more devices concerning possible \u2018hidden variables\u2019 could help to determine their influence on confinement, while adding data in sparsely populated areas of the parameter space may contribute to further disentangling some of the global confinement dependencies in tokamak plasmas.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Database in Excel format and variable definitions (short list in Word, more detailed definitions in PDF).", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion, 2021", "language": "en_US" }, { "key": "dc.subject", "value": "H-Mode", "language": "en_US" }, { "key": "dc.subject", "value": "Database", "language": "en_US" }, { "key": "dc.subject", "value": "ITER", "language": "en_US" }, { "key": "dc.title", "value": "The updated ITPA global H-mode confinement database: description and analysis", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kaye, Stanley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 110065, "name": "A software package for plasma facing component analysis and\ndesign: the Heat flux Engineering Analysis Toolkit (HEAT)", "handle": "88435/dsp01x920g0924", "type": "item", "link": "/rest/items/110065", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-03-26 16:21:13.701", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Looby, Tom", "language": "" }, { "key": "dc.contributor.author", "value": "Reinke, Matthew", "language": "" }, { "key": "dc.contributor.author", "value": "Wingen, Andreas", "language": "" }, { "key": "dc.contributor.author", "value": "Menard, Jonathan", "language": "" }, { "key": "dc.contributor.author", "value": "Gerhardt, Stefan", "language": "" }, { "key": "dc.contributor.author", "value": "Gray, Travis", "language": "" }, { "key": "dc.contributor.author", "value": "Donovan, David", "language": "" }, { "key": "dc.contributor.author", "value": "Unterberg, Ezekial", "language": "" }, { "key": "dc.contributor.author", "value": "Klabacha, Jonathan", "language": "" }, { "key": "dc.contributor.author", "value": "Messineo, Mike", "language": "" }, { "key": "dc.date.accessioned", "value": "2021-03-26T20:21:12Z", "language": null }, { "key": "dc.date.available", "value": "2021-03-26T20:21:12Z", "language": null }, { "key": "dc.date.issued", "value": "2021-03", "language": "" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01x920g0924", "language": null }, { "key": "dc.description.abstract", "value": "The engineering limits of plasma facing components (PFCs) constrain the allowable operational space of tokamaks. Poorly managed heat fluxes that push the PFCs beyond their limits not only degrade core plasma performance via elevated impurities, but can also result in PFC failure due to thermal stresses or melting. Simple axisymmetric assumptions fail to capture the complex interaction between 3D PFC geometry and 2D or 3D plasmas. This results in fusion systems that must either operate with increased risk or reduce PFC loads, potentially through lower core plasma performance, to maintain a nominal safety factor. High precision 3D heat flux predictions are necessary to accurately ascertain the state of a PFC given the evolution of the magnetic equilibrium. A new code, the Heat flux Engineering Analysis Toolkit (HEAT), has been developed to provide high precision 3D predictions and analysis for PFCs. HEAT couples many otherwise disparate computational tools together into a single open source python package. Magnetic equilibrium, engineering CAD, finite volume solvers, scrape off layer plasma physics, visualization, high performace computing, and more, are connected in a single web-based user interface. Linux users may use HEAT without any software prerequisites via an appImage. This manuscript introduces HEAT, discusses the software architecture, presents first HEAT results, and outlines physics modules in development.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Fusion Science and Technology", "language": "en_US" }, { "key": "dc.subject", "value": "fusion", "language": "en_US" }, { "key": "dc.subject", "value": "magnetic confinement", "language": "en_US" }, { "key": "dc.subject", "value": "divertor physics", "language": "en_US" }, { "key": "dc.subject", "value": "tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "heat", "language": "en_US" }, { "key": "dc.subject", "value": "python", "language": "en_US" }, { "key": "dc.title", "value": "A software package for plasma facing component analysis and\ndesign: the Heat flux Engineering Analysis Toolkit (HEAT)", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 120524, "name": "Novel 2D velocity estimation method for large transient events in plasmas", "handle": "88435/dsp01w3763987d", "type": "item", "link": "/rest/items/120524", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-07-29 10:57:42.795", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Mate, Lampert", "language": null }, { "key": "dc.contributor.author", "value": "Mate, Lampert", "language": null }, { "key": "dc.contributor.author", "value": "Ahmed, Diallo", "language": null }, { "key": "dc.contributor.author", "value": "Stewart, Zweben", "language": null }, { "key": "dc.date.accessioned", "value": "2021-07-29T14:57:42Z", "language": null }, { "key": "dc.date.available", "value": "2021-07-29T14:57:42Z", "language": null }, { "key": "dc.date.issued", "value": "2021-07-31", "language": null }, { "key": "dc.identifier.citation", "value": "M. Lampert, A. Diallo and S. J. Zweben, 2021, Supporting data for \"Novel 2D velocity estimation method for large transient events in plasmas\", Princeton Plasma Physics Laboratory, Princeotn University DataSpace, ARK #", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01w3763987d", "language": null }, { "key": "dc.description.abstract", "value": "The dataset includes the data shown in the figures of the publication", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "The data files are named after the corresponding figures with the convention of having the sub-figures in a separate file, e.g., figure_6a.txt, figure_6b.txt, etc.Figure 8 contains 9 subfigures, which are named figure_8_yx.txt where x stands for the culomn (1-3) and y stands for the row.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.source", "value": "2010 NSTX Gas Puff Imaging data", "language": "en_US" }, { "key": "dc.subject", "value": "correlation", "language": "en_US" }, { "key": "dc.subject", "value": "velocimetry", "language": "en_US" }, { "key": "dc.subject", "value": "imaging", "language": "en_US" }, { "key": "dc.subject", "value": "fusion", "language": "en_US" }, { "key": "dc.title", "value": "Novel 2D velocity estimation method for large transient events in plasmas", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Mate, Lampert", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 126899, "name": "Prototype tests of the Electromagnetic Particle Injector-2 for Fast Time Response Disruption Mitigation in Tokamaks", "handle": "88435/dsp013j3335393", "type": "item", "link": "/rest/items/126899", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 10:58:36.691", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Raman, Roger", "language": null }, { "key": "dc.contributor.author", "value": "Raman, Roger", "language": null }, { "key": "dc.contributor.author", "value": "Lunsford, Robert", "language": null }, { "key": "dc.contributor.author", "value": "Clauser, C.F.", "language": null }, { "key": "dc.contributor.author", "value": "Jardin, S.C", "language": null }, { "key": "dc.contributor.author", "value": "Menard, J.E.", "language": null }, { "key": "dc.contributor.author", "value": "Ono, M.", "language": null }, { "key": "dc.date.accessioned", "value": "2021-10-19T12:05:50Z", "language": null }, { "key": "dc.date.available", "value": "2021-10-19T12:05:50Z", "language": null }, { "key": "dc.date.issued", "value": "2021", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp013j3335393", "language": null }, { "key": "dc.description.tableofcontents", "value": "Figure 1\r\n\r\nFigure 2\r\n\r\nFigure 3\r\n\r\nFig4a.csv\r\n\r\nFig4b.csv\r\n\r\nFig4c.csv\r\n\r\nFig4d.csv\r\n\r\nFigure 5\r\n\r\nFig6.csv\r\n\r\nFig7a.csv\r\n\r\nFig7b.csv\r\n\r\nFig7c.csv\r\n\r\nFig7d.csv\r\n\r\nFig8a.csv\r\n\r\nFig8b.csv\r\n\r\nFig8c.csv\r\n\r\nFig8d.csv", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/ac30ca", "language": "en_US" }, { "key": "dc.subject", "value": "EPI", "language": "en_US" }, { "key": "dc.subject", "value": "disruption", "language": "en_US" }, { "key": "dc.subject", "value": "DMS", "language": "en_US" }, { "key": "dc.subject", "value": "particle injector", "language": "en_US" }, { "key": "dc.title", "value": "Prototype tests of the Electromagnetic Particle Injector-2 for Fast Time Response Disruption Mitigation in Tokamaks", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Raman, Roger", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "DE-SC0006757", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 128661, "name": "Development of a reduced model for energetic particle transport by sawteeth in tokamaks", "handle": "88435/dsp013197xq19q", "type": "item", "link": "/rest/items/128661", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 10:53:23.702", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Podesta, Mario", "language": null }, { "key": "dc.date.accessioned", "value": "2021-11-11T20:04:27Z", "language": null }, { "key": "dc.date.available", "value": "2021-11-11T20:04:27Z", "language": null }, { "key": "dc.date.issued", "value": "2021-11-09", "language": null }, { "key": "dc.identifier.citation", "value": "Podesta, 2021, Development of a reduced model for energetic particle transport by sawteeth in tokamaks, Princeton Plasma Physics Laboratory, Princeotn University DataSpace, 88435/dsp018p58pg29j", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp013197xq19q", "language": null }, { "key": "dc.description.tableofcontents", "value": "Each file in the dataset refers to a figure in the manuscript, with a common prefix and a suffix that points to a specific figure.For example, the file sw21_poincare_fig4.txt contains data for figure 4 in the manuscript. Data are given in ascii format, with headers for each set of data describing the format and units for the different variables.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Podesta et al 2021 Plasma Phys. Control. Fusion https://doi.org/10.1088/1361-6587/ac37fe", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1361-6587/ac37fe", "language": "en_US" }, { "key": "dc.title", "value": "Development of a reduced model for energetic particle transport by sawteeth in tokamaks", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Podesta, Mario", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 126327, "name": "Predicting Resistive Wall Mode Stability in NSTX through Balanced Random Forests and Counterfactual Explanations", "handle": "88435/dsp015q47rr88m", "type": "item", "link": "/rest/items/126327", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 11:04:19.548", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Piccione, Andrea", "language": null }, { "key": "dc.contributor.author", "value": "Sabbagh, Steven", "language": null }, { "key": "dc.contributor.author", "value": "Andreopoulos, Yiannis", "language": null }, { "key": "dc.date.accessioned", "value": "2021-12-07T14:30:00Z", "language": null }, { "key": "dc.date.available", "value": "2021-12-07T14:30:00Z", "language": null }, { "key": "dc.date.issued", "value": "2021", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp015q47rr88m", "language": null }, { "key": "dc.description.tableofcontents", "value": "Consult readme.txt", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/ac44af", "language": "en_US" }, { "key": "dc.title", "value": "Predicting Resistive Wall Mode Stability in NSTX through Balanced Random Forests and Counterfactual Explanations", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Berkery, John", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-SC0018623", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 136440, "name": "Nonlinear growth of magnetic islands by passing fast ions in NSTX", "handle": "88435/dsp01pz50h025c", "type": "item", "link": "/rest/items/136440", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 11:13:47.809", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Yang, James", "language": "en_US" }, { "key": "dc.contributor.author", "value": "Fredrickson, Eric", "language": "en_US" }, { "key": "dc.contributor.author", "value": "Podest\u00e0, Mario", "language": "en_US" }, { "key": "dc.contributor.author", "value": "Poli, Francesca", "language": "en_US" }, { "key": "dc.date.accessioned", "value": "2022-07-13T19:16:19Z", "language": null }, { "key": "dc.date.available", "value": "2022-07-13T19:16:19Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01pz50h025c", "language": null }, { "key": "dc.description.abstract", "value": "The growth of magnetic islands in NSTX is modeled successfully, with the consideration of passing fast ions. It is shown that a good quantitative agreement between simulation and experimental measurement can be achieved when the uncompensated cross-field current induced by passing fast ions is included in the island growth model. The fast ion parameters,\r\nalong with other equilibrium parameters, are obtained self-consistently using the TRANSP code with the assumptions of the \u2018kick\u2019 model (Podest\u00e0 et al 2017 Plasma Phys. Control. Fusion 59 095008). The results show that fast ions can contribute to overcoming the stabilizing effect of polarization current for magnetic island growth.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "IDL scripts (12), one for each figures, complete with save files that contains the data and plot specifications. Converted to ASCII format (see /save/).", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1361-6587/ac7970", "language": "en_US" }, { "key": "dc.subject", "value": "Fast ions", "language": "en_US" }, { "key": "dc.subject", "value": "neoclassical tearing modes", "language": "en_US" }, { "key": "dc.subject", "value": "kick model", "language": "en_US" }, { "key": "dc.subject", "value": "NSTX", "language": "en_US" }, { "key": "dc.title", "value": "Nonlinear growth of magnetic islands by passing fast ions in NSTX", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Yang, James", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dcterms.isReferencedBy", "value": "10.1088/1361-6587/ac7970", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 148405, "name": "Parametric dependencies of resonant layer responses across linear, two-fluid, drift-MHD regimes", "handle": "88435/dsp0170795b825", "type": "item", "link": "/rest/items/148405", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-07-26 13:47:59.118", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Park, Jong-Kyu", "language": null }, { "key": "dc.contributor.author", "value": "Park, Jong-Kyu", "language": null }, { "key": "dc.date.accessioned", "value": "2022-07-26T17:47:58Z", "language": null }, { "key": "dc.date.available", "value": "2022-07-26T17:47:58Z", "language": null }, { "key": "dc.date.issued", "value": "2022-07-26", "language": null }, { "key": "dc.identifier.citation", "value": "Jong-Kyu Park, 2022, Dataset for accepted paper, Princeton Plasma Physics Laboratory", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp0170795b825", "language": null }, { "key": "dc.description.abstract", "value": "Non-axisymmetric magnetic fields arising in a tokamak either by external or internal perturbations can induce complex non-ideal MHD responses in their resonant surfaces while remaining ideally evolved elsewhere. This layer response can be characterized in a linear regime by a single parameter called the inner-layer Delta, which enables outer-layer matching and the prediction of torque balance to non-linear island regimes. Here, we follow strictly one of the most comprehensive analytic treatments including two-fluid and drift MHD effects and keep the fidelity of the formulation by incorporating the numerical method based on the Riccati transformation when quantifying the inner-layer Delta. The proposed scheme reproduces not only the predicted responses in essentially all asymptotic regimes but also with continuous transitions as well as improved accuracies. In particular, the Delta variations across the inertial regimes with viscous or semi-collisional effects have been further resolved, in comparison with additional analytic solutions. The results imply greater shielding of the electromagnetic torque at the layer than what would be expected by earlier work when the viscous or semi-collisional effects can compete against the inertial effects, and also due to the intermediate regulation by kinetic Alfven wave resonances as rotation slows down. These are important features that can alter the nonaxisymmetric plasma responses including the field penetration by external fields or island seeding process in rotating tokamak plasmas.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Dataset for figures 1-9 in the paper.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas 29, 072506 (2022)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0093079", "language": "en_US" }, { "key": "dc.source", "value": "Simulations", "language": "en_US" }, { "key": "dc.subject", "value": "MHD instability", "language": "en_US" }, { "key": "dc.title", "value": "Parametric dependencies of resonant layer responses across linear, two-fluid, drift-MHD regimes", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Park, Jong-Kyu", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 163457, "name": "Reduced Physics Model of the Tokamak Scrape-off-Layer for Pulse Design", "handle": "88435/dsp01d791sk413", "type": "item", "link": "/rest/items/163457", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-31 13:57:52.366", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zhang, Xin", "language": null }, { "key": "dc.date.accessioned", "value": "2023-01-31T14:56:40Z", "language": null }, { "key": "dc.date.available", "value": "2023-01-31T14:56:40Z", "language": null }, { "key": "dc.date.issued", "value": "2023-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01d791sk413", "language": null }, { "key": "dc.description.abstract", "value": "The dynamic interplay between the core and the edge plasma has important consequences in the confinement and heating of fusion plasma. The transport of the Scrape-Off-Layer (SOL) plasma imposes boundary conditions on the core plasma, and neutral transport through the SOL influences the core plasma sourcing. In order to better study these effects in a self-consistent, time-dependent fashion with reasonable turn-around time, a reduced model is needed. In this paper we introduce the SOL Box Model, a reduced SOL model that calculates the plasma temperature and density in the SOL given the core-to-edge particle and power fluxes and recycling coefficients. The analytic nature of the Box Model allows one to readily incorporate SOL physics in time-dependent transport solvers for pulse design applications in the control room. Here we demonstrate such a coupling with the core transport solver TRANSP and compare the results with density and temperature measurements, obtained through Thomson scattering and Langmuir probes, of an NSTX discharge. Implications for future interpretive and predictive simulations are discussed.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Materials and Energy (2023): 101354", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1016/j.nme.2022.101354", "language": null }, { "key": "dc.title", "value": "Reduced Physics Model of the Tokamak Scrape-off-Layer for Pulse Design", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Zhang, Xin", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 168795, "name": "Dataset for the letter \"Shifting and Splitting of Resonance Lines due to Dynamical Friction in Plasmas\" Phys. Rev. Lett. 130, 105101 (2023)", "handle": "88435/dsp011831cp19m", "type": "item", "link": "/rest/items/168795", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-04-19 10:57:51.947", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Duarte, Vinicius", "language": null }, { "key": "dc.date.accessioned", "value": "2023-04-13T13:58:15Z", "language": null }, { "key": "dc.date.available", "value": "2023-04-13T13:58:15Z", "language": null }, { "key": "dc.date.issued", "value": "2023", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp011831cp19m", "language": null }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "V.\u2009N. Duarte, J.\u2009B. Lestz, N.\u2009N. Gorelenkov, and R.\u2009B. White, Phys. Rev. Lett. 130, 105101 (2023)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1103/PhysRevLett.130.105101", "language": null }, { "key": "dc.title", "value": "Dataset for the letter \"Shifting and Splitting of Resonance Lines due to Dynamical Friction in Plasmas\" Phys. Rev. Lett. 130, 105101 (2023)", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Duarte, Vinicius", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 168941, "name": "3D full wave fast wave modeling with realistic HHFW antenna geometry and SOL plasma in NSTX-U", "handle": "88435/dsp01wh246w38h", "type": "item", "link": "/rest/items/168941", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-04-19 10:55:50.809", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Bertelli, Nicola", "language": null }, { "key": "dc.contributor.author", "value": "Bertelli, Nicola", "language": null }, { "key": "dc.contributor.author", "value": "Shiraiwa, Syun'ichi", "language": null }, { "key": "dc.contributor.author", "value": "Ono, Masayuki", "language": null }, { "key": "dc.date.accessioned", "value": "2023-04-13T14:01:04Z", "language": null }, { "key": "dc.date.available", "value": "2023-04-13T14:01:04Z", "language": null }, { "key": "dc.date.issued", "value": "2022-10-27", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01wh246w38h", "language": null }, { "key": "dc.description.tableofcontents", "value": "See readme.txt file", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion, 2022, 62, 12, 126046", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/ac9690", "language": null }, { "key": "dc.subject", "value": "HHFW, 3D RF modeling, Petra-M, fast wave, NSTX-U", "language": "en_US" }, { "key": "dc.title", "value": "3D full wave fast wave modeling with realistic HHFW antenna geometry and SOL plasma in NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Bertelli, Nicola", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 105871, "name": "Geometric concepts for stellarator permanent magnet arrays", "handle": "88435/dsp01db78tg01d", "type": "item", "link": "/rest/items/105871", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-09-03 09:09:21.629", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Hammond, K. C.", "language": null }, { "key": "dc.contributor.author", "value": "Zhu, C.", "language": null }, { "key": "dc.contributor.author", "value": "Brown, T.", "language": null }, { "key": "dc.contributor.author", "value": "Corrigan, K.", "language": null }, { "key": "dc.contributor.author", "value": "Gates, D. A.", "language": null }, { "key": "dc.contributor.author", "value": "Sibilia, M.", "language": null }, { "key": "dc.date.accessioned", "value": "2020-09-03T13:09:19Z", "language": null }, { "key": "dc.date.available", "value": "2020-09-03T13:09:19Z", "language": null }, { "key": "dc.date.issued", "value": "2020-07", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01db78tg01d", "language": null }, { "key": "dc.description.abstract", "value": "The development of stellarators that use permanent magnet arrays to shape their confining magnetic fields has been a topic of recent interest, but the requirements for how such magnets must be shaped, manufactured, and assembled remain to be determined. To address these open questions, we have performed a study of geometric concepts for magnet arrays with the aid of the newly developed MAGPIE code. A proposed experiment similar to the National Compact Stellarator Experiment (NCSX) is used as a test case. Two classes of magnet geometry are explored: curved bricks that conform to a regular grid in cylindrical coordinates, and hexahedra that conform to the toroidal plasma geometry. In addition, we test constraints on the magnet polarization. While magnet configurations constrained to be polarized normally to a toroidal surface around the plasma are unable to meet the required magnetic field parameters when subject to physical limitations on the strength of present-day magnets, configurations with unconstrained polarizations are shown to satisfy the physics requirements for a targeted plasma.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion 60, 106010 (2020)", "language": "en_US" }, { "key": "dc.subject", "value": "stellarator, permanent magnet, optimization", "language": "en_US" }, { "key": "dc.title", "value": "Geometric concepts for stellarator permanent magnet arrays", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.depositor", "value": "Hammond, Kenneth", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 108744, "name": "First impurity powder injection experiments in LHD", "handle": "88435/dsp01sx61dq35f", "type": "item", "link": "/rest/items/108744", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-11-23 08:59:59.829", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Nespoli F., Ashikawa N., Gilson E.P., Lunsford R., Masuzaki S., Shoji M., Oishi T., Suzuki C., Nagy A., Mollen A., Pablant N.A., Ida K., Yoshinuma M., Tamura N., \nGates D.A., Morisaki T., and the LHD experiment group", "language": "" }, { "key": "dc.date.accessioned", "value": "2020-11-23T13:59:58Z", "language": null }, { "key": "dc.date.available", "value": "2020-11-23T13:59:58Z", "language": null }, { "key": "dc.date.issued", "value": "2020-11", "language": "" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01sx61dq35f", "language": null }, { "key": "dc.description.abstract", "value": "Injection of impurities in the form of sub-millimeter powder grains is performed for the first time in the Large Helical Device (LHD) plasma, employing the Impurity Powder Dropper (IPD) [A. Nagy et al., RSI 2018], developed and built by PPPL. Controlled amounts of boron (B) and boron nitride (BN) powder are injected into the helical plasma. Visible camera imaging, UV and charge exchange spectroscopy measurements show that the injected impurities effectively penetrate into the plasma in two different magnetic configurations.The prompt effects of the impurities on the plasma are characterized as the injection rate is scanned. The injected impurities provide a supplemental electron source, causing the plasma density to increase, together with the radiated power. Beneficial effects on the confined plasma temperature are observed at low plasma densities, due to an increased efficiency in NBI power absorption. For $n_{e,av}<10^{19}m^{-3}$ the powder grains penetrate deeper into the plasma, as they can be less effectively deflected by the plasma flow in the divertor leg, which they have to cross first as they are injected from the top of the machine.In this case, the created B ions are observed to move outwards from UV spectroscopy and charge exchange measurements, due to the outwards direction of the radial electric field. This makes low density plasmas a better candidate for powder boronization techniques.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Materials and Energy", "language": "en_US" }, { "key": "dc.subject", "value": "Powder", "language": "en_US" }, { "key": "dc.subject", "value": "Impurity injection", "language": "en_US" }, { "key": "dc.subject", "value": "Boron", "language": "en_US" }, { "key": "dc.subject", "value": "Experiment", "language": "en_US" }, { "key": "dc.subject", "value": "Impurity Transport", "language": "en_US" }, { "key": "dc.subject", "value": "Helical plasma", "language": "en_US" }, { "key": "dc.title", "value": "First impurity powder injection experiments in LHD", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 114739, "name": "Initial operation and data processing on a system for real-time evaluation of Thomson scattering signals on the Large Helical Device", "handle": "88435/dsp014t64gr25v", "type": "item", "link": "/rest/items/114739", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-05-28 10:35:53.972", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Hammond, K. C.", "language": null }, { "key": "dc.contributor.author", "value": "Laggner, F. M.", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A.", "language": null }, { "key": "dc.contributor.author", "value": "Doskoczynski, S.", "language": null }, { "key": "dc.contributor.author", "value": "Freeman, C.", "language": null }, { "key": "dc.contributor.author", "value": "Funaba, H.", "language": null }, { "key": "dc.contributor.author", "value": "Gates, D.A.", "language": null }, { "key": "dc.contributor.author", "value": "Rozenblat, R.", "language": null }, { "key": "dc.contributor.author", "value": "Tchilinguirian, G.", "language": null }, { "key": "dc.contributor.author", "value": "Xing, Z.", "language": null }, { "key": "dc.contributor.author", "value": "Yamada, I.", "language": null }, { "key": "dc.contributor.author", "value": "Yasuhara, R.", "language": null }, { "key": "dc.contributor.author", "value": "Zimmer, G.", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, E.", "language": null }, { "key": "dc.date.accessioned", "value": "2021-05-28T14:35:53Z", "language": null }, { "key": "dc.date.available", "value": "2021-05-28T14:35:53Z", "language": null }, { "key": "dc.date.issued", "value": "2021", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp014t64gr25v", "language": null }, { "key": "dc.description.abstract", "value": "A scalable system for real-time analysis of electron temperature and density based on signals from the Thomson scattering diagnostic, initially developed for and installed on the NSTX-U experiment, was recently adapted for the Large Helical Device (LHD) and operated for the first time during plasma discharges. During its initial operation run, it routinely recorded and processed signals for four spatial points at the laser repetition rate of 30 Hz, well within the system's rated capability for 60 Hz. We present examples of data collected from this initial run and describe subsequent adaptations to the analysis code to improve the fidelity of the temperature calculations.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Please consult the file README.txt for a description of the archive contents.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.subject", "value": "Thomson scattering, real-time, LHD, plasma diagnostic", "language": "en_US" }, { "key": "dc.title", "value": "Initial operation and data processing on a system for real-time evaluation of Thomson scattering signals on the Large Helical Device", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Hammond, Kenneth", "language": null }, { "key": "dc.contributor.funder", "value": "US Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "US Department of Energy contract number DE-SC0015480", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "NIFS LHD Project grant number ULHH040", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 126951, "name": "Stellarator coil design using cubic splines for improved access on the outboard side", "handle": "88435/dsp01q811kn76d", "type": "item", "link": "/rest/items/126951", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-10-20 12:35:26.718", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Nicola, Lonigro", "language": null }, { "key": "dc.contributor.author", "value": "Zhu, Caoxiang", "language": null }, { "key": "dc.date.accessioned", "value": "2021-10-19T19:15:12Z", "language": null }, { "key": "dc.date.available", "value": "2021-10-19T19:15:12Z", "language": null }, { "key": "dc.date.issued", "value": "2021-10-20", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01q811kn76d", "language": null }, { "key": "dc.description.abstract", "value": "This is the data archive for the paper Lonigro & Zhu 2021 Nucl. Fusion https://doi.org/10.1088/1741-4326/ac2ff3.\r\nYou can reproduce all the figures in the paper using the data and plotting scripts archived in this folder.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "fig2\r\nfig3\r\nfig4\r\nfig5\r\nfig6\r\nfig7\r\nfig8\r\nfig9\r\nfig10\r\nfigA1\r\nfigA2\r\nfigA3\r\nREADME.txt", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion, 2021, https://doi.org/10.1088/1741-4326/ac2ff3", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/ac2ff3", "language": "en_US" }, { "key": "dc.subject", "value": "stellarator", "language": "en_US" }, { "key": "dc.subject", "value": "coil design", "language": "en_US" }, { "key": "dc.subject", "value": "optimization", "language": "en_US" }, { "key": "dc.subject", "value": "cubic spline", "language": "en_US" }, { "key": "dc.title", "value": "Stellarator coil design using cubic splines for improved access on the outboard side", "language": "en_US" }, { "key": "dc.type", "value": "collection", "language": "en_US" }, { "key": "pu.depositor", "value": "Zhu, Caoxiang", "language": null }, { "key": "dc.contributor.funder", "value": "U.S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 152342, "name": "Design of an arrangement of cubic magnets for a quasi-axisymmetric stellarator experiment", "handle": "88435/dsp01x059cb547", "type": "item", "link": "/rest/items/152342", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-31 14:09:33.375", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Hammond, Kenneth", "language": null }, { "key": "dc.contributor.author", "value": "Zhu, Caoxiang", "language": null }, { "key": "dc.contributor.author", "value": "Korrigan, Keith", "language": null }, { "key": "dc.contributor.author", "value": "Gates, David", "language": null }, { "key": "dc.contributor.author", "value": "Lown, Robert", "language": null }, { "key": "dc.contributor.author", "value": "Mercurio, Robert", "language": null }, { "key": "dc.contributor.author", "value": "Qian, Tony", "language": null }, { "key": "dc.contributor.author", "value": "Zarnstorff, Michael", "language": null }, { "key": "dc.date.accessioned", "value": "2022-09-06T14:49:56Z", "language": null }, { "key": "dc.date.available", "value": "2022-09-06T14:49:56Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01x059cb547", "language": null }, { "key": "dc.description.abstract", "value": "The usage of permanent magnets to shape the confining field of a stellarator has the potential to reduce or eliminate the need for non-planar coils. As a proof-of-concept for this idea, we have developed a procedure for designing an array of cubic permanent magnets that works in tandem with a set of toroidal-field coils to confine a stellarator plasma. All of the magnets in the design are constrained to have identical geometry and one of three polarization types in order to simplify fabrication while still producing sufficient field accuracy. We present some of the key steps leading to the design, including the geometric arrangement of the magnets around the device, the procedure for optimizing the polarizations according to three allowable magnet types, and the choice of magnet types to be used. We apply these methods to design an array of rare-Earth permanent magnets that can be paired with a set of planar toroidal-field coils to confine a quasi-axisymmetric plasma with a toroidal magnetic field strength of about 0.5 T on axis.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Consult the file README.txt for a more detailed description of the contents.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion, in press", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/ac906e", "language": null }, { "key": "dc.title", "value": "Design of an arrangement of cubic magnets for a quasi-axisymmetric stellarator experiment", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Hammond, Kenneth", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 158338, "name": "Energetic particle optimization of quasi-axisymmetric stellarator equilibria", "handle": "88435/dsp012n49t492r", "type": "item", "link": "/rest/items/158338", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-31 14:01:57.363", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "LeViness, Alexandra", "language": null }, { "key": "dc.contributor.author", "value": "Schmitt, John", "language": null }, { "key": "dc.contributor.author", "value": "Lazerson, Samuel", "language": null }, { "key": "dc.contributor.author", "value": "Bader, Aaron", "language": null }, { "key": "dc.contributor.author", "value": "Faber, Benjamin", "language": null }, { "key": "dc.contributor.author", "value": "Hammond, Kenneth", "language": null }, { "key": "dc.contributor.author", "value": "Gates, David", "language": null }, { "key": "dc.date.accessioned", "value": "2022-11-28T14:21:24Z", "language": null }, { "key": "dc.date.available", "value": "2022-11-28T14:21:24Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp012n49t492r", "language": null }, { "key": "dc.description.abstract", "value": "An important goal of stellarator optimization is to achieve good confinement of\r\nenergetic particles such as, in the case of a reactor, alphas created by Deuterium-Tritium\r\n(D-T) fusion. In this work, a fixed-boundary stellarator equilibrium was re-optimized for\r\nenergetic particle confinement via a two-step process: first, by minimizing deviations from quasi-axisymmetry (QA) on a single flux surface near the mid-radius, and secondly by maintaining\r\nthis improved quasi-axisymmetry while minimizing the analytical quantity \u0393C , which represents\r\nthe angle between magnetic flux surfaces and contours of J||, the second adiabatic invariant.\r\nThis was performed multiple times, resulting in a group of equilibria with significantly reduced\r\nenergetic particle losses, as evaluated by Monte Carlo simulations of alpha particles in scaled-up\r\nversions of the equilibria. This is the first time that energetic particle losses in a QA stellarator\r\nhave successfully been reduced by optimizing \u0393C . The relationship between energetic particle\r\nlosses and metrics such as QA error (Eqa) and \u0393C in this set of equilibria were examined via\r\nstatistical methods and a nearly linear relationship between volume-averaged \u0393C and prompt\r\nparticle losses was found.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Data for all figures in \"Energetic particle optimization of quasi-axisymmetric stellarator equilibria\" by LeViness et al., accepted by Nuclear Fusion 2022. Included is a file README.txt containing table of contents information.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion, in press", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/aca4e3", "language": null }, { "key": "dc.title", "value": "Energetic particle optimization of quasi-axisymmetric stellarator equilibria", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "LeViness, Alexandra", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 161552, "name": "A novel scheme for error field correction in permanent magnet stellarators", "handle": "88435/dsp011831cp18z", "type": "item", "link": "/rest/items/161552", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-31 13:59:21.687", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Rutkowski, Adam", "language": null }, { "key": "dc.contributor.author", "value": "Hammond, Kenneth", "language": null }, { "key": "dc.contributor.author", "value": "Zhu, Caoxiang", "language": null }, { "key": "dc.contributor.author", "value": "Gates, David", "language": null }, { "key": "dc.contributor.author", "value": "Chambliss, Amelia", "language": null }, { "key": "dc.date.accessioned", "value": "2023-01-06T12:52:24Z", "language": null }, { "key": "dc.date.available", "value": "2023-01-06T12:52:24Z", "language": null }, { "key": "dc.date.issued", "value": "2022-12-07", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp011831cp18z", "language": null }, { "key": "dc.description.abstract", "value": "Stellarators offer a promising path towards fusion reactors, but their design and construction are complicated by stringent tolerance requirements on highly complex 3D coils. A potential way to simplify the engineering requirements for stellarators is to use simple planar toroidal field coils along with permanent magnet arrays to generate shaping fields. In order to ensure sufficient field accuracy while minimizing engineering complexity and system cost, new techniques are required to correct the field produced by the permanent magnet arrays to within requirements set by plasma physics. This work describes a novel correction method developed for this purpose. This analysis is applied to the design of a quasi-axisymmetric stellarator that employs a combination of permanent magnets and planar toroidal field coils to generate its magnetic field. Analysis techniques and initial results using the method for error correction on a proposed permanent magnet stellarator are shown, and it is demonstrated that the method successfully meets the design requirements of the project.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "These files provide the data to reproduce plots for \"A novel scheme for error field correction in permanent magnet stellarators\"", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/aca98d", "language": null }, { "key": "dc.subject", "value": "Stellarators", "language": "en_US" }, { "key": "dc.title", "value": "A novel scheme for error field correction in permanent magnet stellarators", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Rutkowski, Adam", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 79752, "name": "A dynamic magnetic tension force as the cause of failed solar eruptions", "handle": "88435/dsp01j3860933c", "type": "item", "link": "/rest/items/79752", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2015-12-16 12:11:41.328", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Myers, Clayton", "language": null }, { "key": "dc.contributor", "value": "Yamada, Maasaki", "language": null }, { "key": "dc.contributor", "value": "Ji, Hantao", "language": null }, { "key": "dc.contributor", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor", "value": "Fox, William", "language": null }, { "key": "dc.contributor", "value": "Jara-Almonte, Jonathan", "language": null }, { "key": "dc.contributor", "value": "Savcheva, Antonia", "language": null }, { "key": "dc.contributor", "value": "DeLuca, DeLuca", "language": null }, { "key": "dc.date.accessioned", "value": "2015-12-11T17:02:19Z", "language": null }, { "key": "dc.date.available", "value": "2015-12-11T17:02:19Z", "language": null }, { "key": "dc.date.issued", "value": "2015-12-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01j3860933c", "language": null }, { "key": "dc.description.abstract", "value": "Coronal mass ejections are solar eruptions driven by a sudden release of magnetic energy stored in the Sun\u2019s corona. In many cases, this magnetic energy is stored in long-lived, arched structures called magnetic flux ropes. When a flux rope destabilizes, it can either erupt and produce a coronal mass ejection or fail and collapse back towards the Sun. The prevailing belief is that the outcome of a given event is determined by a magnetohydrodynamic force imbalance called the torus instability. This belief is challenged, however, by observations indicating that torus-unstable flux ropes sometimes fail to erupt. This contradiction has not yet been resolved because of a lack of coronal magnetic field measurements and the limitations of idealized numerical modelling. Here we report the results of a laboratory experiment that reveal a previously unknown eruption criterion below which torus-unstable flux ropes fail to erupt. We find that such \u2018failed torus\u2019 events occur when the guide magnetic field (that is, the ambient field that runs toroidally along the flux rope) is strong enough to prevent the flux rope from kinking. Under these conditions, the guide field interacts with electric currents in the flux rope to produce a dynamic toroidal field tension force that halts the eruption. This magnetic tension force is missing from existing eruption models, which is why such models cannot explain or predict failed torus events.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and data zip files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": null }, { "key": "dc.relation", "value": "Nature", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1038/nature16188", "language": "en_US" }, { "key": "dc.source", "value": "MRX experiment", "language": "en_US" }, { "key": "dc.subject", "value": "Laboratory plasma astrophysics", "language": "en_US" }, { "key": "dc.subject", "value": "Solar eruptions", "language": "en_US" }, { "key": "dc.subject", "value": "Coronal mass ejections", "language": "en_US" }, { "key": "dc.subject", "value": "Magnetohydrodynamic instabilities", "language": "en_US" }, { "key": "dc.title", "value": "A dynamic magnetic tension force as the cause of failed solar eruptions", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": "en_US" }, { "key": "pu.depositor", "value": "Stratton, Brent", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "Center for Magnetic Self-Organization", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 84767, "name": "Validation and benchmarking of two particle-in-cell codes for a glow discharge", "handle": "88435/dsp01zs25xb94r", "type": "item", "link": "/rest/items/84767", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-12-03 01:15:40.985", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Carlsson, J.", "language": null }, { "key": "dc.contributor.author", "value": "Khrabrov, A.", "language": null }, { "key": "dc.contributor.author", "value": "Kaganovich, I.", "language": null }, { "key": "dc.contributor.author", "value": "Sommerer, T.", "language": null }, { "key": "dc.contributor.author", "value": "Keating, D.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-12-02T16:56:31Z", "language": null }, { "key": "dc.date.available", "value": "2016-12-02T16:56:31Z", "language": null }, { "key": "dc.date.issued", "value": "2017", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01zs25xb94r", "language": null }, { "key": "dc.description.abstract", "value": "The two particle-in-cell codes EDIPIC and LSP are benchmarked and validated \r\nfor a parallel-plate glow discharge in helium, in which the axial electric \r\nfield had been carefully measured, primarily to investigate and improve the \r\nfidelity of their collision models. The scattering anisotropy of \r\nelectron-impact ionization, as well as the value of the secondary-electron \r\nemission yield, are not well known in this case. The experimental \r\nuncertainty for the emission yield corresponds to a factor of two variation \r\nin the cathode current. If the emission yield is tuned to make the cathode \r\ncurrent computed by each code match the experiment, the computed electric \r\nfields are in excellent agreement with each other, and within about 10% of \r\nthe experimental value. The non-monotonic variation of the width of the \r\ncathode fa ll with the applied voltage seen in the experiment is reproduced \r\nby both codes. The electron temperature in the negative glow is within \r\nexperimental error bars for both codes, but the density of slow trapped \r\nelectrons is underestimated. A more detailed code comparison don e for \r\nseveral synthetic cases of electron-beam injection into helium gas shows \r\nthat the codes are in excellent agreement for ionization rate, as well as \r\nfor elastic and excitation collisions with isotropic scattering pattern. The \r\nremaining significant discrepancies between the two codes are due to \r\ndifferences in their electron binary-collision models, and for anisotropic \r\nscattering due to elastic and excitation collisions.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Read me and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Sources Science and Technology, Volume 26, Number 1, p. 014003, 2017", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1088/0963-0252/26/1/014003", "language": "en_US" }, { "key": "dc.subject", "value": "validation", "language": "en_US" }, { "key": "dc.subject", "value": "benchmarking", "language": "en_US" }, { "key": "dc.subject", "value": "uncertainty quantification", "language": "en_US" }, { "key": "dc.subject", "value": "particle-in-cell", "language": "en_US" }, { "key": "dc.subject", "value": "Monte Carlo collisions", "language": "en_US" }, { "key": "dc.subject", "value": "glow discharge", "language": "en_US" }, { "key": "dc.title", "value": "Validation and benchmarking of two particle-in-cell codes for a glow discharge", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brentley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 90999, "name": "Effects of Axial Boundary Conductivity on a Free Stewartson-Shercliff Layer", "handle": "88435/dsp01td96k522z", "type": "item", "link": "/rest/items/90999", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-06-27 11:23:59.023", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Caspary, Kyle J.", "language": null }, { "key": "dc.contributor.author", "value": "Choi, Dahan", "language": null }, { "key": "dc.contributor.author", "value": "Ebrahimi, Fatima", "language": null }, { "key": "dc.contributor.author", "value": "Gilson, Erik P.", "language": null }, { "key": "dc.contributor.author", "value": "Goodman, Jeremy", "language": null }, { "key": "dc.contributor.author", "value": "Ji, Hantao", "language": null }, { "key": "dc.date.accessioned", "value": "2018-06-27T15:23:58Z", "language": null }, { "key": "dc.date.available", "value": "2018-06-27T15:23:58Z", "language": null }, { "key": "dc.date.issued", "value": "2018", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01td96k522z", "language": null }, { "key": "dc.description.abstract", "value": "The effects of axial boundary conductivity on the formation and stability of a magnetized free Stewartson-Shercliff layer (SSL) in a short Taylor-Couette device are reported. As the axial field increases with insulating endcaps, hydrodynamic Kelvin-Helmholtz-type instabilities set in at the SSLs of the conducting fluid, resulting in a much reduced flow shear. With conducting endcaps, SSLs respond to an axial field weaker by the square root of the conductivity ratio of endcaps to fluid. Flow shear continuously builds up as the axial field increases despite the local violation of the Rayleigh criterion, leading to a large number of hydrodynamically unstable modes. Numerical simulations of both the mean flow and the instabilities are in agreement with the experimental results.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Read me and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physical Review E, 2018, vol. 97, pages 063110-1 to 063110-5", "language": "en_US" }, { "key": "dc.subject", "value": "Magnetohydrodynamics", "language": "en_US" }, { "key": "dc.subject", "value": "Flow instability", "language": "en_US" }, { "key": "dc.subject", "value": "Laboratory studies of space & astrophysical plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "Shear flows", "language": "en_US" }, { "key": "dc.title", "value": "Effects of Axial Boundary Conductivity on a Free Stewartson-Shercliff Layer", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brent", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 84492, "name": "Laboratory study of low-beta forces in arched, line-tied magnetic flux ropes", "handle": "88435/dsp014x51hm50z", "type": "item", "link": "/rest/items/84492", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-10-29 01:11:23.888", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Myers, Clayton", "language": null }, { "key": "dc.contributor.author", "value": "Yamada, Masaaki", "language": null }, { "key": "dc.contributor.author", "value": "Ji, Hantao", "language": null }, { "key": "dc.contributor.author", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.author", "value": "Jara-Almonte, Jonathan", "language": null }, { "key": "dc.contributor.author", "value": "Fox, William", "language": null }, { "key": "dc.date.accessioned", "value": "2016-10-28T20:36:35Z", "language": null }, { "key": "dc.date.available", "value": "2016-10-28T20:36:35Z", "language": null }, { "key": "dc.date.issued", "value": "2016-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp014x51hm50z", "language": null }, { "key": "dc.description.abstract", "value": "The loss-of-equilibrium is a solar eruption mechanism whereby a sudden breakdown of the magnetohydrodynamic force balance in the Sun's corona ejects a massive burst of particles and energy into the heliosphere. Predicting a loss-of-equilibrium, which has more recently been formulated as the torus instability, relies on a detailed understanding of the various forces that hold the pre-eruption magnetic flux rope in equilibrium. Traditionally, idealized analytical force expressions are used to derive simplified eruption criteria that can be compared to solar observations and modeling. What is missing, however, is a validation that these idealized analytical force expressions can be applied to the line-tied, low-aspect-ratio conditions of the corona. In this paper, we address this shortcoming by using a laboratory experiment to study the forces that act on long-lived, arched, line-tied magnetic flux ropes. Three key force terms are evaluated over a wide range of experimental conditions: (1) the upward hoop force; (2) the downward strapping force; and (3) the downward toroidal field tension force. First, the laboratory force measurements show that, on average, the three aforementioned force terms cancel to produce a balanced line-tied equilibrium. This finding validates the laboratory force measurement techniques developed here, which were recently used to identify a dynamic toroidal field tension force that can prevent flux rope eruptions [Myers et al., Nature 528, 526 (2015)]. The verification of magnetic force balance also confirms the low-beta assumption that the plasma thermal pressure is negligible in these experiments. Next, the measured force terms are directly compared to their corresponding analytical expressions. While the measured and analytical forces are found to be well correlated, the low-aspect-ratio, line-tied conditions in the experiment are found to both reduce the measured hoop force and increase the measured tension force with respect to analytical expectations. These two co-directed effects combine to generate laboratory flux rope equilibria at lower altitudes than are predicted analytically. Such considerations are expected to modify the loss-of-equilibrium eruption criteria for analogous flux ropes in the solar corona.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Read me and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4966691", "language": "en_US" }, { "key": "dc.subject", "value": "Laboratory Astrophysics", "language": "en_US" }, { "key": "dc.subject", "value": "Solar Eruptions", "language": "en_US" }, { "key": "dc.subject", "value": "Magnetohydrodynamic Equilibrium", "language": "en_US" }, { "key": "dc.title", "value": "Laboratory study of low-beta forces in arched, line-tied magnetic flux ropes", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brentley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "National Science Foundation/Department of Energy Center for Magnetic Self-Organization", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 89468, "name": "Demonstrating electromagnetic control of free-surface, liquid-metal flows relevant to fusion reactors", "handle": "88435/dsp01c534fr60f", "type": "item", "link": "/rest/items/89468", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-01-04 04:05:31.108", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Hvasta, M. G.", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, E.", "language": null }, { "key": "dc.contributor.author", "value": "Fisher, A. E.", "language": null }, { "key": "dc.contributor.author", "value": "Ji, H.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-01-03T18:05:48Z", "language": null }, { "key": "dc.date.available", "value": "2018-01-03T18:05:48Z", "language": null }, { "key": "dc.date.issued", "value": "2018-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01c534fr60f", "language": null }, { "key": "dc.description.abstract", "value": "Plasma-facing components (PFC's) made from solid materials may not be able to withstand the large heat and particle fluxes that will be produced within next-generation fusion reactors. To address the shortcomings of solid PFC's, a variety of liquid-metal (LM) PFC concepts have been proposed. Many of the suggested LM-PFC designs rely on electromagnetic restraint (Lorentz force) to keep free-surface, liquid-metal flows adhered to the interior surfaces of a fusion reactor. However, there is very little, if any, experimental data demonstrating that free-surface, LM-PFC's can actually be electromagnetically controlled. Therefore, in this study, electrical currents were injected into a free-surface liquid-metal that was flowing through a uniform magnetic field. The resultant Lorentz force generated within the liquid-metal affected the velocity and depth of the flow in a controllable manner that closely matched theoretical predictions. These results show the promise of electromagnetic control for LM-PFC's and suggest that electromagnetic control could be further developed to adjust liquid-metal nozzle output, prevent splashing within a tokamak, and alter heat transfer properties for a wide-range of liquid-metal systems.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Read me and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion, 58 (2018) 016022", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/aa9344", "language": "en_US" }, { "key": "dc.subject", "value": "Electromagnetic Control", "language": "en_US" }, { "key": "dc.subject", "value": "Galinstan", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma-Facing Component", "language": "en_US" }, { "key": "dc.title", "value": "Demonstrating electromagnetic control of free-surface, liquid-metal flows relevant to fusion reactors", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brent", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 95011, "name": "Physics design for a lithium vapor box divertor experiment on Magnum-PSI", "handle": "88435/dsp01h702q9164", "type": "item", "link": "/rest/items/95011", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-03-05 04:13:25.296", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Schwartz, Jacob", "language": null }, { "key": "dc.contributor.author", "value": "Emdee, Eric", "language": null }, { "key": "dc.contributor.author", "value": "Goldston, Robert", "language": null }, { "key": "dc.contributor.author", "value": "Jaworski, Michael", "language": null }, { "key": "dc.date.accessioned", "value": "2019-03-04T20:55:51Z", "language": null }, { "key": "dc.date.available", "value": "2019-03-04T20:55:51Z", "language": null }, { "key": "dc.date.issued", "value": "2019-01-30", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01h702q9164", "language": null }, { "key": "dc.description.abstract", "value": "The lithium vapor box divertor is a potential solution for power exhaust in toroidal confinement devices. The divertor plasma interacts with a localized, dense cloud of lithium vapor, leading to volumetric radiation, cooling, recombination, and detachment. To minimize contamination of the core plasma, lithium vapor is condensed on cool (300\u00b0C to 400\u00b0C) baffles upstream of the detachment point. Before implementing this in a toroidal plasma device with a slot divertor geometry, we consider an experiment with a scaled baffled-pipe geometry in the high-power linear plasma device Magnum-PSI. Three 15 cm-scale open cylinders joined by 6 cm diameter \u2018nozzles\u2019 are positioned on the plasma beam axis upstream of a target. The central box may be loaded with several tens of grams of lithium, which can be evaporated at 650\u00b0C to produce a vapor predicted, using a simple plasma-neutral interaction model, to be dense enough to cause volumetric detachment in the plasma. The power delivered to the target and box walls as measured by increases in their temperatures after a 10 s plasma pulse can be compared to determine the effectiveness of the vapor in detaching the plasma. Direct Simulation Monte Carlo simulations are performed to estimate the flow rates of lithium vapor between the boxes and to estimate the trapping of H2 delivered by the plasma in the boxes, which could inadvertently lead to detachment. Details of the geometry, simulations, and possible diagnostic techniques are presented.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Read me and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Materials and Energy, Volume 18, January 2019, Pages 350-355", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1016/j.nme.2019.01.024", "language": "en_US" }, { "key": "dc.subject", "value": "divertor", "language": "en_US" }, { "key": "dc.subject", "value": "lithium vapor", "language": "en_US" }, { "key": "dc.title", "value": "Physics design for a lithium vapor box divertor experiment on Magnum-PSI", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brentley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 88248, "name": "Electron heating and energy inventory during asymmetric reconnection in a laboratory plasma", "handle": "88435/dsp01jd4730105", "type": "item", "link": "/rest/items/88248", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-08-10 14:38:41.732", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.author", "value": "Na, Byungkeun", "language": null }, { "key": "dc.contributor.author", "value": "Jara-Almonte, Jonathan", "language": null }, { "key": "dc.contributor.author", "value": "Yamada, Maasaki", "language": null }, { "key": "dc.contributor.author", "value": "Ji, Hantao", "language": null }, { "key": "dc.contributor.author", "value": "Roytershteyn, V.", "language": null }, { "key": "dc.contributor.author", "value": "Argall, M. R.", "language": null }, { "key": "dc.contributor.author", "value": "Fox, W.", "language": null }, { "key": "dc.contributor.author", "value": "Chen, Li-Jen", "language": null }, { "key": "dc.date.accessioned", "value": "2017-08-10T18:38:41Z", "language": null }, { "key": "dc.date.available", "value": "2017-08-10T18:38:41Z", "language": null }, { "key": "dc.date.issued", "value": "2017-08", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01jd4730105", "language": null }, { "key": "dc.description.abstract", "value": "Electron heating and the energy inventory during asymmetric reconnection are studied in the laboratory plasma with a density ratio of about 8 across the current sheet. Features of asymmetric reconnection such as the large density gradients near the low-density-side separatrices, asymmetric in-plane electric field, and bipolar out-of-plane magnetic field are observed. Unlike the symmetric case, electrons are also heated near the low-density-side separatrices. The measured parallel electric field may explain the observed electron heating. Although large fluctuations driven by lower-hybrid drift instabilities are also observed near the low-density-side separatrices, laboratory measurements and numerical simulations reported here suggest that they do not play a major role in electron energization. The average electron temperature increase in the exhaust region is proportional to the incoming magnetic energy per an electron/ion pair but exceeds scalings of the previous space observations. This discrepancy is explained by differences in the boundary condition and system size. The profile of electron energy gain from the electric field shows that there is additional electron energy gain associated with the electron diamagnetic current besides a large energy gain near the X-line. This additional energy gain increases electron enthalpy, not the electron temperature. Finally, a quantitative analysis of the energy inventory during asymmetric reconnection is conducted. Unlike the symmetric case where the ion energy gain is about twice more than the electron energy gain, electrons and ions obtain a similar amount of energy during asymmetric reconnection.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Journal of Geophysical Research-Space Physics, 2017", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "DOI: 10.1002/2017JA024152", "language": "en_US" }, { "key": "dc.subject", "value": "Reconnection", "language": "en_US" }, { "key": "dc.subject", "value": "Electron heating", "language": "en_US" }, { "key": "dc.subject", "value": "Laboratory plasma", "language": "en_US" }, { "key": "dc.subject", "value": "Energy inventory", "language": "en_US" }, { "key": "dc.title", "value": "Electron heating and energy inventory during asymmetric reconnection in a laboratory plasma", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brentley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 92747, "name": "Whistler wave generation by anisotropic tail electrons during asymmetric magnetic reconnection in space and laboratory", "handle": "88435/dsp01t148fk89s", "type": "item", "link": "/rest/items/92747", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-08-24 04:09:47.377", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.author", "value": "Jara-almonte, J.", "language": null }, { "key": "dc.contributor.author", "value": "Yerger, Evan", "language": null }, { "key": "dc.contributor.author", "value": "Wang, Shan", "language": null }, { "key": "dc.contributor.author", "value": "Qian, Tony", "language": null }, { "key": "dc.contributor.author", "value": "Le, Ari", "language": null }, { "key": "dc.contributor.author", "value": "Ji, Hantao", "language": null }, { "key": "dc.contributor.author", "value": "Yamada, Masaaki", "language": null }, { "key": "dc.contributor.author", "value": "Fox, William", "language": null }, { "key": "dc.contributor.author", "value": "Kim, Eun-Hwa", "language": null }, { "key": "dc.contributor.author", "value": "Chen, Li-Jen", "language": null }, { "key": "dc.contributor.author", "value": "Gershman, Daniel", "language": null }, { "key": "dc.date.accessioned", "value": "2018-08-23T15:24:06Z", "language": null }, { "key": "dc.date.available", "value": "2018-08-23T15:24:06Z", "language": null }, { "key": "dc.date.issued", "value": "2018-08", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01t148fk89s", "language": null }, { "key": "dc.description.abstract", "value": "Whistler wave generation near the magnetospheric separatrix during reconnection at the dayside magnetopause is studied with data from the Magnetospheric Multiscale (MMS) mission. The dispersion relation of the whistler mode is measured for the first time near the reconnection region in space, which shows that whistler waves propagate nearly parallel to the magnetic field line. A linear analysis indicates that the whistler waves are generated by temperature anisotropy in the electron tail population. This is caused by loss of electrons with a high velocity parallel to the magnetic field to the exhaust region. There is a positive correlation between activities of whistler waves and the lower-hybrid drift instability (LHDI) both in laboratory and space, indicating the enhanced transport by LHDI may be responsible for the loss of electrons with a high parallel velocity.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Readme and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Geophysical Research Letters, August, 2018", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1029/2018GL079278", "language": "en_US" }, { "key": "dc.subject", "value": "Whistler wave", "language": "en_US" }, { "key": "dc.subject", "value": "Dispersion relation", "language": "en_US" }, { "key": "dc.subject", "value": "Temperature anisotropy", "language": "en_US" }, { "key": "dc.subject", "value": "Magnetic reconnection", "language": "en_US" }, { "key": "dc.subject", "value": "Lower\u2010hybrid drift instability", "language": "en_US" }, { "key": "dc.title", "value": "Whistler wave generation by anisotropic tail electrons during asymmetric magnetic reconnection in space and laboratory", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brent", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 83427, "name": "Hydrogen Retention in Lithium on Metallic Walls from \u201cIn Vacuo\u201d Analysis in LTX and Implications for High-Z Plasma-Facing Components in NSTX-U", "handle": "88435/dsp01cc08hj11w", "type": "item", "link": "/rest/items/83427", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-11-18 01:12:40.287", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Kaita, R.", "language": null }, { "key": "dc.contributor.author", "value": "Lucia, M.", "language": null }, { "key": "dc.contributor.author", "value": "Allain, J. P.", "language": null }, { "key": "dc.contributor.author", "value": "Bedoya, F.", "language": null }, { "key": "dc.contributor.author", "value": "Capece, A.", "language": null }, { "key": "dc.contributor.author", "value": "Jaworski, M.", "language": null }, { "key": "dc.contributor.author", "value": "Koel, B. E.", "language": null }, { "key": "dc.contributor.author", "value": "Majeski, R.", "language": null }, { "key": "dc.contributor.author", "value": "Roszell, J.", "language": null }, { "key": "dc.contributor.author", "value": "Schmitt, J.", "language": null }, { "key": "dc.contributor.author", "value": "Scotti, F.", "language": null }, { "key": "dc.contributor.author", "value": "Skinner, C. H.", "language": null }, { "key": "dc.contributor.author", "value": "Soukhanovskii, V.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-11-17T21:33:58Z", "language": null }, { "key": "dc.date.available", "value": "2016-11-17T21:33:58Z", "language": null }, { "key": "dc.date.issued", "value": "2016", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01cc08hj11w", "language": null }, { "key": "dc.description.abstract", "value": "The application of lithium to plasma-facing components (PFCs) has long been used as a technique for wall conditioning in magnetic confinement devices to improve plasma performance. Determining the characteristics of PFCs at the time of exposure to the plasma, however, is difficult because they can only be analyzed after venting the vacuum vessel and removing them at the end of an operational period. The Materials Analysis and Particle Probe (MAPP) addresses this problem by enabling PFC samples to be exposed to plasmas, and then withdrawn into an analysis chamber without breaking vacuum. The MAPP system was used to introduce samples that matched the metallic PFCs of the Lithium Tokamak Experiment (LTX). Lithium that was subsequently evaporated onto the walls also covered the MAPP samples, which were then subject to LTX discharges. In vacuo extraction and analysis of the samples indicated that lithium oxide formed on the PFCs, but improved plasma performance persisted in LTX. The reduced recycling this suggests is consistent with separate surface science experiments that demonstrated deuterium retention in the presence of lithium oxide films. Since oxygen decreases the thermal stability of the deuterium in the film, the release of deuterium was observed below the lithium deuteride dissociation temperature. This may explain what occurred when lithium was applied to the surface of the NSTX Liquid Lithium Divertor (LLD). The LLD had segments with individual heaters, and the deuterium-alpha emission was clearly lower in the cooler regions. The plan for NSTX-U is to replace the graphite tiles with high-Z PFCs, and apply lithium to their surfaces with lithium evaporation. Experiments with lithium coatings on such PFCs suggest that deuterium could still be retained if lithium compounds form, but limiting their surface temperatures may be necessary.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Read me and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Fusion Engineering and Design, 2016", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1016/j.fusengdes.2016.06.056", "language": "en_US" }, { "key": "dc.subject", "value": "lithium", "language": "en_US" }, { "key": "dc.subject", "value": "plasma-surface interactions", "language": "en_US" }, { "key": "dc.subject", "value": "materials science and technology", "language": "en_US" }, { "key": "dc.title", "value": "Hydrogen Retention in Lithium on Metallic Walls from \u201cIn Vacuo\u201d Analysis in LTX and Implications for High-Z Plasma-Facing Components in NSTX-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brentley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 84483, "name": "Quasi-static and dynamic magnetic tension forces in arched, line-tied magnetic flux ropes", "handle": "88435/dsp01j67316255", "type": "item", "link": "/rest/items/84483", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-10-27 01:11:20.935", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Myers, Clayton", "language": null }, { "key": "dc.contributor.author", "value": "Yamada, Masaaki", "language": null }, { "key": "dc.contributor.author", "value": "Ji, Hantao", "language": null }, { "key": "dc.contributor.author", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.author", "value": "Jara-Almonte, Jonathan", "language": null }, { "key": "dc.contributor.author", "value": "Fox, William", "language": null }, { "key": "dc.date.accessioned", "value": "2016-10-26T20:52:58Z", "language": null }, { "key": "dc.date.available", "value": "2016-10-26T20:52:58Z", "language": null }, { "key": "dc.date.issued", "value": "2016-12", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01j67316255", "language": null }, { "key": "dc.description.abstract", "value": "Solar eruptions are often driven by magnetohydrodynamic instabilities such as the torus and kink instabilities that act on line-tied magnetic flux ropes. Recent laboratory experiments designed to study these eruptive instabilities have demonstrated the key role of both dynamic (Myers et al 2015 Nature 528, 526) and quasi-static (Myers et al 2016 Phys. Plasmas, in press) magnetic tension forces in contributing to the equilibrium and stability of line-tied magnetic flux ropes. In this paper, we synthesize these laboratory results and explore the relationship between the dynamic and quasi-static tension forces. While the quasi-static tension force is found to contribute to the flux rope equilibrium in a number of regimes, the dynamic tension force is substantial mostly in the so-called failed torus regime where magnetic self-organization events prevent the flux rope from erupting.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Readme and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.subject", "value": "Laboratory Astrophysics", "language": "en_US" }, { "key": "dc.subject", "value": "Solar Eruptions", "language": "en_US" }, { "key": "dc.subject", "value": "Magnetohydrodynamic Equilibrium", "language": "en_US" }, { "key": "dc.subject", "value": "Magnetohydrodynamic Instabilities", "language": "en_US" }, { "key": "dc.title", "value": "Quasi-static and dynamic magnetic tension forces in arched, line-tied magnetic flux ropes", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brentley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "National Science Foundation/Department of Energy Center for Magnetic Self-Organization", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 83467, "name": "Remote-sensing gas measurements with coherent Rayleigh-Brillouin scattering", "handle": "88435/dsp01765373814", "type": "item", "link": "/rest/items/83467", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-09-07 06:10:55.524", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Gerakis, A.", "language": null }, { "key": "dc.contributor.author", "value": "Shneider, M. N.", "language": null }, { "key": "dc.contributor.author", "value": "Stratton, B. C.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-08-15T17:20:28Z", "language": null }, { "key": "dc.date.available", "value": "2016-08-15T17:20:28Z", "language": null }, { "key": "dc.date.issued", "value": "2016", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01765373814", "language": null }, { "key": "dc.description.abstract", "value": "We measure the coherent Rayleigh-Brillouin scattering (CRBS) signal integral as a function of the recorded gas pressure in He, Co2, SF6, and air, and we confirm the already established quadratic dependence of the signal on the gas density. We propose the use of CRBS as an effective diagnostic for the remote measurement of gas\u2019 density (pressure) and temperature, as well as polarizability, for gases of known composition.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Both files are TAB limited. \r\n\r\nFIG3.txt:\r\n\r\n-In the first column is the time as recorded on the oscilloscope. \r\n-The second column is the frequency/time conversion through the analysis of the chirped lattice that results in the CRBS spectrum. \r\n-The third column is the corresponding group phase velocity of the lattice, resulting from the frequency and the crossing angle of 178 degrees. \r\n-The fourth column is the CRBS signal for SF6 gas as recorded on the oscilloscope. \r\n-The fifth column is the normalized CRBS signal from the fourth column. \r\n\r\nRawData.txt:\r\n\r\n-These are the raw data recordings for the gases presented in FIG4. What is plotted in FIG4 is the average value per pressure per gas out of the three measurements. \r\n\r\nFIG4.txt:\r\n\r\n-First column is the pressure, which is the X axis of the plot of FIG4.\r\n-The next four columns (2,3,4,5) are respectively the Average Y, Average Y minus the Recorded background, Standard error and theoretical curve for SF6.\r\n-The next four columns (6,7,8,9) are respectively the Average Y, Average Y minus the Recorded background, Standard error and theoretical curve for air.\r\n-The next column (10) is the recorded signal for Helium minus the recorded background. \r\n-The next four columns (11,12,13,14) are respectively the Average Y, Average Y minus the Recorded background, Standard error and theoretical curve for CO2.\r\n-Also included in the repository are photos of the Origin file where these data were processed, showing the recorded BG values that were used.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Applied Physics Letters, vol. 109, page 031112 (2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4959778", "language": "en_US" }, { "key": "dc.subject", "value": "Polarizability", "language": "en_US" }, { "key": "dc.subject", "value": "Temperature measurement", "language": "en_US" }, { "key": "dc.subject", "value": "High pressure", "language": "en_US" }, { "key": "dc.subject", "value": "Scattering measurements", "language": "en_US" }, { "key": "dc.subject", "value": "Speed of sound", "language": "en_US" }, { "key": "dc.title", "value": "Remote-sensing gas measurements with coherent Rayleigh-Brillouin scattering", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brent", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 83407, "name": "Understanding the dynamics and energetics of magnetic reconnection in a laboratory plasma: Review of recent progress on selected fronts", "handle": "88435/dsp01vx021h566", "type": "item", "link": "/rest/items/83407", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2016-08-13 01:13:47.693", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Yamada, M.", "language": null }, { "key": "dc.contributor.author", "value": "Yoo, J.", "language": null }, { "key": "dc.contributor.author", "value": "Myers, C. E.", "language": null }, { "key": "dc.date.accessioned", "value": "2016-08-12T17:32:28Z", "language": null }, { "key": "dc.date.available", "value": "2016-08-12T17:32:28Z", "language": null }, { "key": "dc.date.issued", "value": "2016-05", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01vx021h566", "language": null }, { "key": "dc.description.abstract", "value": "Magnetic reconnection is a fundamental process at work in laboratory, space and astrophysical plasmas, in which magnetic field lines change their topology and convert magnetic energy to plasma particles by acceleration and heating. One of the most important problems in reconnection research has been to understand why reconnection occurs so much faster than predicted by MHD theory. Following the recent pedagogical review of this subject [M. Yamada, R. Kulsrud, and H. Ji, Rev. Mod. Phys. {\\bf 82}, 603 (2010)], this paper presents a review of more recent discoveries and findings in the research of fast magnetic reconnection in laboratory, space, and astrophysical plasmas. In spite of the huge difference in physical scales, we find remarkable commonality between the characteristics of the magnetic reconnection in laboratory and space plasmas. In this paper, we will focus especially on the energy flow, a key feature of the reconnection process. In particular the experimental results on the energy conversion and partitioning in a laboratory reconnection layer [M. Yamada {\\it et al.}, Nat. Commu. {\\bf 5}, 4474 (2014)] are discussed and compared with quantitative estimates based on two-fluid analysis. In the Magnetic Reconnection Experiment (MRX), we find that energy deposition to electrons is localized near the X-point and is mostly from the electric field component perpendicular to the magnetic field. The mechanisms of ion acceleration and heating are also identified and a systematic and quantitative study on the inventory of converted energy within a reconnection layer with a well-defined but variable boundary. The measured energy partition in a reconnection region of similar effective size ($L \\approx$ 3 ion skin depths) of the Earth's magneto-tail [J. Eastwood {\\it et al.}, Phys. Rev. Lett. {\\bf 110}, 225001 (2013)] is notably consistent with our laboratory results. Finally, to study the global aspects of magnetic reconnection, we have carried out a laboratory experiment on the stability criteria for solar flare eruptions, including {\\textquotedblleft}storage and release{\\textquotedblright} mechanisms of magnetic energy. We show that toroidal magnetic flux generated by magnetic relaxation (reconnection) processes generates a new stabilizing force which prevents plasma eruption. This result has lead us to discovery of a new stabilizing force for solar flares [C. E. Myers {\\it et al.}, Nature {\\bf 528}, 526 (2015)]", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Raedme and data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas, Vol. 23, p. 055402 (May 2016)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://dx.doi.org/10.1063/1.4948721", "language": "en_US" }, { "key": "dc.subject", "value": "Magnetic Reconnection", "language": "en_US" }, { "key": "dc.subject", "value": "Energy Conversion", "language": "en_US" }, { "key": "dc.subject", "value": "Solar Eruption", "language": "en_US" }, { "key": "dc.title", "value": "Understanding the dynamics and energetics of magnetic reconnection in a laboratory plasma: Review of recent progress on selected fronts", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brentley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 96756, "name": "Spontaneous multi-keV electron generation in a low-RF-power axisymmetric mirror machine", "handle": "88435/dsp019s161896q", "type": "item", "link": "/rest/items/96756", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-05-29 05:13:49.448", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Swanson, C.;Cohen, S.A.", "language": null }, { "key": "dc.date.accessioned", "value": "2019-05-28T14:32:59Z", "language": null }, { "key": "dc.date.available", "value": "2019-05-28T14:32:59Z", "language": null }, { "key": "dc.date.issued", "value": "2019-05", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp019s161896q", "language": null }, { "key": "dc.description.abstract", "value": "Title:\n\nSpontaneous multi-keV electron generation in a low-RF-power axisymmetric mirror machine\n\nAbstract:\n\nX-ray emission shows the existence of multi-keV electrons in low-temperature, low-power, capacitively-coupled RF-heated magnetic-mirror plasmas that also contain a warm (300 eV) minority electron population. Though these warm electrons are initially passing particles, we suggest that collisionless scattering -- mu non-conservation in the static vacuum field -- is responsible for a minority of them to persist in the mirror cell for thousands of transits during which time a fraction are energized to a characteristic temperature of 3 keV, with some electrons reaching energies above 30 keV. A heuristic model of the heating by a Fermi-acceleration-like mechanism is presented, with mu non-conservation in the static vacuum field as an essential feature.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": null, "language": "en_US" }, { "key": "dc.title", "value": "Spontaneous multi-keV electron generation in a low-RF-power axisymmetric mirror machine", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 90847, "name": "Calibrationless rotating Lorentz-force flowmeters for low flow rate applications", "handle": "88435/dsp011544br79n", "type": "item", "link": "/rest/items/90847", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-06-12 13:28:19.318", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Hvasta, M. G.", "language": null }, { "key": "dc.contributor.author", "value": "Dudt, D.", "language": null }, { "key": "dc.contributor.author", "value": "Fisher, A. E.", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, E.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-06-12T17:28:19Z", "language": null }, { "key": "dc.date.available", "value": "2018-06-12T17:28:19Z", "language": null }, { "key": "dc.date.issued", "value": "2018-05-29", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp011544br79n", "language": null }, { "key": "dc.description.abstract", "value": "A 'weighted magnetic bearing' has been developed to improve the performance of \r\nrotating Lorentz-force flowmeters (RLFFs). Experiments have shown that the new bearing \r\nreduces frictional losses within a double-sided, disc-style RLFF to negligible levels. \r\nOperating such an RLFF under 'frictionless' conditions provides two major benefits. \r\nFirst, the steady-state velocity of the RLFF magnets matches the average velocity of the \r\nflowing liquid at low flow rates. This enables an RLFF to make accurate volumetric flow \r\nmeasurements without any calibration or prior knowledge of the fluid properties. Second, \r\ndue to minimized frictional losses, an RLFF is able to measure low flow rates that cannot \r\nbe detected when conventional, high-friction bearings are used. This paper provides a \r\nbrief background on RLFFs, gives a detailed description of weighted magnetic bearings, \r\nand compares experimental RLFF data to measurements taken with a commercially available \r\nflowmeter.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Read me and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Measurement Science and Technology, 2018, vol. 29, p. 075303", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1361-6501/aac3b5", "language": "en_US" }, { "key": "dc.subject", "value": "low-friction bearings", "language": "en_US" }, { "key": "dc.subject", "value": "Lorentz-force velocimetry", "language": "en_US" }, { "key": "dc.subject", "value": "flowmeter", "language": "en_US" }, { "key": "dc.subject", "value": "liquid metal", "language": "en_US" }, { "key": "dc.title", "value": "Calibrationless rotating Lorentz-force flowmeters for low flow rate applications", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brent", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 90412, "name": "Detection of an electron beam in a high density plasma via an electrostatic probe", "handle": "88435/dsp01m900nx11d", "type": "item", "link": "/rest/items/90412", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-04-19 04:10:19.316", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Majeski, Stephen", "language": null }, { "key": "dc.contributor.author", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.author", "value": "Zweben, Stewart", "language": null }, { "key": "dc.contributor.author", "value": "Yamada, Masaaki", "language": null }, { "key": "dc.date.accessioned", "value": "2018-04-18T20:33:51Z", "language": null }, { "key": "dc.date.available", "value": "2018-04-18T20:33:51Z", "language": null }, { "key": "dc.date.issued", "value": "2018", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01m900nx11d", "language": null }, { "key": "dc.description.abstract", "value": "An electron beam is detected by a 1D floating potential probe array in a relatively high density (10e12 \u2212 10e13 cm\u22123) and low temperature (\u223c 5 eV) plasma of the Magnetic Reconnection Experiment (MRX). Clear perturbations in the floating potential profile by the electron beam are observed. Based on the floating potential profile and a current balance equation to the probe array tips, the effective width of the electron beam is determined, from which we determine the radial and toroidal beam current density profiles. After the profile of the electron beam is specified from the measured beam current, we demonstrate the consistency of the current balance equation and the location of the perturbation is also in agreement with field line mapping. No significant broadening of the electron beam is observed after the beam propagates for tens of centimeters through the high density plasma. These results prove that the field line mapping is, in principle, possible in high density plasmas.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Data files. pdf files for figures 1 and 2. cdf files for figures 3-7.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "DOI:10.1088/1361-6587/aabd0e", "language": "en_US" }, { "key": "dc.subject", "value": "Electron beam detection", "language": "en_US" }, { "key": "dc.subject", "value": "floating potential", "language": "en_US" }, { "key": "dc.subject", "value": "field line mapping", "language": "en_US" }, { "key": "dc.title", "value": "Detection of an electron beam in a high density plasma via an electrostatic probe", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brent", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 89667, "name": "Quantitative imaging of carbon dimer precursor for nanomaterial synthesis in the carbon arc", "handle": "88435/dsp01pc289m744", "type": "item", "link": "/rest/items/89667", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-02-09 04:06:49.97", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Vekselman, V.", "language": null }, { "key": "dc.contributor.author", "value": "Khrabry, A.", "language": null }, { "key": "dc.contributor.author", "value": "Kaganovich, I.", "language": null }, { "key": "dc.contributor.author", "value": "Stratton, B.", "language": null }, { "key": "dc.contributor.author", "value": "Selinsky, R. S.", "language": null }, { "key": "dc.contributor.author", "value": "Raitses, Y.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-02-08T15:26:56Z", "language": null }, { "key": "dc.date.available", "value": "2018-02-08T15:26:56Z", "language": null }, { "key": "dc.date.issued", "value": "2018-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01pc289m744", "language": null }, { "key": "dc.description.abstract", "value": "Delineating the dominant processes responsible for nanomaterial synthesis in a plasma\r\nenvironment requires measurements of the precursor species contributing to the growth of\r\nnanostructures. We performed comprehensive measurements of spatial and temporal profiles of\r\ncarbon dimers in sub-atmospheric-pressure carbon arc by laser-induced fluorescence.\r\nMeasured spatial profiles of carbon dimers coincide with the growth region of carbon nanotubes (Fang et al\r\n2016 Carbon 107 273-80) and vary depending on the arc operation mode, which is determined\r\nby the discharge current and the ablation rate of the graphite anode. The carbon dimer density profile\r\nexhibits large spatial and time variations due to motion of the arc core. A comparison of the\r\nexperimental data with the 2D simulation results of self-consistent arc modeling shows a good\r\nagreement. The model predicts well the main processes determining spatial profiles of carbon\r\ndimers.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Read me and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Sources Science and Technology, vol. 27, p. 02008, 2018", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1361-6595/aaa735", "language": "en_US" }, { "key": "dc.subject", "value": "arc nanomaterial synthesis", "language": "en_US" }, { "key": "dc.subject", "value": "laser induced fluorescence", "language": "en_US" }, { "key": "dc.subject", "value": "atmospheric plasma diagnostic", "language": "en_US" }, { "key": "dc.subject", "value": "arc discharge", "language": "en_US" }, { "key": "dc.title", "value": "Quantitative imaging of carbon dimer precursor for nanomaterial synthesis in the carbon arc", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brentley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 91753, "name": "Design and measurement methods for a lithium vapor box similarity experiment", "handle": "88435/dsp01bz60cz987", "type": "item", "link": "/rest/items/91753", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-08-04 04:08:35.395", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Schwartz, J. A.", "language": null }, { "key": "dc.contributor.author", "value": "Emdee, E. D.", "language": null }, { "key": "dc.contributor.author", "value": "Jaworski, M. A", "language": null }, { "key": "dc.contributor.author", "value": "Goldston, R. J.", "language": null }, { "key": "dc.date.accessioned", "value": "2018-08-03T14:38:09Z", "language": null }, { "key": "dc.date.available", "value": "2018-08-03T14:38:09Z", "language": null }, { "key": "dc.date.issued", "value": "2018-08", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01bz60cz987", "language": null }, { "key": "dc.description.abstract", "value": "The lithium vapor box divertor is a concept for handling the extreme divertor heat fluxes in magnetic fusion devices. In a baffled slot divertor, plasma interacts with a dense cloud of Li vapor which radiates and cools the plasma, leading to recombination and detachment. Before testing on a tokamak the concept should be validated: we plan to study detachment and heat redistribution by a Li vapor cloud in laboratory experiments.\r\nMass changes and temperatures are measured to validate a Direct Simulation Monte Carlo model of neutral Li.\r\nThe initial experiment involves a 5 cm diameter steel box containing 10g of Li held at 650 degrees C as vapor flows out a wide nozzle into a similarly-sized box at a lower temperature. Diagnosis is made challenging by the required material compatibility with lithium vapor. Vapor pressure is a steep function of temperature, so to validate mass flow models to within 10%, absolute temperature to within 4.5K is required. The apparatus is designed to be used with an analytical balance to determine mass transport. Details of the apparatus and methods of temperature and mass flow measurements are presented.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Readme and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments, vol. 89, 2018", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/1.5039406", "language": "en_US" }, { "key": "dc.subject", "value": "lithium", "language": "en_US" }, { "key": "dc.subject", "value": "thermocouples", "language": "en_US" }, { "key": "dc.subject", "value": "vapor", "language": "en_US" }, { "key": "dc.subject", "value": "detachment", "language": "en_US" }, { "key": "dc.subject", "value": "Li", "language": "en_US" }, { "key": "dc.subject", "value": "lithium vapor", "language": "en_US" }, { "key": "dc.title", "value": "Design and measurement methods for a lithium vapor box similarity experiment", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brent", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 85129, "name": "Application of IR imaging for free-surface velocity measurement in liquid-metal systems", "handle": "88435/dsp015x21th90m", "type": "item", "link": "/rest/items/85129", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-01-25 01:09:54.361", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Hvasta, M. G.", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, E.", "language": null }, { "key": "dc.contributor.author", "value": "Fisher, A.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-01-24T18:55:45Z", "language": null }, { "key": "dc.date.available", "value": "2017-01-24T18:55:45Z", "language": null }, { "key": "dc.date.issued", "value": "2017-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp015x21th90m", "language": null }, { "key": "dc.description.abstract", "value": "Measuring free-surface, liquid-metal flow velocity is challenging to do in a reliable and accurate manner. This paper presents a non-invasive, easily-calibrated method of measuring the surface velocities of open-channel liquid-metal flows using an IR camera. Unlike other spatially-limited methods, this IR camera particle tracking technique provides full field-of-view data that can be used to better understand open-channel flows and determine surface boundary conditions. This method could be implemented and automated for a wide range of liquid-metal experiments, even if they operate at high-temperatures or within strong magnetic fields.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Read me and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments 88, 013501 (2017)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "http://doi.org/10.1063/1.4973421", "language": "en_US" }, { "key": "dc.subject", "value": "liquid-metal", "language": "en_US" }, { "key": "dc.subject", "value": "free-surface", "language": "en_US" }, { "key": "dc.subject", "value": "IR camera", "language": "en_US" }, { "key": "dc.subject", "value": "velocimetry", "language": "en_US" }, { "key": "dc.title", "value": "Application of IR imaging for free-surface velocity measurement in liquid-metal systems", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brentley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 88129, "name": "Experimental calibration procedures for rotating Lorentz-force flowmeters", "handle": "88435/dsp01m039k7543", "type": "item", "link": "/rest/items/88129", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2017-07-27 13:04:23.974", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Hvasta, M. G.", "language": null }, { "key": "dc.contributor.author", "value": "Slighton, N. T.", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, E.", "language": null }, { "key": "dc.contributor.author", "value": "Fisher, A. E.", "language": null }, { "key": "dc.date.accessioned", "value": "2017-07-27T17:04:23Z", "language": null }, { "key": "dc.date.available", "value": "2017-07-27T17:04:23Z", "language": null }, { "key": "dc.date.issued", "value": "2017", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01m039k7543", "language": null }, { "key": "dc.description.abstract", "value": "Rotating Lorentz-force flowmeters are a novel and useful technology with a range of\r\napplications in a variety of different industries. However, calibrating these flowmeters can\r\nbe challenging, time-consuming, and expensive. In this paper, simple calibration procedures\r\nfor rotating Lorentz-force flowmeters are presented. These procedures eliminate the need for\r\nexpensive equipment, numerical modeling, redundant flowmeters, and system down-time.\r\nThe calibration processes are explained in a step-by-step manner and compared to experimental results.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Read me and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Measurement Science and Technology, 2017, vol. 28, page 085901 (10 pp)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1361-6501/aa781b", "language": "en_US" }, { "key": "dc.subject", "value": "liquid metals", "language": "en_US" }, { "key": "dc.subject", "value": "flowmeter", "language": "en_US" }, { "key": "dc.subject", "value": "calibration", "language": "en_US" }, { "key": "dc.subject", "value": "rotating", "language": "en_US" }, { "key": "dc.subject", "value": "Lorentz force", "language": "en_US" }, { "key": "dc.title", "value": "Experimental calibration procedures for rotating Lorentz-force flowmeters", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brentley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 92713, "name": "Experimental demonstration of hydraulic jump control in liquid metal channel flow using Lorentz force", "handle": "88435/dsp01b2773z44j", "type": "item", "link": "/rest/items/92713", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2018-08-22 04:11:21.259", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Fisher, Adam", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, Egemen", "language": null }, { "key": "dc.contributor.author", "value": "Hvasta, Mike", "language": null }, { "key": "dc.date.accessioned", "value": "2018-08-21T18:04:07Z", "language": null }, { "key": "dc.date.available", "value": "2018-08-21T18:04:07Z", "language": null }, { "key": "dc.date.issued", "value": "2018", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01b2773z44j", "language": null }, { "key": "dc.description.abstract", "value": "In this paper, hydraulic jump control using electromagnetic force in a liquid metal flow is presented. The control methods used give insight into the hydraulic jump behavior in the presence of magnetic fields and electrical currents. Flowing liquid metals is a proposed solution to heat flux challenges posed in fusion reactors, specifically the tokamak. Unfortunately, thin, fast-flowing liquid metal divertor concepts for fusion reactors are susceptible to hydraulic jumps that drastically reduce the liquid metal flow speed, leading to potential problems such as excessive evaporation, unsteady power removal, and possible plasma disruption. Highly electrically conductive flows within the magnetic fields do not exhibit traditional hydraulic jump behavior. There is very little research investigating the use of externally injected electrical currents and magnetic fields to control liquid metal hydraulic jumps. By using externally injected electrical currents and a magnetic field, a Lorentz force (also referred to as j \u00d7 B force) may be generated to control the liquid metal jump behavior. In this work, a free-surface liquid metal\u2014GaInSn eutectic or \u201cgalinstan\u201d\u2014flow through an electrically insulating rectangular duct was investigated. It was shown that applying a Lorentz force has a repeatable and predictable impact on the hydraulic jump, which can be used for liquid metal control within next-generation fusion reactors.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Readme and data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Fluids vol. 30, page 067104 (2018)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/1.5026993", "language": "en_US" }, { "key": "dc.subject", "value": "liquid metal", "language": "en_US" }, { "key": "dc.subject", "value": "hydraulic jump", "language": "en_US" }, { "key": "dc.subject", "value": "Lorentz force", "language": "en_US" }, { "key": "dc.subject", "value": "MHD", "language": "en_US" }, { "key": "dc.title", "value": "Experimental demonstration of hydraulic jump control in liquid metal channel flow using Lorentz force", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brentley", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 108609, "name": "Statistical properties of magnetic structures and energy dissipation during turbulent reconnection in the Earth's magnetotail", "handle": "88435/dsp01cf95jf52h", "type": "item", "link": "/rest/items/108609", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-10-21 15:31:35.331", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Bergstedt, K.", "language": null }, { "key": "dc.contributor.author", "value": "Ji, H.", "language": null }, { "key": "dc.contributor.author", "value": "Jara-Almonte, J.", "language": null }, { "key": "dc.contributor.author", "value": "Yoo, J.", "language": null }, { "key": "dc.contributor.author", "value": "Ergun, R. E.", "language": null }, { "key": "dc.contributor.author", "value": "Chen, L.-J.", "language": null }, { "key": "dc.date.accessioned", "value": "2020-10-21T19:31:34Z", "language": null }, { "key": "dc.date.available", "value": "2020-10-21T19:31:34Z", "language": null }, { "key": "dc.date.issued", "value": "2020-09-14", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01cf95jf52h", "language": null }, { "key": "dc.description.abstract", "value": "We present the first statistical study of magnetic structures and associated energy dissipation observed during a single period of turbulent magnetic reconnection, by using the in situ measurements of the Magnetospheric Multiscale mission in the Earth's magnetotail on 26 July 2017. The structures are selected by identifying a bipolar signature in the magnetic field and categorized as plasmoids or current sheets via an automated algorithm which examines current density and plasma flow. The size of the plasmoids forms a decaying exponential distribution ranging from subelectron up to ion scales. The presence of substantial number of current sheets is consistent with a physical picture of dynamic production and merging of plasmoids during turbulent reconnection. The magnetic structures are locations of significant energy dissipation via electric field parallel to the local magnetic field, while dissipation via perpendicular electric field dominates outside of the structures. Significant energy also returns from particles to fields.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Analysis scripts.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Geophysical Research Letters, 47, e2020GL088540", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1029/2020GL088540", "language": "en_US" }, { "key": "dc.subject", "value": "Magnetotail", "language": "en_US" }, { "key": "dc.subject", "value": "plasmoids", "language": "en_US" }, { "key": "dc.subject", "value": "reconnection", "language": "en_US" }, { "key": "dc.subject", "value": "turbulence", "language": "en_US" }, { "key": "dc.title", "value": "Statistical properties of magnetic structures and energy dissipation during turbulent reconnection in the Earth's magnetotail", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, B.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "NASA Grant No. NNH15AB29I", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "National Science Foundation Graduate Research Fellowship under Grant No. DGE-2039656", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 108956, "name": "Developments on two lithium vapor-box linear test-stand experiments", "handle": "88435/dsp019306t236q", "type": "item", "link": "/rest/items/108956", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-02-19 15:52:47.524", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Schwartz, Jacob A.", "language": "" }, { "key": "dc.contributor.author", "value": "Goldston, Robert J.", "language": "" }, { "key": "dc.date.accessioned", "value": "2021-02-19T20:52:45Z", "language": null }, { "key": "dc.date.available", "value": "2021-02-19T20:52:45Z", "language": null }, { "key": "dc.date.issued", "value": "2021-01", "language": "" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp019306t236q", "language": null }, { "key": "dc.description.abstract", "value": "The lithium vapor-box divertor is a possible fusion power exhaust solution.It uses condensation pumping to create a gradient of vapor density in a divertor slot; this should allow a stable detachment front without active feedback.As initial explorations of the concept, two test stands which take the form of three connected cylindrical stainless steel boxes are being developed: one without plasma at PPPL, to test models of lithium evaporation and flow; and one for the linear plasma device Magnum-PSI (at DIFFER in Eindhoven, The Netherlands) to test the ability of a lithium vapor cloud to induce volumetric detachment and redistribute the plasma power.The first experiment uses boxes with diameters of 6 cm, joined by apertures with diameters of 2.2 cm. Up to 1 g of Li is placed in one box, which is heated to up to 600 degrees C. The Li evaporates, then flows to and condenses in the two other, cooler boxes over several minutes. The quantity of Li transported is assessed by weighing the boxes before and after the heating cycle, and is compared to the quantity predicted to flow for the box at its measured temperature using a Direct Simulation Monte Carlo code, SPARTA. With good experimental conditions, the two values agree to within 15%.The experiment on Magnum-PSI is in the conceptual design stage.The design is assessed by simulations using the code B2.5-Eunomia.They show that when the hydrogen-ion plasma beam, with n_e = 4e20 per cubic meter, T_e = 1.5 eV, and r = 1 cm, is passed through a 16 cm long, 12 Pa, 625 degree C Li vapor cloud, the plasma heat flux and pressure on the target are significantly reduced compared to the case without Li.With the Li present, the plasma is cooled by excitation of Li neutrals followed by radiation until it volumetrically recombines, lowering the heat flux from 3.7 MW/m^2 to 0.13 MW/m^2, and the pressure is reduced by 93%, largely by collisions of hydrogen ions with neutral Li.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Materials and Energy", "language": "en_US" }, { "key": "dc.subject", "value": "vapor box", "language": "en_US" }, { "key": "dc.subject", "value": "lithium vapor-box", "language": "en_US" }, { "key": "dc.subject", "value": "vapor-box", "language": "en_US" }, { "key": "dc.subject", "value": "divertor", "language": "en_US" }, { "key": "dc.subject", "value": "lithium", "language": "en_US" }, { "key": "dc.subject", "value": "test-stand", "language": "en_US" }, { "key": "dc.subject", "value": "vapor", "language": "en_US" }, { "key": "dc.subject", "value": "Magnum-PSI;", "language": "en_US" }, { "key": "dc.title", "value": "Developments on two lithium vapor-box linear test-stand experiments", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 110275, "name": "Multi-Fluid and Kinetic Models of Partially Ionized Magnetic Reconnection", "handle": "88435/dsp01sj1395028", "type": "item", "link": "/rest/items/110275", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-03-29 09:56:03.41", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Jara-Almonte, J.", "language": null }, { "key": "dc.contributor.author", "value": "Murphy, N.A.", "language": null }, { "key": "dc.contributor.author", "value": "Ji, H.", "language": null }, { "key": "dc.date.accessioned", "value": "2021-03-29T13:56:02Z", "language": null }, { "key": "dc.date.available", "value": "2021-03-29T13:56:02Z", "language": null }, { "key": "dc.date.issued", "value": "2021", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01sj1395028", "language": null }, { "key": "dc.description.abstract", "value": "Magnetic reconnection in partially ionized plasmas is a ubiquitous and important phenomena in both laboratory and astrophysical systems. Here, simulations of partially ionized magnetic reconnection with well-matched initial conditions are performed using both multi-fluid and fully-kinetic approaches. Despite similar initial conditions, the time-dependent evolution differs between the two models. In multi-fluid models, the reconnection rate locally obeys either a decoupled Sweet-Parker scaling, where neutrals are unimportant, or a fully coupled Sweet-Parker scaling, where neutrals and ions are strongly coupled, depending on the resistivity. In contrast, kinetic models show a faster reconnection rate that is proportional to the fully-coupled, bulk Alfv\\'en speed, $v_A^\\star$. These differences are interpreted as the result of operating in different collisional regimes. Multi-fluid simulations are found to maintain $\\nu_{ni}L/v_A^\\star \\gtrsim 1$, where $\\nu_{ni}$ is the neutral-ion collision frequency and $L$ is the time-dependent current sheet half-length. This strongly couples neutrals to the reconnection outflow, while kinetic simulations evolve to allow $\\nu_{ni}L/v_A^\\star < 1$, decoupling neutrals from the reconnection outflow. Differences in the way reconnection is triggered may explain these discrepancies.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.subject", "value": "Magnetic reconnection", "language": "en_US" }, { "key": "dc.subject", "value": "Partially ionized plasmas", "language": "en_US" }, { "key": "dc.title", "value": "Multi-Fluid and Kinetic Models of Partially Ionized Magnetic Reconnection", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Stratton, Brent", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 118131, "name": "A thermodynamic phase transition in magnetic reconnection", "handle": "88435/dsp018k71nm17d", "type": "item", "link": "/rest/items/118131", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-07-09 14:05:21.056", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Jara-Almonte, Jonathan", "language": null }, { "key": "dc.contributor.author", "value": "Jara-Almonte, Jonathan", "language": null }, { "key": "dc.contributor.author", "value": "Hantao, Ji", "language": null }, { "key": "dc.date.accessioned", "value": "2021-07-09T18:05:20Z", "language": null }, { "key": "dc.date.available", "value": "2021-07-09T18:05:20Z", "language": null }, { "key": "dc.date.issued", "value": "2021-07-07", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp018k71nm17d", "language": null }, { "key": "dc.description.abstract", "value": "Data supporting the manuscript \"A thermodynamic phase transition in magnetic reconnection\" published in Physical Review Letters.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "See README.txt for details.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physical Review Letters, 2021", "language": "en_US" }, { "key": "dc.title", "value": "A thermodynamic phase transition in magnetic reconnection", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Jara-Almonte, Jonathan", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 122120, "name": "Lower Hybrid Drift Waves During Guide Field Reconnection", "handle": "88435/dsp0112579w37b", "type": "item", "link": "/rest/items/122120", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-09-20 18:00:17.129", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.author", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.author", "value": "Jeong-Young, Ji", "language": null }, { "key": "dc.contributor.author", "value": "M. V., Ambat", "language": null }, { "key": "dc.contributor.author", "value": "Shan, Wang", "language": null }, { "key": "dc.contributor.author", "value": "Hantao, Ji", "language": null }, { "key": "dc.contributor.author", "value": "Jenson, Lo", "language": null }, { "key": "dc.contributor.author", "value": "Bowen, Li", "language": null }, { "key": "dc.contributor.author", "value": "Yang, Ren", "language": null }, { "key": "dc.contributor.author", "value": "J., Jara-Almonte", "language": null }, { "key": "dc.contributor.author", "value": "William, Fox", "language": null }, { "key": "dc.contributor.author", "value": "Masaaki, Yamada", "language": null }, { "key": "dc.contributor.author", "value": "Andrew, Alt", "language": null }, { "key": "dc.contributor.author", "value": "Aaron, Goodman", "language": null }, { "key": "dc.date.accessioned", "value": "2021-08-18T18:28:07Z", "language": null }, { "key": "dc.date.available", "value": "2021-08-18T18:28:07Z", "language": null }, { "key": "dc.date.issued", "value": "2020-10-29", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp0112579w37b", "language": null }, { "key": "dc.description.abstract", "value": "Digital data for figures used in Lower Hybrid Drift Waves During Guide\r\nField Reconnection, Geophysical Research Letters, 47, e2020GL087192, 2020.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Geophysical Research Letters, 47, e2020GL087192, 2020", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1029/2020GL087192", "language": "en_US" }, { "key": "dc.title", "value": "Lower Hybrid Drift Waves During Guide Field Reconnection", "language": "en_US" }, { "key": "dc.title.alternative", "value": "Digital dataset for a paper \"Lower Hybrid Drift Waves During Guide Field Reconnection\"", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "NASA NNH14AX63I and NNH15AB29I", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "NSF AGS-1552142, AGS-1619584,", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "DOE grants DESC0016278 and DE-FG02-04ER54746", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "NSF-DOE partnership in plasma science grant DE-FG02-00ER54585", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 122140, "name": "Probe measurements of electric field and electron density fluctuations at megahertz frequencies using in-shaft miniature circuits", "handle": "88435/dsp01w9505358d", "type": "item", "link": "/rest/items/122140", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-31 14:27:13.593", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.author", "value": "Yibo, Hu", "language": null }, { "key": "dc.contributor.author", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.author", "value": "Ji, Hantao", "language": null }, { "key": "dc.contributor.author", "value": "Goodman, Aaron", "language": null }, { "key": "dc.contributor.author", "value": "Wu, Xuemei", "language": null }, { "key": "dc.date.accessioned", "value": "2021-08-18T21:23:55Z", "language": null }, { "key": "dc.date.available", "value": "2021-08-18T21:23:55Z", "language": null }, { "key": "dc.date.issued", "value": "2021-03-16", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01w9505358d", "language": null }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0035135", "language": null }, { "key": "dc.title", "value": "Probe measurements of electric field and electron density fluctuations at megahertz frequencies using in-shaft miniature circuits", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "National Natural Science Foundation of China (NNSFC) (Contract No. 11975163),", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "the Program for Graduates Research and Innovation in University of Jiangsu Province (Contract No. KYCX17-2025)", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 122198, "name": "Effects of Coulomb collisions on lower hybrid drift waves inside a laboratory reconnection current sheet", "handle": "88435/dsp01b2773z812", "type": "item", "link": "/rest/items/122198", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-31 14:26:07.399", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.author", "value": "Hu, Yibo", "language": null }, { "key": "dc.contributor.author", "value": "Ji, Jeong-Young", "language": null }, { "key": "dc.contributor.author", "value": "Ji, Hantao", "language": null }, { "key": "dc.contributor.author", "value": "Yamada, Masaaki", "language": null }, { "key": "dc.contributor.author", "value": "Goodman, Aaron", "language": null }, { "key": "dc.contributor.author", "value": "Bergstedt, Kendra", "language": null }, { "key": "dc.contributor.author", "value": "Alt, Andrew", "language": null }, { "key": "dc.date.accessioned", "value": "2021-08-20T00:38:20Z", "language": null }, { "key": "dc.date.available", "value": "2021-08-20T00:38:20Z", "language": null }, { "key": "dc.date.issued", "value": "2021", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01b2773z812", "language": null }, { "key": "dc.description.tableofcontents", "value": "Refer to readme.pdf for details of the dataset.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0052555", "language": null }, { "key": "dc.title", "value": "Effects of Coulomb collisions on lower hybrid drift waves inside a laboratory reconnection current sheet", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "NASA grant NNH20ZDA001N", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "NNSFC contract No. 11975163", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "DOE grant DE-FG02-04ER54746.", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 131221, "name": "Coupling between Alfven wave and Kelvin-Helmholtz waves in the low latitude boundary layer", "handle": "88435/dsp013r074z09k", "type": "item", "link": "/rest/items/131221", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 10:54:30.314", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Kim, Eun-Hwa", "language": null }, { "key": "dc.contributor.author", "value": "Johnson, Jay", "language": null }, { "key": "dc.contributor.author", "value": "Nykyri, Katariina", "language": null }, { "key": "dc.date.accessioned", "value": "2021-12-15T03:34:41Z", "language": null }, { "key": "dc.date.available", "value": "2021-12-15T03:34:41Z", "language": null }, { "key": "dc.date.issued", "value": "2021-12", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp013r074z09k", "language": null }, { "key": "dc.description.abstract", "value": "The Kelvin-Helmholtz (KH) instability of magnetohydrodynamic surface waves at the low latitude boundary layer is examined using both an eigenfrequency analysis and a time-dependent wave simulation. The analysis includes the effects of sheared flow and Alfven velocity gradient. When the magnetosheath flows are perpendicular to the ambient magnetic field direction, unstable KH waves that propagate obliquely to the sheared flow direction occur at the sheared flow surface when the Alfv\\'en Mach number is higher than an instability threshold. Including a shear transition layer between the magnetosphere and magnetosheath leads to secondary KH waves (driven by the sheared flow) that are coupled to the resonant surface Alfven wave. There are remarkable differences between the primary and the secondary KH waves including wave frequency, the growth rate, and the ratio between transverse and the compressional component. The secondary KH wave energy is concentrated near the shear Alfven wave frequency at the magnetosheath with a lower frequency than the primary KH waves. Although the growth rate of the secondary KH waves is lower than the primary KH waves, the threshold condition is lower, so it is expected that these types of waves will dominate at lower Mach number. Because the transverse component of the secondary KH waves is stronger than the primary KH waves, more efficient wave energy transfer from the boundary layer to the inner magnetosphere is also predicted.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Frontiers in Astronom and Space Sciences, 2021", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.3389/fspas.2021.785413", "language": "en_US" }, { "key": "dc.subject", "value": "Kelvin-Helmholtz instability", "language": "en_US" }, { "key": "dc.subject", "value": "Alfven wave", "language": "en_US" }, { "key": "dc.subject", "value": "Magnetopause", "language": "en_US" }, { "key": "dc.subject", "value": "Mode conversion", "language": "en_US" }, { "key": "dc.subject", "value": "boundary layer", "language": "en_US" }, { "key": "dc.subject", "value": "wave coupling", "language": "en_US" }, { "key": "dc.title", "value": "Coupling between Alfven wave and Kelvin-Helmholtz waves in the low latitude boundary layer", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kim, Eun-Hwa", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 139601, "name": "To dee or not to dee: costs and benefits of altering the triangularity of a steady-state DEMO-like reactor", "handle": "88435/dsp01rf55zb85t", "type": "item", "link": "/rest/items/139601", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-04-08 06:00:16.257", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Schwartz, Jacob A.", "language": null }, { "key": "dc.contributor.author", "value": "Nelson, A. O.", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, Egemen", "language": null }, { "key": "dc.date.accessioned", "value": "2022-04-08T00:47:57Z", "language": null }, { "key": "dc.date.available", "value": "2022-04-08T00:47:57Z", "language": null }, { "key": "dc.date.issued", "value": "2022-04", "language": null }, { "key": "dc.identifier.citation", "value": "J. A. Schwartz, A. O. Nelson, E. Kolemen, 2022, Data related to the paper \"To dee or not to dee: costs and benefits of altering the triangularity of a steady-state DEMO-like reactor\", Princeton Plasma Physics Laboratory, Princeton University DataSpace, ARK #####", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01rf55zb85t", "language": null }, { "key": "dc.description.abstract", "value": "Shaping a tokamak plasma to have a negative triangularity may allow operation in an ELM-free L-mode regime and with a larger strike-point radius, ameliorating divertor power-handling requirements. However, the shaping has a potential drawback in the form of a lower no-wall ideal beta limit, found using the MHD codes CHEASE and DCON. Using the new fusion systems code FAROES, we construct a steady-state DEMO2 reactor model. This model is essentially zero-dimensional and neglects variations in physical mechanisms like turbulence, confinement, and radiative power limits, which could have a substantial impact on the conclusions deduced herein. Keeping its shape otherwise constant, we alter the triangularity and compute the effects on the levelized cost of energy (LCOE). If the tokamak is limited to a fixed B field, then unless other means to increase performance (such as reduced turbulence, improved current drive efficiency or higher density operation) can be leveraged, a negative-triangularity reactor is strongly disfavored in the model due to lower \\beta_N limits at negative triangularity, which leads to tripling of the LCOE. However, if the reactor is constrained by divertor heat fluxes and not by magnet engineering, then a negative-triangularity reactor with higher B0 could be favorable: we find a class of solutions at negative triangularity with lower peak heat flux and lower LCOE than those of the equivalent positive triangularity reactors.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Contains figures and data presented directly in the figures for this paper. Also contains scripts (tokamak model and solver instructions) which was used to generate data for one of the figures. Please consult README.txt for detailed dataset contents.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion, 2022, in press", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/ac62f6", "language": "en_US" }, { "key": "dc.subject", "value": "tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "plasma", "language": "en_US" }, { "key": "dc.subject", "value": "FAROES", "language": "en_US" }, { "key": "dc.subject", "value": "systems code", "language": "en_US" }, { "key": "dc.subject", "value": "CHEASE", "language": "en_US" }, { "key": "dc.subject", "value": "DCON", "language": "en_US" }, { "key": "dc.subject", "value": "cost of electricity", "language": "en_US" }, { "key": "dc.subject", "value": "fusion reactor economics", "language": "en_US" }, { "key": "dc.title", "value": "To dee or not to dee: costs and benefits of altering the triangularity of a steady-state DEMO-like reactor", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Schwartz, Jacob A.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 139829, "name": "Interpreting ion-energy distributions using charge exchange emitted from deeply kinetic field-reversed-configuration plasmas", "handle": "88435/dsp01pk02cd897", "type": "item", "link": "/rest/items/139829", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 10:59:30.63", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Cohen, Samuel", "language": null }, { "key": "dc.contributor.author", "value": "Glasser, Alan", "language": null }, { "key": "dc.contributor.author", "value": "Cohen, Samuel", "language": null }, { "key": "dc.date.accessioned", "value": "2022-04-15T17:00:35Z", "language": null }, { "key": "dc.date.available", "value": "2022-04-15T17:00:35Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01pk02cd897", "language": null }, { "key": "dc.description.tableofcontents", "value": "Figures from paper", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0089430", "language": "en_US" }, { "key": "dc.title", "value": "Interpreting ion-energy distributions using charge exchange emitted from deeply kinetic field-reversed-configuration plasmas", "language": "en_US" }, { "key": "dc.title.alternative", "value": "Synthetic diagnostic for CX emission from FRCs", "language": "en_US" }, { "key": "dc.type", "value": "Image", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Cohen, Samuel", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 144183, "name": "Study of Stark Broadening of Krypton Helium-beta Lines and Estimation of Electron Density and Temperature in NIF Compressed Capsules", "handle": "88435/dsp01xk81jp54s", "type": "item", "link": "/rest/items/144183", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 11:20:52.675", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Hill, K. W.", "language": null }, { "key": "dc.contributor.author", "value": "Gao, L.", "language": null }, { "key": "dc.contributor.author", "value": "Kraus, B. F.", "language": null }, { "key": "dc.contributor.author", "value": "Bitter, M.", "language": null }, { "key": "dc.contributor.author", "value": "Efthimion, P. C.", "language": null }, { "key": "dc.contributor.author", "value": "Pablant, N. A.", "language": null }, { "key": "dc.contributor.author", "value": "Schneider, M. B.", "language": null }, { "key": "dc.contributor.author", "value": "Thorn, D. B.", "language": null }, { "key": "dc.contributor.author", "value": "Chen, H.", "language": null }, { "key": "dc.contributor.author", "value": "Kauffman, R. L.", "language": null }, { "key": "dc.contributor.author", "value": "Liedahl, D. A.", "language": null }, { "key": "dc.contributor.author", "value": "MacDonald, M. J.", "language": null }, { "key": "dc.contributor.author", "value": "MacPhee, A. G.", "language": null }, { "key": "dc.contributor.author", "value": "Scott, H. A.", "language": null }, { "key": "dc.contributor.author", "value": "Stoupin, S.", "language": null }, { "key": "dc.contributor.author", "value": "Doron, R.", "language": null }, { "key": "dc.contributor.author", "value": "Stambulchik, E.", "language": null }, { "key": "dc.contributor.author", "value": "Maron, Y.", "language": null }, { "key": "dc.contributor.author", "value": "Lahmann, B.", "language": null }, { "key": "dc.date.accessioned", "value": "2022-06-06T17:12:22Z", "language": null }, { "key": "dc.date.available", "value": "2022-06-06T17:12:22Z", "language": null }, { "key": "dc.date.issued", "value": "2022-06-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01xk81jp54s", "language": null }, { "key": "dc.description.abstract", "value": "Numerical data used to draw the figures in the manuscript", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Figs. 1-11.zip", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Physics and Controlled Fusion (2022)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1361-6587/ac9017", "language": "en_US" }, { "key": "dc.source", "value": "Simulations from code SimU of co-author E. Stambulchik", "language": "en_US" }, { "key": "dc.source", "value": "Data from National Ignition Facility (NIF) dHiRes spectrometer from 4 ICF shots", "language": "en_US" }, { "key": "dc.subject", "value": "NIF diagnostics x-ray spectroscopy", "language": "en_US" }, { "key": "dc.title", "value": "Study of Stark Broadening of Krypton Helium-beta Lines and Estimation of Electron Density and Temperature in NIF Compressed Capsules", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Hill, K. W.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 145895, "name": "Plasma Facing Components with Capillary Porous System and Liquid Metal Coolant Flow", "handle": "88435/dsp019w032619d", "type": "item", "link": "/rest/items/145895", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 11:08:22.977", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Khodak, Andrei", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, Rajesh", "language": null }, { "key": "dc.date.accessioned", "value": "2022-06-27T20:26:17Z", "language": null }, { "key": "dc.date.available", "value": "2022-06-27T20:26:17Z", "language": null }, { "key": "dc.date.issued", "value": "2021", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp019w032619d", "language": null }, { "key": "dc.description.abstract", "value": "Liquid metal can create a renewable protective surface on plasma facing components (PFC), with an additional advantage of deuterium pumping and the prospect of tritium extraction if liquid lithium (LL) is used and maintained below 450 C, the temperature above which LL vapor pressure begins to contaminate the plasma. LM can also be utilized as an efficient coolant, driven by the Lorentz force created with the help of the magnetic field in fusion devices. Capillary porous systems can serve as a conduit of LM and simultaneously provide stabilization of the LM flow, protecting against spills into the plasma. Recently a combination of a fast-flowing LM cooling system with a porous plasma facing wall (CPSF) was investigated [Khodak and Maingi (2021)]. The system takes an advantage of a magnetohydrodynamics velocity profile, as well as attractive LM properties to promote efficient heat transfer from the plasma to the LL at low pumping energy cost, relative to the incident heat flux on the PFC. In case of a disruption leading to excessive heat flux from the plasma to the LM PFCs, LL evaporation can stabilize the PFC surface temperature, due to high evaporation heat and apparent vapor shielding. The proposed CPSF was optimized analytically for the conditions of a Fusion Nuclear Science Facility [Kessel et al. (2019)]: 10T toroidal field and 10 MW/m2 peak incident heat flux. Computational fluid dynamics analysis confirmed that a CPSF system with 2.5 mm square channels can pump enough LL so that no additional coolant is needed.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Table of Contents is in a Readme file", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas, 2022", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0088015", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma Facing Components; Numerical Analysis; High Heat Flux", "language": "en_US" }, { "key": "dc.title", "value": "Plasma Facing Components with Capillary Porous System and Liquid Metal Coolant Flow", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.type", "value": "Image", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Khodak, Andrei", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 146170, "name": "Electron heating in 2-D: combining Fermi-Ulam acceleration and magnetic-moment non-adiabaticity in a mirror-configuration plasma", "handle": "88435/dsp01xp68kk38z", "type": "item", "link": "/rest/items/146170", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 11:15:14.998", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Swanson, Charles", "language": null }, { "key": "dc.contributor.author", "value": "Swanson, Charles", "language": null }, { "key": "dc.contributor.author", "value": "Galea, Christopher", "language": null }, { "key": "dc.date.accessioned", "value": "2022-07-01T14:55:40Z", "language": null }, { "key": "dc.date.available", "value": "2022-07-01T14:55:40Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.citation", "value": "C.P.S. Swanson, C. A. Galea, and S. A. Cohen, 2022, Electron heating in 2-D: combining Fermi-Ulam acceleration and magnetic-moment non-adiabaticity in a mirror-configuration plasma, Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01xp68kk38z", "language": null }, { "key": "dc.description.abstract", "value": "This dataset contains the files (scripts and data) required to produce the figures of the above reference.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Please see Readme.txt for the table of contents.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "C.P.S. Swanson, C. A. Galea, and S. A. Cohen, \"Electron heating in 2-D: combining Fermi-Ulam acceleration and magnetic-moment non-adiabaticity in a mirror-configuration plasma\", submitted to Physics of Plasmas, 2022", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0097299", "language": "en_US" }, { "key": "dc.title", "value": "Electron heating in 2-D: combining Fermi-Ulam acceleration and magnetic-moment non-adiabaticity in a mirror-configuration plasma", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Swanson, Charles", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 146393, "name": "Identification of a non-axisymmetric mode in laboratory experiments searching for standard magnetorotational instability", "handle": "88435/dsp01sx61dq46q", "type": "item", "link": "/rest/items/146393", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 11:06:29.05", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Wang, Yin", "language": null }, { "key": "dc.contributor.author", "value": "Gilson, Erik P.", "language": null }, { "key": "dc.contributor.author", "value": "Ebrahimi, Fatima", "language": null }, { "key": "dc.contributor.author", "value": "Goodman, Jeremy", "language": null }, { "key": "dc.contributor.author", "value": "Caspary, Kyle J.", "language": null }, { "key": "dc.contributor.author", "value": "Winarto, Himawan W.", "language": null }, { "key": "dc.contributor.author", "value": "Ji, Hantao", "language": null }, { "key": "dc.date.accessioned", "value": "2022-07-05T14:06:18Z", "language": null }, { "key": "dc.date.available", "value": "2022-07-05T14:06:18Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01sx61dq46q", "language": null }, { "key": "dc.description.abstract", "value": "This dataset provides the source data of figures in the main text of the paper \"Identification of a non-axisymmetric mode in laboratory experiments searching for standard magnetorotational instability\" accepted by Nature Communications.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "File name: \"SourceData.xlsx\" Description: source data for the 8 figures in the main text of the paper \"Identification of a non-axisymmetric mode in laboratory experiments searching for standard magnetorotational instability\" accepted by Nature Communications.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1038/s41467-022-32278-0", "language": "en_US" }, { "key": "dc.subject", "value": "magnetorotational instability", "language": "en_US" }, { "key": "dc.subject", "value": "MRI", "language": "en_US" }, { "key": "dc.subject", "value": "liquid metal", "language": "en_US" }, { "key": "dc.subject", "value": "Taylor-Couette flow", "language": "en_US" }, { "key": "dc.title", "value": "Identification of a non-axisymmetric mode in laboratory experiments searching for standard magnetorotational instability", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Wang, Yin", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. National Aeronautics and Space Administration (NASA) grant number NNH15AB25I", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. National Science Foundation (NSF) grant number AST-2108871", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "Max-Planck-Princeton Center for Plasma Physics (MPPC)", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 151535, "name": "Streaked Sub-ps-resolution X-ray Line Shapes and Implications for Solid-density Plasma Dynamics", "handle": "88435/dsp013n2042309", "type": "item", "link": "/rest/items/151535", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-31 14:13:13.761", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Kraus, B. Frances", "language": null }, { "key": "dc.contributor.author", "value": "Gao, Lan", "language": null }, { "key": "dc.contributor.author", "value": "Hill, K. W.", "language": null }, { "key": "dc.contributor.author", "value": "Bitter, M.", "language": null }, { "key": "dc.contributor.author", "value": "Efthimion, P. C.", "language": null }, { "key": "dc.contributor.author", "value": "Hollinger, R.", "language": null }, { "key": "dc.contributor.author", "value": "Wang, Shoujun", "language": null }, { "key": "dc.contributor.author", "value": "Song, Huanyu", "language": null }, { "key": "dc.contributor.author", "value": "Nedbailo, R.", "language": null }, { "key": "dc.contributor.author", "value": "Rocca, J. J.", "language": null }, { "key": "dc.contributor.author", "value": "Mancini, R. C.", "language": null }, { "key": "dc.contributor.author", "value": "MacDonald, M. J.", "language": null }, { "key": "dc.contributor.author", "value": "Beatty, C. B.", "language": null }, { "key": "dc.contributor.author", "value": "Shepherd, R.", "language": null }, { "key": "dc.date.accessioned", "value": "2022-08-30T02:19:46Z", "language": null }, { "key": "dc.date.available", "value": "2022-08-30T02:19:46Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp013n2042309", "language": null }, { "key": "dc.description.abstract", "value": "A high-resolution x-ray spectrometer was coupled with an ultrafast x-ray streak camera to produce time-resolved line shape spectra measured from hot, solid-density plasmas. A Bragg crystal was placed near a laser-produced plasma to maximize throughput; alignment tolerances were established by raytracing. The streak camera produced single-shot time-resolved spectra, heavily sloped due to photon time-of-flight differences, with sufficient reproducibility to accumulate photon statistics. The images are time-calibrated by the slope of streaked spectra and dewarped to generate spectra emitted at different times defined at the source. The streaked spectra demonstrate the evolution of spectral shoulders and other features on ps timescales, showing the feasibility of plasma parameter measurements on the rapid timescales necessary to study high-energy-density plasmas.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "See \"dataDescription_README.txt\" for a description of all files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Review of Scientific Instruments 2022 (publication pending)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0101853", "language": null }, { "key": "dc.subject", "value": "x-ray spectroscopy", "language": "en_US" }, { "key": "dc.subject", "value": "High-energy-density plasmas", "language": "en_US" }, { "key": "dc.title", "value": "Streaked Sub-ps-resolution X-ray Line Shapes and Implications for Solid-density Plasma Dynamics", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Kraus, B. F.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 152434, "name": "Source data for \"Observation of Axisymmetric Standard Magnetorotational Instability in the Laboratory\"", "handle": "88435/dsp018623j1954", "type": "item", "link": "/rest/items/152434", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-20 17:04:20.608", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Wang, Yin", "language": null }, { "key": "dc.contributor.author", "value": "Gilson, Erik", "language": null }, { "key": "dc.contributor.author", "value": "Ebrahimi, Fatima", "language": null }, { "key": "dc.contributor.author", "value": "Goodman, Jeremy", "language": null }, { "key": "dc.contributor.author", "value": "Ji, Hantao", "language": null }, { "key": "dc.date.accessioned", "value": "2022-09-09T03:00:25Z", "language": null }, { "key": "dc.date.available", "value": "2022-09-09T03:00:25Z", "language": null }, { "key": "dc.date.issued", "value": "2022-09", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp018623j1954", "language": null }, { "key": "dc.description.abstract", "value": "Source data for the article \"Observation of Axisymmetric Standard Magnetorotational Instability in the Laboratory\" published in Physical Review Letters.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Source data for Figure 2, Figure 4, Figure 5 and Figure 7 of the article \"Observation of Axisymmetric Standard Magnetorotational Instability in the Laboratory\" published in Physical Review Letters.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physical Review Letters, 2022, 129, 11, 115001", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1103/PhysRevLett.129.115001", "language": "en_US" }, { "key": "dc.subject", "value": "Magnetorotational Instability", "language": "en_US" }, { "key": "dc.subject", "value": "Taylor-Couette Flow", "language": "en_US" }, { "key": "dc.subject", "value": "Liquid Metal", "language": "en_US" }, { "key": "dc.subject", "value": "MHD instability", "language": "en_US" }, { "key": "dc.subject", "value": "Accretion Disk", "language": "en_US" }, { "key": "dc.title", "value": "Source data for \"Observation of Axisymmetric Standard Magnetorotational Instability in the Laboratory\"", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Wang, Yin", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "NASA (Grant No. NNH15AB25I),", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "NSF (Grant No. AST-2108871)", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "Max-Planck-Princeton Center for Plasma Physics (MPPC)", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 153992, "name": "Feasibility study of a high spatial and time resolution beam emission spectroscopy diagnostic for localized density fluctuation measurements in Lithium Tokamak eXperiment-\u03b2 (LTX-\u03b2)", "handle": "88435/dsp016969z3993", "type": "item", "link": "/rest/items/153992", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-31 14:06:32.755", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Banerjee, Santanu", "language": null }, { "key": "dc.contributor.author", "value": "Boyle, Dennis", "language": null }, { "key": "dc.contributor.author", "value": "Mann, Anurag", "language": null }, { "key": "dc.contributor.author", "value": "Majeski, Richard", "language": null }, { "key": "dc.contributor.author", "value": "Kaita, Robert", "language": null }, { "key": "dc.contributor.author", "value": "Smith, David", "language": null }, { "key": "dc.contributor.author", "value": "von Hellermann, Manfred", "language": null }, { "key": "dc.contributor.author", "value": "Hansen, Christopher", "language": null }, { "key": "dc.contributor.author", "value": "Capechhi, William", "language": null }, { "key": "dc.contributor.author", "value": "Elliott, Drew", "language": null }, { "key": "dc.date.accessioned", "value": "2022-10-01T23:55:03Z", "language": null }, { "key": "dc.date.available", "value": "2022-10-01T23:55:03Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.citation", "value": "Banerjee_2022_BESsystemfeasibility_PrincetonPlasmaPhysicsLaboratory_PrinceotnUniversityDataSpace_01", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp016969z3993", "language": null }, { "key": "dc.description.abstract", "value": "Datasets for the plots used in the aforesaid publication", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Each filename is self explanatory as per the figures in the manuscript. All files are in ascii format.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0101834", "language": null }, { "key": "dc.subject", "value": "Beam emission spectroscopy, system design", "language": "en_US" }, { "key": "dc.title", "value": "Feasibility study of a high spatial and time resolution beam emission spectroscopy diagnostic for localized density fluctuation measurements in Lithium Tokamak eXperiment-\u03b2 (LTX-\u03b2)", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Banerjee, Santanu", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 151976, "name": "Data for \"The value of fusion energy to a decarbonized United States electric grid\"", "handle": "88435/dsp012j62s808w", "type": "item", "link": "/rest/items/151976", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-04-07 10:27:23.838", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Schwartz, Jacob A.", "language": null }, { "key": "dc.contributor.author", "value": "Ricks, Wilson", "language": null }, { "key": "dc.contributor.author", "value": "Kolemen, Egemen", "language": null }, { "key": "dc.contributor.author", "value": "Jenkins, Jesse D.", "language": null }, { "key": "dc.date.accessioned", "value": "2022-10-01T23:57:17Z", "language": null }, { "key": "dc.date.available", "value": "2022-10-01T23:57:17Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.citation", "value": "Schwartz, J. A., Ricks, W., Kolemen, E., Jenkins, J.D., Data for the value of fusion energy to a decarbonized United States electric grid, Princeton Plasma Physics Laboratory, Princeton University DataSpace, http://arks.princeton.edu/ark:/88435/dsp012j62s808w", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp012j62s808w", "language": null }, { "key": "dc.identifier.uri", "value": "https://app.globus.org/file-manager?destination_id=dc43f461-0ca7-4203-848c-33a9fc00a464&destination_path=%2Ff8em-3c49%2F", "language": null }, { "key": "dc.description", "value": "This dataset is too large to download directly from this item page. You can access and download the data via Globus at this link: https://app.globus.org/file-manager?destination_id=dc43f461-0ca7-4203-848c-33a9fc00a464&destination_path=%2Ff8em-3c49%2F (See https://docs.globus.org/how-to/get-started/ for instructions on how to use Globus; sign-in is required).\"", "language": null }, { "key": "dc.description.abstract", "value": "Fusion could be a part of future decarbonized electricity systems, but it will need to compete with other technologies.\r\nIn particular, pulsed tokamaks plants have a unique operational mode, and evaluating\r\nwhich characteristics make them economically competitive can help select between design pathways.\r\nUsing a capacity expansion and operations model,\r\nwe determined cost thresholds for pulsed tokamaks to reach a range of penetration levels in a future decarbonized US Eastern Interconnection.\r\nThe required capital cost to reach a fusion capacity of 100 GW varied from $3000 to $7200/kW,\r\nand the equilibrium penetration increases rapidly with decreasing cost.\r\nThe value per unit power capacity depends on the variable operational cost and on cost of its competition, particularly fission, much more than on the pulse cycle parameters.\r\nThese findings can therefore provide initial cost targets for fusion more generally in the United States.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "See README.txt.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1016/j.joule.2023.02.006", "language": null }, { "key": "dc.relation.uri", "value": "https://zenodo.org/record/7507006#.Y7iXsezMJqs", "language": null }, { "key": "dc.subject", "value": "fusion", "language": "en_US" }, { "key": "dc.subject", "value": "economics", "language": "en_US" }, { "key": "dc.subject", "value": "cost", "language": "en_US" }, { "key": "dc.subject", "value": "value", "language": "en_US" }, { "key": "dc.subject", "value": "tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "power plant", "language": "en_US" }, { "key": "dc.title", "value": "Data for \"The value of fusion energy to a decarbonized United States electric grid\"", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Schwartz, Jacob A.", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 165169, "name": "Laboratory study of the failed torus mechanism in arched, line-tied, magnetic flux ropes", "handle": "88435/dsp0176537458f", "type": "item", "link": "/rest/items/165169", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-04-19 11:00:08.891", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Alt, Andrew", "language": null }, { "key": "dc.contributor.author", "value": "Ji, Hantao", "language": null }, { "key": "dc.contributor.author", "value": "Yoo, Jongsoo", "language": null }, { "key": "dc.contributor.author", "value": "Bose, Sayak", "language": null }, { "key": "dc.contributor.author", "value": "Goodman, Aaron", "language": null }, { "key": "dc.contributor.author", "value": "Yamada, Masaaki", "language": null }, { "key": "dc.date.accessioned", "value": "2023-02-27T16:18:02Z", "language": null }, { "key": "dc.date.available", "value": "2023-02-27T16:18:02Z", "language": null }, { "key": "dc.date.issued", "value": "2023", "language": null }, { "key": "dc.identifier.citation", "value": "A. Alt, H. Ji, J. Yoo, S. Bose, A. Goodman, and M. Yamada, 2023, Laboratory study of the failed torus mechanism in arched, line-tied, magnetic flux ropes, Princeton Plasma Physics Laboratory, Princeton University DataSpace", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp0176537458f", "language": null }, { "key": "dc.description.abstract", "value": "Coronal mass ejections (CMEs) are some of the most energetic and violent events in our solar system. The prediction and understanding of CMEs is of particular importance due to the impact that they can have on Earth-based satellite systems, and in extreme cases, ground-based electronics. CMEs often occur when long-lived magnetic flux ropes (MFRs) anchored to the solar surface destabilize and erupt away from the Sun. One potential cause for these eruptions is an ideal magnetohydrodynamic (MHD) instability such as the kink or torus instability. Previous experiments on the Magnetic Reconnection eXperiment (MRX) revealed a class of MFRs that were torus-unstable but kink-stable, which failed to erupt. These \u201cfailed-tori\u201d went through a process similar to Taylor relaxation where the toroidal current was redistributed before the eruption ultimately failed. We have investigated this behavior through additional diagnostics that measure the current distribution at the foot points and the energy distribution before and after an event. These measurements indicate that ideal MHD effects are sufficient to explain the energy distribution changes during failed torus events. This excludes Taylor relaxation as a possible mechanism of current redistribution during an event. A new model that only requires non-ideal effects in a thin layer above the electrodes is presented to explain the observed phenomena. This work broadens our understanding of the stability of MFRs and the mechanism behind the failed torus through the improved prediction of the torus instability and through new diagnostics to measure the energy inventory and current profile at the foot points.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "See ReadMe.txt for the content of the data files.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of plasmas", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0137457", "language": null }, { "key": "dc.subject", "value": "Laboratory plasma", "language": "en_US" }, { "key": "dc.subject", "value": "Flux rope", "language": "en_US" }, { "key": "dc.subject", "value": "Coronal mass ejection", "language": "en_US" }, { "key": "dc.subject", "value": "Laboratory Astrophysics", "language": "en_US" }, { "key": "dc.subject", "value": "MHD", "language": "en_US" }, { "key": "dc.subject", "value": "MRX", "language": "en_US" }, { "key": "dc.title", "value": "Laboratory study of the failed torus mechanism in arched, line-tied, magnetic flux ropes", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Alt, Andrew", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-SC0019049", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "NASA grant number 80HQTR17T0005", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 99153, "name": "Quasioptical modeling of wave beams with and without mode conversion: II. Numerical simulations of single-mode beams", "handle": "88435/dsp01qv33s0499", "type": "item", "link": "/rest/items/99153", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-08-13 05:14:15.836", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "K. Yanagihara, I. Y. Dodin, and S. Kubo", "language": null }, { "key": "dc.date.accessioned", "value": "2019-08-12T19:05:28Z", "language": null }, { "key": "dc.date.available", "value": "2019-08-12T19:05:28Z", "language": null }, { "key": "dc.date.issued", "value": "2019-08", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01qv33s0499", "language": null }, { "key": "dc.description.abstract", "value": "This work continues a series of papers where we propose an algorithm for quasioptical modeling of electromagnetic beams with and without mode conversion. The general theory was reported in the first paper of this series, where a parabolic partial differential equation was derived for the field envelope that may contain one or multiple modes with close group velocities. Here, we present a corresponding code PARADE (PAraxial RAy DEscription) and its test applications to single-mode beams in vacuum and also in inhomogeneous magnetized plasma. The numerical results are compared, respectively, with analytic formulas from Gaussian-beam optics and also with cold-plasma ray tracing. Quasioptical simulations of mode-converting beams are reported in the next, third paper of this series.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "quasioptical model", "language": "en_US" }, { "key": "dc.subject", "value": "geometrical optics", "language": "en_US" }, { "key": "dc.subject", "value": "ECRH", "language": "en_US" }, { "key": "dc.title", "value": "Quasioptical modeling of wave beams with and without mode conversion: II. Numerical simulations of single-mode beams", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 101873, "name": "Theory of the tertiary instability and the Dimits shift from reduced drift-wave models", "handle": "88435/dsp01z603r1322", "type": "item", "link": "/rest/items/101873", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-01-14 15:26:03.576", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zhu, Hongxuan", "language": null }, { "key": "dc.contributor.author", "value": "Zhou, Yao", "language": null }, { "key": "dc.contributor.author", "value": "Dodin, I. Y.", "language": null }, { "key": "dc.date.accessioned", "value": "2020-01-14T20:26:02Z", "language": null }, { "key": "dc.date.available", "value": "2020-01-14T20:26:02Z", "language": null }, { "key": "dc.date.issued", "value": "2020-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01z603r1322", "language": null }, { "key": "dc.description.abstract", "value": "Tertiary modes in electrostatic drift-wave turbulence are localized near extrema of the zonal velocity $U(x)$ with respect to the radial coordinate $x$. We argue that these modes can be described as quantum harmonic oscillators with complex frequencies, so their spectrum can be readily calculated. The corresponding growth rate $\\gamma_{\\rm TI}$ is derived within the modified Hasegawa--Wakatani model. We show that $\\gamma_{\\rm TI}$ equals the primary-instability growth rate plus a term that depends on the local $U''$; hence, the instability threshold is shifted compared to that in homogeneous turbulence. This provides a generic explanation of the well-known yet elusive Dimits shift, which we find explicitly in the Terry--Horton limit. Linearly unstable tertiary modes either saturate due to the evolution of the zonal density or generate radially propagating structures when the shear $|U'|$ is sufficiently weakened by viscosity. The Dimits regime ends when such structures are generated continuously.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physical Review Letters", "language": "en_US" }, { "key": "dc.subject", "value": "drift-wave turbulence", "language": "en_US" }, { "key": "dc.subject", "value": "zonal flows", "language": "en_US" }, { "key": "dc.subject", "value": "tertiary instability", "language": "en_US" }, { "key": "dc.subject", "value": "Dimits shift;", "language": "en_US" }, { "key": "dc.title", "value": "Theory of the tertiary instability and the Dimits shift from reduced drift-wave models", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 95831, "name": "Electron inertial effects on linearly polarized electromagnetic ion cyclotron waves at Earth's magnetosphere", "handle": "88435/dsp0105741v49m", "type": "item", "link": "/rest/items/95831", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-04-26 04:31:07.926", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Kim, Eun-Hwa", "language": null }, { "key": "dc.contributor.author", "value": "Johnson, Jay", "language": null }, { "key": "dc.contributor.author", "value": "Lee, Dong-Hun", "language": null }, { "key": "dc.date.accessioned", "value": "2019-04-25T11:51:57Z", "language": null }, { "key": "dc.date.available", "value": "2019-04-25T11:51:57Z", "language": null }, { "key": "dc.date.issued", "value": "2019-04", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp0105741v49m", "language": null }, { "key": "dc.description.abstract", "value": "We discuss a role of the electron inertial effect on linearly polarized electromagnetic ion\r\ncyclotron (EMIC) waves at Earth. The linearly polarized EMIC waves have been previously\r\nsuggested to be generated via mode conversion from the fast compressional wave at the ion-ion\r\nhybrid (IIH) resonance. When the electron inertial effects are neglected, the wave normal angle\r\nof the mode-converted IIH waves is 90 degrees because the wavevector perpendicular to the\r\nmagnetic field becomes infinite at the IIH resonance. When the electron inertial effect is\r\nconsidered, the mode-converted IIH waves can propagate across the magnetic field lines and the\r\nwavelength perpendicular to the magnetic field approaches the electron inertial length scale near\r\nthe Buchsbaum resonance. These waves are referred to as electron inertial waves. Due to the\r\nelectron inertial effect, the perpendicular wavenumber to the ambient magnetic field near the\r\nIIH resonance remains finite and the wave normal angle is less than 90 degrees. The wave normal\r\nangle where the maximum absorption occurs in a dipole magnetic field is 30-80 degrees, which\r\nis consistent with the observed values near the magnetic equator. Therefore, the numerical\r\nresults suggest that the linearly polarized EMIC wave generated via mode conversion near the\r\nIIH resonance can be detected in between the Buchsbaum and the IIH resonance frequencies,\r\nand these waves can have normal angle less than 90 degrees.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Journal of Geophysical Research", "language": "en_US" }, { "key": "dc.subject", "value": "null", "language": "en_US" }, { "key": "dc.title", "value": "Electron inertial effects on linearly polarized electromagnetic ion cyclotron waves at Earth's magnetosphere", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 98978, "name": "Verification of the global gyrokinetic stellarator code XGC-S for linear ion temperature gradient driven modes", "handle": "88435/dsp015138jh70d", "type": "item", "link": "/rest/items/98978", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-08-07 05:15:30.934", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Cole M", "language": null }, { "key": "dc.contributor.author", "value": "Hager R", "language": null }, { "key": "dc.contributor.author", "value": "Moritaka T", "language": null }, { "key": "dc.contributor.author", "value": "Dominski J", "language": null }, { "key": "dc.contributor.author", "value": "Kleiber R", "language": null }, { "key": "dc.contributor.author", "value": "Ku S", "language": null }, { "key": "dc.contributor.author", "value": "Lazerson S", "language": null }, { "key": "dc.contributor.author", "value": "Riemann J", "language": null }, { "key": "dc.contributor.author", "value": "Chang C", "language": null }, { "key": "dc.date.accessioned", "value": "2019-08-06T15:29:35Z", "language": null }, { "key": "dc.date.available", "value": "2019-08-06T15:29:35Z", "language": null }, { "key": "dc.date.issued", "value": "2019-08", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp015138jh70d", "language": null }, { "key": "dc.description.abstract", "value": "XGC (X-point Gyrokinetic Code) is a whole-volume, total-f gyrokinetic particle-in-cell code developed for modelling tokamaks.In recent work, XGC has been extended to model more general 3D toroidal magnetic configurations, such as stellarators.These improvements have resulted in the XGC-S version.In this paper, XGC-S is benchmarked in the reduced delta-f limit for linear electrostatic ion temperature gradient-driven microinstabilities, which can underlie turbulent transport in stellarators.An initial benchmark of XGC-S in tokamak geometry shows good agreement with the XGC1, ORB5, and global GENE codes.A benchmark between XGC-S and the EUTERPE global gyrokinetic code for stellarators has also been performed, this time in geometry of the optimised stellarator Wendelstein 7-X.Good agreement has been found for the mode number spectrum, mode structure, and growth rate.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": null, "language": "en_US" }, { "key": "dc.title", "value": "Verification of the global gyrokinetic stellarator code XGC-S for linear ion temperature gradient driven modes", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 97051, "name": "Comment on \u2018Numerical modeling of tokamak breakdown phase driven by pure Ohmic heating under ideal conditions\u2019", "handle": "88435/dsp015h73pz85r", "type": "item", "link": "/rest/items/97051", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-06-12 05:14:56.233", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Yoo, Min-Gu", "language": null }, { "key": "dc.contributor.author", "value": "Na, Yong-Su", "language": null }, { "key": "dc.date.accessioned", "value": "2019-06-11T20:08:14Z", "language": null }, { "key": "dc.date.available", "value": "2019-06-11T20:08:14Z", "language": null }, { "key": "dc.date.issued", "value": "2019-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp015h73pz85r", "language": null }, { "key": "dc.description.abstract", "value": "In this comment, we point out possible critical numerical flaws of recent particle simulation studies (Jiang et al 2016 Nucl. Fusion 56 126017, Peng et al 2018 Nucl. Fusion 58 026007) on the electrical gas breakdown in a simple one-dimensional periodic slab geometry. We show that their observations on the effects of the ambipolar electric fields during the breakdown, such as the sudden reversal of the ion flow direction, could not be real physical phenomena but resulting from numerical artifacts violating the momentum conservation law. We show that an incomplete implementation of the direct-implicit scheme can cause the artificial electric fields and plasma transports resulting in fallacies in simulation results. We also discuss that their simple plasma model without considering poloidal magnetic fields seriously mislead the physical mechanism of the electrical gas breakdown because it cannot reflect important dominant plasma dynamics in the poloidal plane (Yoo et al 2018 Nat. Commun. 9 3523).", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "electrical gas breakdown", "language": "en_US" }, { "key": "dc.subject", "value": "direct-implicit scheme", "language": "en_US" }, { "key": "dc.subject", "value": "particle simulation", "language": "en_US" }, { "key": "dc.subject", "value": "tokamak", "language": "en_US" }, { "key": "dc.title", "value": "Comment on \u2018Numerical modeling of tokamak breakdown phase driven by pure Ohmic heating under ideal conditions\u2019", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 96659, "name": "Nonlinear saturation and oscillations of collisionless zonal flows", "handle": "88435/dsp01m613n138p", "type": "item", "link": "/rest/items/96659", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-05-23 05:38:28.92", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zhu, Hongxuan", "language": null }, { "key": "dc.contributor.author", "value": "Zhou, Yao", "language": null }, { "key": "dc.contributor.author", "value": "Dodin, I. Y.", "language": null }, { "key": "dc.date.accessioned", "value": "2019-05-22T21:20:04Z", "language": null }, { "key": "dc.date.available", "value": "2019-05-22T21:20:04Z", "language": null }, { "key": "dc.date.issued", "value": "2019-05", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01m613n138p", "language": null }, { "key": "dc.description.abstract", "value": "In homogeneous drift-wave (DW) turbulence, zonal flows (ZFs) can be generated via a modulational instability (MI) that either saturates monotonically or leads to oscillations of the ZF energy at the nonlinear stage. This dynamics is often attributed as the predator-prey oscillations induced by ZF collisional damping; however, similar dynamics is also observed in collisionless ZFs, in which case a different mechanism must be involved. Here, we propose a semi-analytic theory that explains the transition between the oscillations and saturation of collisionless ZFs within the quasilinear Hasegawa-Mima model. By analyzing phase-space trajectories of DW quanta (driftons) within the geometrical-optics (GO) approximation, we argue that the parameter that controls this transition is N ~ \\gamma_MI/\\omega_DW, where \\gamma_MI is the MI growth rate and \\omega_DW is the linear DW frequency. We argue that at N << 1, ZFs oscillate due to the presence of so-called passing drifton trajectories, and we derive an approximate formula for the ZF amplitude as a function of time in this regime. We also show that at N >~ 1, the passing trajectories vanish and ZFs saturate monotonically, which can be attributed to phase mixing of higher-order sidebands. A modification of N that accounts for effects beyond the GO limit is also proposed. These analytic results are tested against both quasilinear and fully-nonlinear simulations. They also explain the earlier numerical results by Connaughton et al. [J. Fluid Mech. 654, 207 (2010)] and Gallagher et al. [Phys. Plasmas 19, 122115 (2012)] and offer a revised perspective on what the control parameter is that determines the transition from the oscillations to saturation of collisionless ZFs.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "New Journal of Physics", "language": "en_US" }, { "key": "dc.subject", "value": "collisionless zonal flows, modulational instability, nonlinear stage, predator-prey oscillations", "language": "en_US" }, { "key": "dc.title", "value": "Nonlinear saturation and oscillations of collisionless zonal flows", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 103595, "name": "Gyrokinetic understanding of the edge pedestal transport driven by resonant magnetic perturbations in a realistic divertor geometry", "handle": "88435/dsp01ng451m42w", "type": "item", "link": "/rest/items/103595", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-06-10 08:04:52.598", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Hager, R.", "language": null }, { "key": "dc.contributor.author", "value": "Chang, C. S.", "language": null }, { "key": "dc.contributor.author", "value": "Ferraro, N. M.", "language": null }, { "key": "dc.contributor.author", "value": "Nazikian R.", "language": null }, { "key": "dc.date.accessioned", "value": "2020-06-10T12:04:51Z", "language": null }, { "key": "dc.date.available", "value": "2020-06-10T12:04:51Z", "language": null }, { "key": "dc.date.issued", "value": "2020-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01ng451m42w", "language": null }, { "key": "dc.description.abstract", "value": "Self-consistent simulations of neoclassical and electrostatic turbulent transport in a DIII-D H-mode edge plasma under resonant magnetic perturbations (RMPs) have been performed using the global total-f gyrokinetic particle-in-cell code XGC, in order to study density-pump out and electron heat confinement.The RMP field is imported from the extended magneto-hydrodynamics (MHD) code M3D-C1, taking into account the linear two-fluid plasma response.With both neoclassical and turbulence physics considered together, the XGC simulation reproduces two key features of experimentally observed edge transport under RMPs: increased radial particle transport in the pedestal region that is sufficient to account for the experimental pump-out rate, and suppression of the electron heat flux in the steepest part of the edge pedestal.In the simulation, the density fluctuation amplitude of modes moving in the electron diamagnetic direction increases due to interaction with RMPs in the pedestal shoulder and outward, while the electron temperature fluctuation amplitude decreases.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "XGC", "language": "en_US" }, { "key": "dc.subject", "value": "DIII-D", "language": "en_US" }, { "key": "dc.subject", "value": "RMP", "language": "en_US" }, { "key": "dc.subject", "value": "turbulence", "language": "en_US" }, { "key": "dc.subject", "value": "transport", "language": "en_US" }, { "key": "dc.title", "value": "Gyrokinetic understanding of the edge pedestal transport driven by resonant magnetic perturbations in a realistic divertor geometry", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 99171, "name": "Quasioptical modeling of wave beams with and without mode conversion: III. Numerical simulations of mode-converting beams", "handle": "88435/dsp01m326m456h", "type": "item", "link": "/rest/items/99171", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-08-13 05:14:17.55", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "K. Yanagihara, I. Y. Dodin, and S. Kubo", "language": null }, { "key": "dc.date.accessioned", "value": "2019-08-12T19:06:44Z", "language": null }, { "key": "dc.date.available", "value": "2019-08-12T19:06:44Z", "language": null }, { "key": "dc.date.issued", "value": "2019-08", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01m326m456h", "language": null }, { "key": "dc.description.abstract", "value": "This work continues a series of papers where we propose an algorithm for quasioptical modeling of electromagnetic beams with and without mode conversion. The general theory was reported in the first paper of this series, where a parabolic partial differential equation was derived for the field envelope that may contain one or multiple modes with close group velocities. In the second paper, we presented a corresponding code PARADE (PAraxial RAy DEscription) and its test applications to single-mode beams. Here, we report quasioptical simulations of mode-converting beams for the first time. We also demonstrate that PARADE can model splitting of two-mode beams. The numerical results produced by PARADE show good agreement with those of one-dimensional full-wave simulations and also with conventional ray tracing (to the extent that one-dimensional and ray-tracing simulations are applicable).", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "quasioptical mode", "language": "en_US" }, { "key": "dc.subject", "value": "geometrical optics", "language": "en_US" }, { "key": "dc.subject", "value": "ECRH", "language": "en_US" }, { "key": "dc.title", "value": "Quasioptical modeling of wave beams with and without mode conversion: III. Numerical simulations of mode-converting beams", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 102251, "name": "Vertical forces during VDEs in an ITER plasma and the role of halo currents", "handle": "88435/dsp012r36v143d", "type": "item", "link": "/rest/items/102251", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-02-17 13:21:13.007", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Clasuer, C", "language": null }, { "key": "dc.contributor.author", "value": "Jardin, S", "language": null }, { "key": "dc.contributor.author", "value": "Ferraro, N", "language": null }, { "key": "dc.date.accessioned", "value": "2020-02-17T18:21:12Z", "language": null }, { "key": "dc.date.available", "value": "2020-02-17T18:21:12Z", "language": null }, { "key": "dc.date.issued", "value": "2020-02", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp012r36v143d", "language": null }, { "key": "dc.description.abstract", "value": "Vertical displacement events (VDEs) can occur in elongated tokamaks causing large currents to flow in the vessel and other adjacent metallic structures. To better understand the potential magnitude of the associated forces and the role of the so called ``halo currents'' on them, we have used the M3D-C1 code to simulate potential VDEs in ITER. We used actual values for the vessel resistivity and pre-quench temperatures and, unlike most of the previous studies, the halo region is naturally formed by triggering the thermal quench with an increase in the plasma thermal conductivity. We used the 2D non-linear version of the code and vary the post-thermal quench thermal conductivity profile as well as the boundary temperature in order to generate a wide range of possible cases that could occur in the experiment. We also show that, for a similar condition, increasing the halo current does not increase the total force on the wall since it is offset by a decrease in the toroidal contribution.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "Vertical Displacement Event", "language": "en_US" }, { "key": "dc.subject", "value": "Disruption", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "M3DC1", "language": "en_US" }, { "key": "dc.subject", "value": "ITER", "language": "en_US" }, { "key": "dc.title", "value": "Vertical forces during VDEs in an ITER plasma and the role of halo currents", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 102572, "name": "Solitary zonal structures in subcritical drift waves: a minimum model", "handle": "88435/dsp01xp68kk12s", "type": "item", "link": "/rest/items/102572", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-03-03 09:26:38.038", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Yao Zhou", "language": null }, { "key": "dc.contributor.author", "value": "Hongxuan Zhu", "language": null }, { "key": "dc.contributor.author", "value": "I. Y. Dodin", "language": null }, { "key": "dc.date.accessioned", "value": "2020-03-03T14:26:36Z", "language": null }, { "key": "dc.date.available", "value": "2020-03-03T14:26:36Z", "language": null }, { "key": "dc.date.issued", "value": "2020-03", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01xp68kk12s", "language": null }, { "key": "dc.description.abstract", "value": "{\\rtf1\\ansi\\ansicpg1252\\cocoartf1561\\cocoasubrtf610{\\fonttbl\\f0\\fswiss\\fcharset0 Helvetica;}{\\colortbl;\\red255\\green255\\blue255;\\red0\\green0\\blue0;}{\\*\\expandedcolortbl;;\\cssrgb\\c0\\c0\\c0;}\\margl1440\\margr1440\\vieww10800\\viewh8400\\viewkind0\\pard\\tx887\\tx1775\\tx2662\\tx3550\\tx4438\\tx5325\\tx6213\\tx7101\\tx7988\\tx8876\\tx9764\\tx10651\\tx11539\\tx12427\\tx13314\\tx14202\\tx15090\\tx15977\\tx16865\\tx17753\\tx18640\\tx19528\\tx20416\\tx21303\\tx22191\\tx23079\\tx23966\\tx24854\\tx25742\\tx26629\\tx27517\\tx28405\\tx29292\\tx30180\\tx31067\\tx31955\\tx32843\\tx33730\\tx34618\\tx35506\\tx36393\\tx37281\\tx38169\\tx39056\\tx39944\\tx40832\\tx41719\\tx42607\\tx43495\\tx44382\\tx45270\\tx46158\\tx47045\\tx47933\\tx48821\\tx49708\\tx50596\\tx51484\\tx52371\\tx53259\\tx54147\\tx55034\\tx55922\\tx56810\\tx57697\\tx58585\\tx59472\\tx60360\\tx61248\\tx62135\\tx63023\\tx63911\\tx64798\\tx65686\\tx66574\\tx67461\\tx68349\\tx69237\\tx70124\\tx71012\\tx71900\\tx72787\\tx73675\\tx74563\\tx75450\\tx76338\\tx77226\\tx78113\\tx79001\\tx79889\\tx80776\\tx81664\\tx82552\\tx83439\\tx84327\\tx85215\\tx86102\\tx86990\\tx87877\\tx88765\\slleading20\\pardirnatural\\partightenfactor0\\f0\\fs38 \\cf2 Solitary zonal structures have recently been identified in gyrokinetic simulations of subcritical drift-wave (DW) turbulence with background shear flows. However, the nature of these structures has not been fully understood yet. Here, we show that similar structures can be obtained within a reduced model, which complements the modified Hasegawa\\'97Mima equation with a generic primary instability and a background shear flow. We also find that these structures can be qualitatively reproduced in the modified Hasegawa\\'97Wakatani equation, which subsumes the reduced model as a limit. In particular, we illustrate that in both cases, the solitary zonal structures approximately satisfy the same \\'93equation of state\\'94, which is a local relation connecting the DW envelope with the zonal-flow velocity. Due to this generality, our reduced model can be considered as a minimum model for solitary zonal structures in subcritical DWs. }", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Physics and Controlled Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "drift waves", "language": "en_US" }, { "key": "dc.subject", "value": "zonal flows", "language": "en_US" }, { "key": "dc.subject", "value": "subcritical turbulence", "language": "en_US" }, { "key": "dc.subject", "value": "solitons", "language": "en_US" }, { "key": "dc.title", "value": "Solitary zonal structures in subcritical drift waves: a minimum model", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 96871, "name": "Formation of solitary zonal structures via the modulational instability of drift waves", "handle": "88435/dsp016h440w27m", "type": "item", "link": "/rest/items/96871", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-06-11 05:11:36.198", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zhou, Yao", "language": null }, { "key": "dc.contributor.author", "value": "Zhu, Hongxuan", "language": null }, { "key": "dc.contributor.author", "value": "Dodin, I. Y.", "language": null }, { "key": "dc.date.accessioned", "value": "2019-06-10T19:03:42Z", "language": null }, { "key": "dc.date.available", "value": "2019-06-10T19:03:42Z", "language": null }, { "key": "dc.date.issued", "value": "2019-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp016h440w27m", "language": null }, { "key": "dc.description.abstract", "value": "{\\rtf1\\ansi\\ansicpg1252\\cocoartf1561\\cocoasubrtf600\n{\\fonttbl\\f0\\fswiss\\fcharset0 Helvetica;}\n{\\colortbl;\\red255\\green255\\blue255;\\red0\\green0\\blue0;}\n{\\*\\expandedcolortbl;;\\cssrgb\\c0\\c0\\c0;}\n\\margl1440\\margr1440\\vieww10800\\viewh8400\\viewkind0\n\\pard\\tx887\\tx1775\\tx2662\\tx3550\\tx4438\\tx5325\\tx6213\\tx7101\\tx7988\\tx8876\\tx9764\\tx10651\\tx11539\\tx12427\\tx13314\\tx14202\\tx15090\\tx15977\\tx16865\\tx17753\\tx18640\\tx19528\\tx20416\\tx21303\\tx22191\\tx23079\\tx23966\\tx24854\\tx25742\\tx26629\\tx27517\\tx28405\\tx29292\\tx30180\\tx31067\\tx31955\\tx32843\\tx33730\\tx34618\\tx35506\\tx36393\\tx37281\\tx38169\\tx39056\\tx39944\\tx40832\\tx41719\\tx42607\\tx43495\\tx44382\\tx45270\\tx46158\\tx47045\\tx47933\\tx48821\\tx49708\\tx50596\\tx51484\\tx52371\\tx53259\\tx54147\\tx55034\\tx55922\\tx56810\\tx57697\\tx58585\\tx59472\\tx60360\\tx61248\\tx62135\\tx63023\\tx63911\\tx64798\\tx65686\\tx66574\\tx67461\\tx68349\\tx69237\\tx70124\\tx71012\\tx71900\\tx72787\\tx73675\\tx74563\\tx75450\\tx76338\\tx77226\\tx78113\\tx79001\\tx79889\\tx80776\\tx81664\\tx82552\\tx83439\\tx84327\\tx85215\\tx86102\\tx86990\\tx87877\\tx88765\\slleading20\\pardirnatural\\partightenfactor0\n\n\\f0\\fs38 \\cf2 The dynamics of the radial envelope of a weak coherent drift wave is approximately governed by a nonlinear Schr\\'f6dinger equation, which emerges as a limit of the modified Hasegawa\\'97Mima equation. The nonlinear Schr\\'f6dinger equation has well-known soliton solutions, and its modulational instability can naturally generate solitary structures. In this paper, we demonstrate that this simple model can adequately describe the formation of solitary zonal structures in the modified Hasegawa\\'97Mima equation, but only when the amplitude of the coherent drift wave is relatively small. At larger amplitudes, the modulational instability produces stationary zonal structures instead. Furthermore, we find that incoherent drift waves with beam-like spectra can also be modulationally unstable to the formation of solitary or stationary zonal structures, depending on the beam intensity. Notably, we show that these drift waves can be modeled as quantumlike particles (\\'93driftons\\'94) within a recently developed phase-space (Wigner\\'97Moyal) formulation, which intuitively depicts the solitary zonal structures as quasi-monochromatic drifton condensates. Quantumlike effects, such as diffraction, are essential to these condensates; hence, the latter cannot be described by wave-kinetic models that are based on the ray approximation.\\\n}", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Physics and Controlled Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "Drift waves", "language": "en_US" }, { "key": "dc.subject", "value": "Zonal flows", "language": "en_US" }, { "key": "dc.subject", "value": "Solitons", "language": "en_US" }, { "key": "dc.title", "value": "Formation of solitary zonal structures via the modulational instability of drift waves", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 103271, "name": "Deep convolutional neural networks for multi-scale time-series classification and application to disruption prediction in fusion devices", "handle": "88435/dsp013b591c48v", "type": "item", "link": "/rest/items/103271", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-05-21 11:36:24.921", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Churchill, R.M", "language": null }, { "key": "dc.contributor.author", "value": "the DIII-D team", "language": null }, { "key": "dc.date.accessioned", "value": "2020-05-21T15:36:23Z", "language": null }, { "key": "dc.date.available", "value": "2020-05-21T15:36:23Z", "language": null }, { "key": "dc.date.issued", "value": "2019-10", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp013b591c48v", "language": null }, { "key": "dc.description.abstract", "value": "The multi-scale, mutli-physics nature of fusion plasmas makes predicting plasma events challenging. Recent advances in deep convolutional neural network architectures (CNN) utilizing dilated convolutions enable accurate predictions on sequences which have long-range, multi-scale characteristics, such as the time-series generated by diagnostic instruments observing fusion plasmas. Here we apply this neural network architecture to the popular problem of disruption prediction in fusion tokamaks, utilizing raw data from a single diagnostic, the Electron Cyclotron Emission imaging (ECEi) diagnostic from the DIII-D tokamak. ECEi measures a fundamental plasma quantity (electron temperature) with high temporal resolution over the entire plasma discharge, making it sensitive to a number of potential pre-disruptions markers with different temporal and spatial scales. Promising, initial disruption prediction results are obtained training a deep CNN with large receptive field ({$\\sim$}30k), achieving an $F_1$-score of {$\\sim$}91\\% on individual time-slices using only the ECEi data.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "arxiv", "language": "en_US" }, { "key": "dc.subject", "value": "fusion", "language": "en_US" }, { "key": "dc.subject", "value": "plasma physics", "language": "en_US" }, { "key": "dc.subject", "value": "machine learning", "language": "en_US" }, { "key": "dc.subject", "value": "deep learning", "language": "en_US" }, { "key": "dc.subject", "value": "convolutional neural networks", "language": "en_US" }, { "key": "dc.subject", "value": "ECEi", "language": "en_US" }, { "key": "dc.title", "value": "Deep convolutional neural networks for multi-scale time-series classification and application to disruption prediction in fusion devices", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 103853, "name": "Theory of the tertiary instability and the Dimits shift within a scalar model", "handle": "88435/dsp016q182p06m", "type": "item", "link": "/rest/items/103853", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2020-09-02 11:07:08.724", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zhu, Hongxuan", "language": null }, { "key": "dc.contributor.author", "value": "Zhou Yao", "language": null }, { "key": "dc.contributor.author", "value": "Dodin, I.Y.", "language": null }, { "key": "dc.date.accessioned", "value": "2020-06-29T16:49:30Z", "language": null }, { "key": "dc.date.available", "value": "2020-06-29T16:49:30Z", "language": null }, { "key": "dc.date.issued", "value": "2020-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp016q182p06m", "language": null }, { "key": "dc.description.abstract", "value": "The Dimits shift is the shift between the threshold of the drift-wave primary instability and the actual onset of turbulent transport in magnetized plasma. It is generally attributed to the suppression of turbulence by zonal flows, but developing a more detailed understanding calls for consideration of specific reduced models. The modified Terry--Horton system has been proposed by St-Onge [J. Plasma Phys. {\\bf 83}, 905830504 (2017)] as a minimal model capturing the Dimits shift. Here, we use this model to develop an analytic theory of the Dimits shift and a related theory of the tertiary instability of zonal flows. We show that tertiary modes are localized near extrema of the zonal velocity $U(x)$, where $x$ is the radial coordinate. By approximating $U(x)$ with a parabola, we derive the tertiary-instability growth rate using two different methods and show that the tertiary instability is essentially the primary drift-wave instability modified by the local $U''$. Then, depending on $U''$, the tertiary instability can be suppressed or unleashed. The former corresponds to the case when zonal flows are strong enough to suppress turbulence (Dimits regime), while the latter corresponds to the case when zonal flows are unstable and turbulence develops. This understanding is different from the traditional paradigm that turbulence is controlled by the flow shear $U'$. Our analytic predictions are in agreement with direct numerical simulations of the modified Terry--Horton system.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Journal of Plasma Physics", "language": "en_US" }, { "key": "dc.subject", "value": "fusion plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "plasma instabilities", "language": "en_US" }, { "key": "dc.subject", "value": "plasma waves", "language": "en_US" }, { "key": "dc.title", "value": "Theory of the tertiary instability and the Dimits shift within a scalar model", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 101762, "name": "Intrinsic Rotation in Axisymmetric Devices", "handle": "88435/dsp01rr1721090", "type": "item", "link": "/rest/items/101762", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2019-12-26 21:48:32.704", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "T Stoltzfus-Dueck", "language": null }, { "key": "dc.date.accessioned", "value": "2019-12-27T02:48:31Z", "language": null }, { "key": "dc.date.available", "value": "2019-12-27T02:48:31Z", "language": null }, { "key": "dc.date.issued", "value": "2019-11", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01rr1721090", "language": null }, { "key": "dc.description.abstract", "value": "Toroidal rotation is critical for fusion in tokamaks, since it stabilizes instabilities that can otherwise cause disruptions or degrade confinement. Unlike present-day devices, ITER might not have enough neutral-beam torque to easily avoid these instabilities. We must therefore understand how the plasma rotates intrinsically, that is, without applied torque. Experimentally, torque-free plasmas indeed rotate, with profiles that are often non-flat and even non-monotonic. The rotation depends on many plasma parameters including collisionality and plasma current, and exhibits sudden bifurcations (rotation reversals) at critical parameter values.Since toroidal angular momentum is conserved in axisymmetric systems, and since experimentally inferred momentum transport is much too large to be neoclassical, theoretical work has focused on rotation drive by nondiffusive turbulent momentum fluxes. In the edge, intrinsic rotation relaxes to a steady state in which the total momentum outflux from the plasma vanishes. Ion drift orbits, scrape-off-layer flows, separatrix geometry, and turbulence intensity gradient all play a role. In the core, nondiffusive and viscous momentum fluxes balance to set the rotation gradient at each flux surface. Although many mechanisms have been proposed for the nondiffusive fluxes, most are treated in one of two distinct but related gyrokinetic formulations. In a radially local fluxtube, appropriate for rho star <<1, the lowest-order gyrokinetic formulations exhibit a symmetry that prohibits nondiffusive momentum flux for nonrotating plasmas in an up- down symmetric magnetic geometry with no ExB shear. Many symmetry-breaking mechanisms have been identified, but none have yet been conclusively demonstrated to drive a strong enough flux to explain commonly observed experimental rotation profiles. Radially global gyrokinetic simulations naturally include many symmetry-breaking mechanisms, and have shown cases with experimentally relevant levels of nondiffusive flux. These promising early results motivate further work to analyze, verify, and validate.This article provides a pedagogical introduction to intrinsic rotation in axisymmetric devices. Intended for both newcomers to the topic and experienced practitioners, the article reviews a broad range of topics including experimental and theoretical results for both edge and core rotation, while maintaining a focus on the underlying concepts.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Plasma Physics and Controlled Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "toroidal rotation;tokamak;transport;intrinsic rotation;rotation reversal", "language": "en_US" }, { "key": "dc.title", "value": "Intrinsic Rotation in Axisymmetric Devices", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 108959, "name": "Wave-kinetic approach to zonal-flow dynamics: recent advances", "handle": "88435/dsp01ws859j72v", "type": "item", "link": "/rest/items/108959", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-02-19 15:55:22.263", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zhu, Hongxuan", "language": "" }, { "key": "dc.contributor.author", "value": "Dodin, I. Y.", "language": "" }, { "key": "dc.date.accessioned", "value": "2021-02-19T20:55:21Z", "language": null }, { "key": "dc.date.available", "value": "2021-02-19T20:55:21Z", "language": null }, { "key": "dc.date.issued", "value": "2021-03", "language": "" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01ws859j72v", "language": null }, { "key": "dc.description.abstract", "value": "Basic physics of drift-wave turbulence and zonal flows has long been studied within the framework of wave-kinetic theory. Recently, this framework has been re-examined from first principles, which has led to more accurate yet still tractable \"improved\" wave-kinetic equations. In particular, these equations reveal an important effect of the zonal-flow \"curvature\" (the second radial derivative of the flow velocity) on dynamics and stability of drift waves and zonal flows. We overview these recent findings and present a consolidated high-level picture of (mostly quasilinear) zonal-flow physics within reduced models of drift-wave turbulence.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "fusion plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "plasma instabilities", "language": "en_US" }, { "key": "dc.subject", "value": "plasma waves", "language": "en_US" }, { "key": "dc.title", "value": "Wave-kinetic approach to zonal-flow dynamics: recent advances", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 109850, "name": "Implementation of higher-order velocity mapping between marker particles and grid in the particle-in-cell code XGC", "handle": "88435/dsp014t64gr246", "type": "item", "link": "/rest/items/109850", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-04-01 12:13:11.092", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Mollen Albert", "language": "" }, { "key": "dc.contributor.author", "value": "Adams Mark F.", "language": "" }, { "key": "dc.contributor.author", "value": "Knepley Matthew G.", "language": "" }, { "key": "dc.contributor.author", "value": "Hager Robert", "language": "" }, { "key": "dc.contributor.author", "value": "Chang C. S.", "language": "" }, { "key": "dc.date.accessioned", "value": "2021-04-01T16:13:09Z", "language": null }, { "key": "dc.date.available", "value": "2021-04-01T16:13:09Z", "language": null }, { "key": "dc.date.issued", "value": "2021-03", "language": "" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp014t64gr246", "language": null }, { "key": "dc.description.abstract", "value": "The global total-f gyrokinetic particle-in-cell code XGC, used to study transport in magnetic fusion plasmas or to couple with a core gyrokinetic code while functioning as an edge gyrokinetic code, implements a 5-dimensional (5D) continuum grid to perform the dissipative operations, such as plasma collisions, or to exchange the particle distribution function information with a core code. To transfer the distribution function between marker particles and a rectangular 2D velocity-space grid, XGC employs a bilinear mapping. The conservation of particle density and momentum is accurate enough in this bilinear operation, but the error in the particle energy conservation can become undesirably large and cause non-negligible numerical heating in a steep edge pedestal. In the present work we update XGC to use a novel mapping technique, based on the calculation of a pseudo-inverse, to exactly preserve moments up to the order of the discretization space. We describe the details of the implementation and we demonstrate the reduced interpolation error for a tokamak test plasma by using 1st- and 2nd-order elements with the pseudo-inverse method and comparing to the bilinear mapping.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Journal of Plasma Physics", "language": "en_US" }, { "key": "dc.subject", "value": "Fusion Plasma", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma Simulation", "language": "en_US" }, { "key": "dc.subject", "value": "Particle-In-Cell", "language": "en_US" }, { "key": "dc.subject", "value": "XGC", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma Transport", "language": "en_US" }, { "key": "dc.title", "value": "Implementation of higher-order velocity mapping between marker particles and grid in the particle-in-cell code XGC", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 109563, "name": "Hybrid simulations of sub-cyclotron compressional and global Alfven Eigenmode stability in spherical tokamaks", "handle": "88435/dsp0112579w33q", "type": "item", "link": "/rest/items/109563", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-04-01 12:14:48.861", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Lestz, J.B.", "language": "" }, { "key": "dc.contributor.author", "value": "Belova, E.V.", "language": "" }, { "key": "dc.contributor.author", "value": "Gorelenkov, N.N", "language": "" }, { "key": "dc.date.accessioned", "value": "2021-04-01T16:14:47Z", "language": null }, { "key": "dc.date.available", "value": "2021-04-01T16:14:47Z", "language": null }, { "key": "dc.date.issued", "value": "2021-03", "language": "" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp0112579w33q", "language": null }, { "key": "dc.description.abstract", "value": "A comprehensive numerical study has been conducted in order to investigate the stability of beam-driven, sub-cyclotron frequency compressional (CAE) and global (GAE) Alfven Eigenmodes in low aspect ratio plasmas for a wide range of beam parameters. The presence of CAEs and GAEs has previously been linked to anomalous electron temperature profile flattening at high beam power in NSTX experiments, prompting further examination of the conditions for their excitation. Linear simulations are performed with the hybrid MHD-kinetic initial value code HYM in order to capture the general Doppler-shifted cyclotron resonance that drives the modes. Three distinct types of modes are found in simulations -- co-CAEs, cntr-GAEs, and co-GAEs -- with differing spectral and stability properties. The simulations reveal that unstable GAEs are more ubiquitous than unstable CAEs, consistent with experimental observations, as they are excited at lower beam energies and generally have larger growth rates. Local analytic theory is used to explain key features of the simulation results, including the preferential excitation of different modes based on beam injection geometry and the growth rate dependence on the beam injection velocity, critical velocity, and degree of velocity space anisotropy. The background damping rate is inferred from simulations and estimated analytically for relevant sources not present in the simulation model, indicating that co-CAEs are closer to marginal stability than modes driven by the cyclotron resonances.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "readme and digital data files", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "Fast ion driven instabilities", "language": "en_US" }, { "key": "dc.subject", "value": "Compressional Alfven Eigenmodes", "language": "en_US" }, { "key": "dc.subject", "value": "Global Alfven Eigenmodes", "language": "en_US" }, { "key": "dc.subject", "value": "Hybrid simulations", "language": "en_US" }, { "key": "dc.subject", "value": "Doppler-shifted cyclotron resonance", "language": "en_US" }, { "key": "dc.title", "value": "Hybrid simulations of sub-cyclotron compressional and global Alfven Eigenmode stability in spherical tokamaks", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 115162, "name": "Topological phases and bulk-edge correspondence of magnetized cold plasmas", "handle": "88435/dsp01qj72pb21d", "type": "item", "link": "/rest/items/115162", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-06-03 09:00:47.415", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Yichen, Fu", "language": null }, { "key": "dc.contributor.author", "value": "Hong, Qin", "language": null }, { "key": "dc.date.accessioned", "value": "2021-06-03T11:18:28Z", "language": null }, { "key": "dc.date.available", "value": "2021-06-03T11:18:28Z", "language": null }, { "key": "dc.date.issued", "value": "2020", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01qj72pb21d", "language": null }, { "key": "dc.description.abstract", "value": "The \ufb01gures and related data are used to describe the topological phase in cold magnetized plasma.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "The meanings of each \ufb01le are described in the README.pdf.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Nature Communications", "language": "en_US" }, { "key": "dc.subject", "value": "topological phases", "language": "en_US" }, { "key": "dc.subject", "value": "plasma waves", "language": "en_US" }, { "key": "dc.title", "value": "Topological phases and bulk-edge correspondence of magnetized cold plasmas", "language": "en_US" }, { "key": "dc.type", "value": "Image", "language": "en_US" }, { "key": "pu.depositor", "value": "Yichen, Fu", "language": null } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 137079, "name": "Gyrokinetic simulations of momentum flux parasitic to free-energy transfer", "handle": "88435/dsp011g05ff76p", "type": "item", "link": "/rest/items/137079", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 11:12:31.674", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Stoltzfus-Dueck, T", "language": null }, { "key": "dc.contributor.author", "value": "Hornsby, W A", "language": null }, { "key": "dc.contributor.author", "value": "Grosshauser, S R", "language": null }, { "key": "dc.date.accessioned", "value": "2022-03-09T12:15:58Z", "language": null }, { "key": "dc.date.available", "value": "2022-03-09T12:15:58Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.citation", "value": "T. Stoltzfus-Dueck, W. A. Hornsby, and S. R. Grosshauser, 2022, \u201cGyrokinetic simulations of momentum flux parasitic to free-energy transfer,\u201d Princeton Plasma Physics Laboratory, Princeton University DataSpace", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp011g05ff76p", "language": null }, { "key": "dc.description.abstract", "value": "Ion Landau damping interacts with a portion of the E\u00d7B drift to cause a non-diffusive outward flux of co-current toroidal angular momentum. Quantitative evaluation of this momentum flux requires nonlinear simulations to determine fL, the fraction of fluctuation free energy that passes through ion Landau damping, in fully developed turbulence. Nonlinear gyrokinetic simulations with the GKW code confirm the presence of the systematic symmetry-breaking momentum flux. For simulations with adiabatic electrons, fL scales inversely with the ion temperature gradient, because only the ion curvature drift can transfer free energy to the electrostatic potential. Although kinetic electrons should in principle relax this restriction, the ion Landau damping measured in collisionless kinetic-electron simulations remained at low levels comparable with ion-curvature-drift transfer, except when magnetic shear was strong. A set of simulations scanning the electron pitch-angle scattering rate showed only a weak variation of fL with the electron collisionality. However, collisional-electron simulations with electron temperature greater than ion temperature unambiguously showed electron-curvature-drift transfer supporting ion Landau damping, leading to a corresponding enhancement of the symmetry-breaking momentum flux.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Data underlying the figures of \"Gyrokinetic simulations of momentum flux parasitic to free-energy transfer\". See README.txt for detailed information on the data, all of which are contained within data.h5.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton University.", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0080368", "language": "en_US" }, { "key": "dc.subject", "value": "toroidal rotation", "language": "en_US" }, { "key": "dc.subject", "value": "tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "transport", "language": "en_US" }, { "key": "dc.subject", "value": "intrinsic rotation", "language": "en_US" }, { "key": "dc.subject", "value": "rotation reversal", "language": "en_US" }, { "key": "dc.title", "value": "Gyrokinetic simulations of momentum flux parasitic to free-energy transfer", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.depositor", "value": "Stoltzfus-Dueck, Timothy", "language": null }, { "key": "dc.contributor.funder", "value": "US Dept. of Energy, Office of Science, Contract DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 137762, "name": "Effects of collisional ion orbit loss on neoclassical tokamak radial electric fields", "handle": "88435/dsp01qz20sw65g", "type": "item", "link": "/rest/items/137762", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 10:57:08.748", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zhu, Hongxuan", "language": null }, { "key": "dc.contributor.author", "value": "Stoltzfus-Dueck, T", "language": null }, { "key": "dc.contributor.author", "value": "Hager, R", "language": null }, { "key": "dc.contributor.author", "value": "Ku, S", "language": null }, { "key": "dc.contributor.author", "value": "Chang, C. S.", "language": null }, { "key": "dc.date.accessioned", "value": "2022-03-11T18:22:13Z", "language": null }, { "key": "dc.date.available", "value": "2022-03-11T18:22:13Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.citation", "value": "Hongxuan Zhu, T. Stoltzfus-Dueck, R. Hager, S. Ku, and C. S. Chang, 2022, \"Effects of collisional ion orbit loss on neoclassical tokamak radial electric fields,\" Princeton Plasma Physics Laboratory, Princeton University DataSpace.", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01qz20sw65g", "language": null }, { "key": "dc.description.abstract", "value": "Ion orbit loss is considered important for generating the radially inward electric field Er in a tokamak edge plasma. In particular, this effect is emphasized in diverted tokamaks with a magnetic X point. In neoclassical equilibria, Coulomb collisions can scatter ions onto loss orbits and generate a radially outward current, which in steady state is balanced by the radially inward current from viscosity. To quantitatively measure this loss-orbit current in an edge pedestal, an ion-orbit-flux diagnostic has been implemented in the axisymmetric version of the gyrokinetic particle-in-cell code XGC. As the first application of this diagnostic, a neoclassical DIII-D H-mode plasma is studied using gyrokinetic ions and adiabatic electrons. The validity of the diagnostic is demonstrated by studying the collisional relaxation of Er in the core. After this demonstration, the loss-orbit current is numerically measured in the edge pedestal in quasisteady state. In this plasma, it is found that the radial electric force on ions from Er approximately balances the ion radial pressure gradient in the edge pedestal, with the radial force from the plasma flow term being a minor component. The effect of orbit loss on Er is found to be only mild.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "See README.txt.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/ac5b8a", "language": "en_US" }, { "key": "dc.subject", "value": "ion orbit loss", "language": "en_US" }, { "key": "dc.subject", "value": "radial electric field", "language": "en_US" }, { "key": "dc.subject", "value": "tokamak edge plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "gyrokinetic simulations", "language": "en_US" }, { "key": "dc.title", "value": "Effects of collisional ion orbit loss on neoclassical tokamak radial electric fields", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.depositor", "value": "Zhu, Hongxuan", "language": null }, { "key": "dc.contributor.funder", "value": "U.S. Department of Energy, DE-AC02\u201309CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U.S. Department of Energy, DE-AC02- 05CH11231", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U.S. Department of Energy, SciDAC-4", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "Princeton Research Computing", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 142447, "name": "The dispersion and propagation of topological Langmuir-cyclotron waves in cold magnetized plasmas", "handle": "88435/dsp011g05ff77b", "type": "item", "link": "/rest/items/142447", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-09-21 11:11:00.281", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Fu, Yichen", "language": null }, { "key": "dc.contributor.author", "value": "Fu, Yichen", "language": null }, { "key": "dc.contributor.author", "value": "Qin, Hong", "language": null }, { "key": "dc.date.accessioned", "value": "2022-05-16T12:11:03Z", "language": null }, { "key": "dc.date.available", "value": "2022-05-16T12:11:03Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp011g05ff77b", "language": null }, { "key": "dc.description.abstract", "value": "The time evolution of the topological Langmuir-Cyclotron waves excited by an external source.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Journal of Plasma Physics", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1017/S0022377822000629", "language": "en_US" }, { "key": "dc.subject", "value": "topological waves", "language": "en_US" }, { "key": "dc.title", "value": "The dispersion and propagation of topological Langmuir-cyclotron waves in cold magnetized plasmas", "language": "en_US" }, { "key": "dc.type", "value": "moving image", "language": "en_US" }, { "key": "pu.depositor", "value": "Fu, Yichen", "language": null }, { "key": "dc.contributor.funder", "value": "U.S. Department of Energy (DE-AC02- 09CH11466).", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 167739, "name": "Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma", "handle": "88435/dsp01r494vp42z", "type": "item", "link": "/rest/items/167739", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-04-03 09:33:52.408", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Zhu, Hongxuan", "language": null }, { "key": "dc.contributor.author", "value": "Stoltzfus-Dueck, T", "language": null }, { "key": "dc.contributor.author", "value": "Hager, R", "language": null }, { "key": "dc.contributor.author", "value": "Ku, S", "language": null }, { "key": "dc.contributor.author", "value": "Chang, C. S.", "language": null }, { "key": "dc.date.accessioned", "value": "2023-04-03T13:33:50Z", "language": null }, { "key": "dc.date.available", "value": "2023-04-03T13:33:50Z", "language": null }, { "key": "dc.date.issued", "value": "2023", "language": null }, { "key": "dc.identifier.citation", "value": "Hongxuan Zhu, T. Stoltzfus-Dueck, R. Hager, S. Ku, and C. S. Chang, 2023, \"Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma,\" Princeton Plasma Physics Laboratory, Princeton University DataSpace.", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01r494vp42z", "language": null }, { "key": "dc.description.abstract", "value": "Ion orbit loss has been used to model the formation of a strong negative radial electric field Er in the tokamak edge, as well as edge momentum transport and toroidal rotation. To quantitatively measure ion orbit loss, an orbit-flux formulation has been developed and numerically applied to the gyrokinetic particle-in-cell code XGC. We study collisional ion orbit loss in an axisymmetric DIII-D L-mode plasma using gyrokinetic ions and drift-kinetic electrons. Numerical simulations, where the plasma density and temperature profiles are maintained through neutral ionization and heating, show the formation of a quasisteady negative Er in the edge. We have measured a radially outgoing ion gyrocenter flux due to collisional scattering of ions into the loss orbits, which is balanced by the radially incoming ion gyrocenter flux from confined orbits on the collisional time scale. This suggests that collisional ion orbit loss can shift Er in the negative direction compared to that in plasmas without orbit loss. It is also found that collisional ion orbit loss can contribute to a radially outgoing (counter-current) toroidal-angular-momentum flux, which is not balanced by the toroidal-angular-momentum flux carried by ions on the confined orbits. Therefore, the edge toroidal rotation shifts in the co-current direction on the collisional time scale.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/acc815", "language": "en_US" }, { "key": "dc.subject", "value": "ion orbit loss", "language": "en_US" }, { "key": "dc.subject", "value": "radial electric field", "language": "en_US" }, { "key": "dc.subject", "value": "tokamak edge plasmas", "language": "en_US" }, { "key": "dc.subject", "value": "gyrokinetic simulations", "language": "en_US" }, { "key": "dc.title", "value": "Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.depositor", "value": "Zhu, Hongxuan", "language": null }, { "key": "dc.contributor.funder", "value": "U.S. Department of Energy, DE-AC02\u201309CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U.S. Department of Energy, DE-AC02- 05CH11231", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U.S. Department of Energy, SciDAC-4", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "Princeton Research Computing", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 112982, "name": "Type-I ELM mitigation by continuous lithium granule gravitational injection into the upper tungsten divertor in EAST", "handle": "88435/dsp014x51hn09b", "type": "item", "link": "/rest/items/112982", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-05-06 11:00:06.398", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Sun, Zhen", "language": null }, { "key": "dc.contributor.author", "value": "Yuzhong, Qian", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, Rajesh", "language": null }, { "key": "dc.contributor.author", "value": "Wang, Yifeng", "language": null }, { "key": "dc.contributor.author", "value": "Wang, Yumin", "language": null }, { "key": "dc.contributor.author", "value": "Nagy, Alex", "language": null }, { "key": "dc.contributor.author", "value": "Tritz, Kevin", "language": null }, { "key": "dc.contributor.author", "value": "Lunsford, Robert", "language": null }, { "key": "dc.contributor.author", "value": "Gilson, Erik", "language": null }, { "key": "dc.contributor.author", "value": "Zuo, Guizhong", "language": null }, { "key": "dc.contributor.author", "value": "Xu, Wei", "language": null }, { "key": "dc.contributor.author", "value": "Huang, Ming", "language": null }, { "key": "dc.contributor.author", "value": "Meng, Xiancai", "language": null }, { "key": "dc.contributor.author", "value": "Mansfield, Dennis K.", "language": null }, { "key": "dc.contributor.author", "value": "Zang, Qing", "language": null }, { "key": "dc.contributor.author", "value": "Zhu, Xiang", "language": null }, { "key": "dc.contributor.author", "value": "Lin, Xin", "language": null }, { "key": "dc.contributor.author", "value": "Liu, Haiqing", "language": null }, { "key": "dc.contributor.author", "value": "Duan, Yanmin", "language": null }, { "key": "dc.contributor.author", "value": "Zhang, Ling", "language": null }, { "key": "dc.contributor.author", "value": "Lyu, Bo", "language": null }, { "key": "dc.contributor.author", "value": "Liu, Yong", "language": null }, { "key": "dc.contributor.author", "value": "Wang, Liang", "language": null }, { "key": "dc.contributor.author", "value": "Bortolon, Ale", "language": null }, { "key": "dc.contributor.author", "value": "Xu, Guosheng", "language": null }, { "key": "dc.contributor.author", "value": "Gong, Xianzu", "language": null }, { "key": "dc.contributor.author", "value": "Hu, Jiansheng", "language": null }, { "key": "dc.date.accessioned", "value": "2021-05-06T15:00:05Z", "language": null }, { "key": "dc.date.available", "value": "2021-05-06T15:00:05Z", "language": null }, { "key": "dc.date.issued", "value": "2021-04", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp014x51hn09b", "language": null }, { "key": "dc.description.abstract", "value": "Large edge-localized modes (ELMs) were mitigated by gravitational injection of lithium granules into the upper X-point region of the EAST device with tungsten plasma-facing components. The maximum ELM size was reduced by ~ 70% in high \u03b2N H-mode plasmas. Large ELM stabilization was sustained for up to about 40 energy confinement times, with constant core radiated power and no evidence of high-Z or low-Z impurity accumulation. The lithium granules injection reduced the edge plasma pedestal density and temperature and their gradients, due to increased edge radiation and reduced recycling from the plasma-facing components. Ideal stability calculations using the ELITE code indicate that the stabilization of large ELMs correlates with improved stability of intermediate-n peeling-ballooning modes, due to reduced edge current resulting from the profile changes. The pedestal pressure reduction was partially offset by a core density increase, which resulted in a modest ~ 7% drop in core stored energy and normalized energy confinement time. We surmise that the remnant small ELMs are triggered by the penetration of multiple Li granules just past the separatrix, similar to small ELMs triggered by deuterium pellet [S. Futatani et al., Nucl. Fusion 54 (2014) 073008]. This study extends previous ELM elimination with Li powder injection [R. Maingi et al., Nucl. Fusion 58 (2018) 024003] in EAST because 1) use of small, dust-like powder and the related potential health hazards were eliminated, and 2) use of macroscopic granules should be more applicable to future devices, due to deeper penetration than dust particles, e.g. inside the separatrix with velocities ~ 10 m/s in EAST.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Nuclear Fusion", "language": "en_US" }, { "key": "dc.subject", "value": "Lithium", "language": "en_US" }, { "key": "dc.subject", "value": "Impurity seeding", "language": "en_US" }, { "key": "dc.subject", "value": "Edge localized modes", "language": "en_US" }, { "key": "dc.subject", "value": "EAST", "language": "en_US" }, { "key": "dc.title", "value": "Type-I ELM mitigation by continuous lithium granule gravitational injection into the upper tungsten divertor in EAST", "language": "en_US" }, { "key": "dc.type", "value": "Article", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 115956, "name": "Observation of synergy between lower hybrid waves at two frequencies in EAST", "handle": "88435/dsp0137720g81z", "type": "item", "link": "/rest/items/115956", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-06-15 12:13:07.782", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Choi, W.", "language": null }, { "key": "dc.contributor.author", "value": "Poli, F. M.", "language": null }, { "key": "dc.contributor.author", "value": "Li, M. H.", "language": null }, { "key": "dc.contributor.author", "value": "Baek, S. G.", "language": null }, { "key": "dc.contributor.author", "value": "Gorenlenkova, M.", "language": null }, { "key": "dc.contributor.author", "value": "Ding, B. J.", "language": null }, { "key": "dc.contributor.author", "value": "Gong, X. Z.", "language": null }, { "key": "dc.contributor.author", "value": "Chan, A.", "language": null }, { "key": "dc.contributor.author", "value": "Duan, Y. M.", "language": null }, { "key": "dc.contributor.author", "value": "Hu, J. H.", "language": null }, { "key": "dc.contributor.author", "value": "Lian, H.", "language": null }, { "key": "dc.contributor.author", "value": "Lin, S. Y.", "language": null }, { "key": "dc.contributor.author", "value": "Liu, H. Q.", "language": null }, { "key": "dc.contributor.author", "value": "Qian, J. P.", "language": null }, { "key": "dc.contributor.author", "value": "Wallace, G.", "language": null }, { "key": "dc.contributor.author", "value": "Wang, Y. M.", "language": null }, { "key": "dc.contributor.author", "value": "Zang, Q.", "language": null }, { "key": "dc.contributor.author", "value": "Zhao, H. L.", "language": null }, { "key": "dc.date.accessioned", "value": "2021-06-15T16:13:06Z", "language": null }, { "key": "dc.date.available", "value": "2021-06-15T16:13:06Z", "language": null }, { "key": "dc.date.issued", "value": "2021-06", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp0137720g81z", "language": null }, { "key": "dc.description.abstract", "value": "Synergistic effects between two frequencies of lower hybrid (LH) waves\u2014operating at 2.45 and 4.6 GHz\u2014were observed in experiment on EAST for the first time. At low density (n_e,lin \u2248 2.0 \u00d7 10^19m^\u22123), simultaneous injection of a 65/35 mix of 2.45 GHz/4.6 GHz power achieved an LHCD efficiency that was 25% higher than what should be expected from the linear combination of the two sources. The experiment was interpreted with time-dependent simulations, using the equilibrium and transport solver TRANSP, coupled with the ray-tracing code GENRAY and the Fokker-Planck solver CQL3D. For each discharge, profiles of current and hard x-ray from simulation and measurement agree within uncertainties. An examination of the electron distribution function indicates that the LH synergy is supported by the increased width of the LH resonance plateau in the simultaneous injection case compared to independent injection.", "language": "en_US" }, { "key": "dc.description.sponsorship", "value": "DE-AC02-09CH1146, DE-SC0010685", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.subject", "value": "Lower hybrid synergy", "language": "en_US" }, { "key": "dc.subject", "value": "TRANSP simulation", "language": "en_US" }, { "key": "dc.title", "value": "Observation of synergy between lower hybrid waves at two frequencies in EAST", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 121613, "name": "Enhancement of edge turbulence concomitant with ELM suppression during boron powder injection in EAST", "handle": "88435/dsp01dz010t189", "type": "item", "link": "/rest/items/121613", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-31 14:29:30.863", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Sun, Zhen", "language": null }, { "key": "dc.contributor.author", "value": "Sun, Zhen", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, Rajesh", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, Ahmed", "language": null }, { "key": "dc.contributor.author", "value": "Xu, Wei", "language": null }, { "key": "dc.contributor.author", "value": "Qian, Yuzhong", "language": null }, { "key": "dc.contributor.author", "value": "Tritz, Kevin", "language": null }, { "key": "dc.contributor.author", "value": "Ye, Yang", "language": null }, { "key": "dc.contributor.author", "value": "Li, Chenglong", "language": null }, { "key": "dc.contributor.author", "value": "Xu, Zhong", "language": null }, { "key": "dc.contributor.author", "value": "Wang, Yifeng", "language": null }, { "key": "dc.contributor.author", "value": "Kaixuan, Ye", "language": null }, { "key": "dc.contributor.author", "value": "Bortolon, A.", "language": null }, { "key": "dc.contributor.author", "value": "Nagy, Alex", "language": null }, { "key": "dc.contributor.author", "value": "Zhang, Ling", "language": null }, { "key": "dc.contributor.author", "value": "Duan, Yanmin", "language": null }, { "key": "dc.contributor.author", "value": "Lu, Zhiyuan", "language": null }, { "key": "dc.contributor.author", "value": "Wang, Huiqian", "language": null }, { "key": "dc.contributor.author", "value": "Shi, Tonghui", "language": null }, { "key": "dc.contributor.author", "value": "Zhao, Hailin", "language": null }, { "key": "dc.contributor.author", "value": "Gao, Wei", "language": null }, { "key": "dc.contributor.author", "value": "Xu, Jichan", "language": null }, { "key": "dc.contributor.author", "value": "Chen, Ran", "language": null }, { "key": "dc.contributor.author", "value": "Huang, Ming", "language": null }, { "key": "dc.contributor.author", "value": "Zuo, Guizhong", "language": null }, { "key": "dc.contributor.author", "value": "Xu, Guosheng", "language": null }, { "key": "dc.contributor.author", "value": "Gong, Xianzu", "language": null }, { "key": "dc.contributor.author", "value": "Hu, Jiansheng", "language": null }, { "key": "dc.date.accessioned", "value": "2021-08-16T18:05:13Z", "language": null }, { "key": "dc.date.available", "value": "2021-08-16T18:05:13Z", "language": null }, { "key": "dc.date.issued", "value": "2021-08", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01dz010t189", "language": null }, { "key": "dc.description.abstract", "value": "Data supporting the manuscript \"Enhancement of edge turbulence concomitant with ELM suppression during boron powder injection in EAST\" published in Plasma of Physics, 2021.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "The dataset includes the data shown in the figures of the accepted paper [Z. Sun et al, 2021, Plasma of Physics].", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0058809", "language": null }, { "key": "dc.source", "value": "Raw data were generated at the EAST facility", "language": "en_US" }, { "key": "dc.subject", "value": "Boron powder", "language": "en_US" }, { "key": "dc.subject", "value": "Impurity seeding", "language": "en_US" }, { "key": "dc.subject", "value": "Edge localized modes", "language": "en_US" }, { "key": "dc.subject", "value": "EAST", "language": "en_US" }, { "key": "dc.subject", "value": "Turbulence", "language": "en_US" }, { "key": "dc.title", "value": "Enhancement of edge turbulence concomitant with ELM suppression during boron powder injection in EAST", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.type", "value": "Image", "language": "en_US" }, { "key": "pu.depositor", "value": "Sun, Zhen", "language": null }, { "key": "dc.contributor.funder", "value": "US Dept. of Energy contracts DE-AC02-09CH11466, DE-SC0016553, and DE-FC02-04ER54698", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "National Key Research and Development Program of China (2017YFA0402500, 2017YFE0301100)", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 138119, "name": "Wall conditioning and ELM mitigation with boron nitride powder injection in KSTAR", "handle": "88435/dsp01hh63t006w", "type": "item", "link": "/rest/items/138119", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-05-25 11:38:20.052", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Gilson, Erik", "language": null }, { "key": "dc.contributor.author", "value": "Lee, H", "language": null }, { "key": "dc.contributor.author", "value": "Bortolon, A", "language": null }, { "key": "dc.contributor.author", "value": "Choe, W", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, A", "language": null }, { "key": "dc.contributor.author", "value": "Hong, SH", "language": null }, { "key": "dc.contributor.author", "value": "Lee, HM", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, R", "language": null }, { "key": "dc.contributor.author", "value": "Mansfield, DK", "language": null }, { "key": "dc.contributor.author", "value": "Nagy, A", "language": null }, { "key": "dc.contributor.author", "value": "Park, SH", "language": null }, { "key": "dc.contributor.author", "value": "Song, IW", "language": null }, { "key": "dc.contributor.author", "value": "Song, JI", "language": null }, { "key": "dc.contributor.author", "value": "Yun, SW", "language": null }, { "key": "dc.contributor.author", "value": "Nazikian, R", "language": null }, { "key": "dc.date.accessioned", "value": "2022-05-25T15:38:18Z", "language": null }, { "key": "dc.date.available", "value": "2022-05-25T15:38:18Z", "language": null }, { "key": "dc.date.issued", "value": "2021-09", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01hh63t006w", "language": null }, { "key": "dc.description.abstract", "value": "Results from KSTAR powder injection experiments, in which tens of milligrams of boron nitride (BN) were dropped into low-power H-mode plasmas, show an improvement in wall conditions in subsequent discharges and, in some cases, a reduction or elimination of edge-localized modes (ELMs). Injected powder is distributed by the plasma flow and is deposited on the wall and, over the course of several discharges, was observed to gradually reduce recycling by 33%, and decrease both the ELM amplitude and frequency. This is the first demonstration of the use of BN for ELM mitigation. In all of these experiments, an Impurity Powder Dropper (IPD) was used to introduce precise, controllable amounts of the materials into ELMy H-mode KSTAR discharges. The plasma duration was between 10 s and 15 s, \ud835\udc3c\ud835\udc5d = 500 kA, \ud835\udc35\ud835\udc47 = 1.8 T, \ud835\udc43NBI = 1.6 MW, and \ud835\udc43ECH = 0.6 MW. Plasma densities were between 2 and 3 \u00d7 1019 m\u22123. In all cases, the pre-fill and startup gas-fueling was kept constant, suggesting that the decrease in baseline D\ud835\udefc emission is in fact due to a reduction in recycling. The results presented herein highlight the viability of powder injection for intra-shot and between-shot wall conditioning.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Elsevier", "language": "en_US" }, { "key": "dc.relation", "value": "Gilson et al., 2021, Wall conditioning and ELM mitigation with boron nitride powder injection in KSTAR, Princeton Plasma Physics Laboratory, Princeton University DataSapce", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1016/j.nme.2021.101043", "language": "en_US" }, { "key": "dc.title", "value": "Wall conditioning and ELM mitigation with boron nitride powder injection in KSTAR", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.depositor", "value": "Gilson, Erik", "language": null }, { "key": "dc.contributor.funder", "value": "Supported in part by U.S. Dept. of Energy under contract DE- 61 AC02-09CH11466, in part the Ministry of Science, ICT and Future 62 Planning of the Republic of Korea through the Korean ITER Tech- 63 nology R&D Program (IN2010-3), in part by the R&D Program of 64 the KSTAR Experimental Collaboration and Fusion Plasma Research 65 (EN2101-12) through the Korea Institute of Fusion Energy (KFE), and 66 in part by the National R&D Program through the National Research 67 Foundation of Korea (NRF), funded by the Ministry of Science and ICT 68 (NRF-2019M1A7A1A03087560).", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 133782, "name": "Initial Results from Boron Powder Injection Experiments in WEST Lower Single Null L-mode Plasmas", "handle": "88435/dsp01cr56n4150", "type": "item", "link": "/rest/items/133782", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-07-06 10:18:35.943", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Bodner, Grant", "language": null }, { "key": "dc.contributor.author", "value": "Gallo, Alberto", "language": null }, { "key": "dc.contributor.author", "value": "Diallo, Ahmed", "language": null }, { "key": "dc.contributor.author", "value": "Lunsford, Robert", "language": null }, { "key": "dc.contributor.author", "value": "Moreau, Philippe", "language": null }, { "key": "dc.contributor.author", "value": "Nagy, Alex", "language": null }, { "key": "dc.contributor.author", "value": "Pellissier, Francis-Pierre", "language": null }, { "key": "dc.contributor.author", "value": "Guillemaut, Christophe", "language": null }, { "key": "dc.contributor.author", "value": "Gunn, James", "language": null }, { "key": "dc.contributor.author", "value": "Bourdelle, Clarisse", "language": null }, { "key": "dc.contributor.author", "value": "Desgranges, Corinne", "language": null }, { "key": "dc.contributor.author", "value": "Manas, Pierre", "language": null }, { "key": "dc.contributor.author", "value": "Bortolon, Alessandro", "language": null }, { "key": "dc.contributor.author", "value": "Klepper, Christopher", "language": null }, { "key": "dc.contributor.author", "value": "Tsitrone, Emanuelle", "language": null }, { "key": "dc.contributor.author", "value": "Unterberg, Ezekial", "language": null }, { "key": "dc.contributor.author", "value": "Vermare, Laure", "language": null }, { "key": "dc.date.accessioned", "value": "2022-05-25T16:33:17Z", "language": null }, { "key": "dc.date.available", "value": "2022-05-25T16:33:17Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01cr56n4150", "language": null }, { "key": "dc.description.abstract", "value": "Using a recently installed impurity powder dropper (IPD), boron powder (< 150 \u03bcm) was injected into lower single null (LSN) L-mode discharges in WEST. IPDs possibly enable real-time wall conditioning of the plasma-facing components and may help to facilitate H-mode access in the full-tungsten environment of WEST. The discharges in this experiment featured Ip = 0.5 MA, BT = 3.7 T, q95 = 4.3, tpulse = 12\u201330 s, ne,0 ~ 4\u00d71019 m-2, and PLHCD ~ 4.5 MW. Estimates of the deuterium and impurity particle fluxes, derived from a combination of visible spectroscopy measurements and their corresponding S/XB coefficients, showed decreases of ~ 50% in O+, N+, and C+ populations during powder injection and a moderate reduction of these low-Z impurities (~ 50%) and W (~ 10%) in the discharges that followed powder injection. Along with the improved wall conditions, WEST discharges with B powder injection observed improved confinement, as the stored energy WMHD, neutron rate, and electron temperature Te increased significantly (10\u201325% for WMHD and 60\u2013200% for the neutron rate) at constant input power. These increases in confinement scale up with the powder drop rate and are likely due to the suppression of ion temperature gradient (ITG) turbulence from changes in Zeff and/or modifications to the electron density profile.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "README.txt should be consulted for table of contents information.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Bodner et al. 2022 Nucl. Fusion accepted", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/ac70ea", "language": "en_US" }, { "key": "dc.subject", "value": "Wall conditioning", "language": "en_US" }, { "key": "dc.subject", "value": "Powder injection", "language": "en_US" }, { "key": "dc.subject", "value": "Boronization", "language": "en_US" }, { "key": "dc.subject", "value": "Tungsten", "language": "en_US" }, { "key": "dc.title", "value": "Initial Results from Boron Powder Injection Experiments in WEST Lower Single Null L-mode Plasmas", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.depositor", "value": "Bodner, Grant", "language": null }, { "key": "dc.contributor.funder", "value": "Department of Energy", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 150055, "name": "Supplemental material for: Verification, validation, and results of an approximate model for the stress of a Tokamak toroidal field coil at the inboard midplane", "handle": "88435/dsp01rb68xg060", "type": "item", "link": "/rest/items/150055", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-08-16 14:37:38.56", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Swanson, CPS", "language": null }, { "key": "dc.contributor.author", "value": "Swanson, CPS", "language": null }, { "key": "dc.contributor.author", "value": "Kahn, S", "language": null }, { "key": "dc.contributor.author", "value": "Rana, C", "language": null }, { "key": "dc.contributor.author", "value": "Titus, PH", "language": null }, { "key": "dc.contributor.author", "value": "Brooks, AW", "language": null }, { "key": "dc.contributor.author", "value": "Guttenfelder, W", "language": null }, { "key": "dc.contributor.author", "value": "Zhai, Y", "language": null }, { "key": "dc.contributor.author", "value": "Brown, TG", "language": null }, { "key": "dc.contributor.author", "value": "Menard, JE", "language": null }, { "key": "dc.date.accessioned", "value": "2022-08-16T18:37:34Z", "language": null }, { "key": "dc.date.available", "value": "2022-08-16T18:37:34Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.citation", "value": "Swanson, CPS et al., 2022, Supplemental material for: Verification, validation, and results of an approximate model for the stress of a Tokamak toroidal field coil at the inboard midplane, Princeton Plasma Physics Laboratory, Princeton University Dataspace, ARC #", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01rb68xg060", "language": null }, { "key": "dc.description.abstract", "value": "This is the supplemental material for the manuscript \"Verification, validation, and results of an approximate model for the stress of a Tokamak toroidal field coil at the inboard midplane\" submitted to Fusion Engineering and Design. This material includes PDF writeups of the derivations of the axisymmetric extended plane strain model, the elastic properties smearing model, and 20+ MATLAB scripts and functions which implement the model and generate the figures in the paper.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "See the file README.txt", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Swanson, CPS et al., Verification, validation, and results of an approximate model for the stress of a Tokamak toroidal field coil at the inboard midplane, submitted to Fusion Engineering and Design, 2022", "language": "en_US" }, { "key": "dc.title", "value": "Supplemental material for: Verification, validation, and results of an approximate model for the stress of a Tokamak toroidal field coil at the inboard midplane", "language": "en_US" }, { "key": "dc.type", "value": "collection", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.type", "value": "Software", "language": "en_US" }, { "key": "pu.depositor", "value": "Swanson, Charles", "language": null }, { "key": "dc.contributor.funder", "value": "This work was supported by the U.S. Department of Energy under contract number DE-AC02-09CH11466.", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 141315, "name": "Topological Langmuir-cyclotron wave", "handle": "88435/dsp0179408140p", "type": "item", "link": "/rest/items/141315", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-04-19 11:01:11.193", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor", "value": "Fu, Yichen", "language": null }, { "key": "dc.contributor.author", "value": "Qin, Hong", "language": null }, { "key": "dc.contributor.author", "value": "Fu, Yichen", "language": null }, { "key": "dc.date.accessioned", "value": "2023-02-21T19:28:25Z", "language": null }, { "key": "dc.date.available", "value": "2023-02-21T19:28:25Z", "language": null }, { "key": "dc.date.issued", "value": "2022", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp0179408140p", "language": null }, { "key": "dc.description.abstract", "value": "The data set consists of the figures in a manuscript tilted Topological Langmuir-cyclotron wave. There are 10 figures with captions.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "The data set consists of the figures in a manuscript tilted Topological Langmuir-cyclotron wave. There are 10 figures with captions. The captions are listed in Readme.txt in LaTeX format.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Qin, H., & Fu, Y. (2023). Topological Langmuir-cyclotron wave. Science Advances, 9(13). https://doi.org/10.1126/sciadv.add8041", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1126/sciadv.add8041", "language": null }, { "key": "dc.subject", "value": "Topological Langmuir-Cyclotron Wave", "language": "en_US" }, { "key": "dc.subject", "value": "Topological Wave in Continuous Medium", "language": "en_US" }, { "key": "dc.subject", "value": "Index Theorem", "language": "en_US" }, { "key": "dc.subject", "value": "Bulk-Edge Correspondence", "language": "en_US" }, { "key": "dc.subject", "value": "Chern Number in Phase Space", "language": "en_US" }, { "key": "dc.title", "value": "Topological Langmuir-cyclotron wave", "language": "en_US" }, { "key": "dc.type", "value": "Image", "language": "en_US" }, { "key": "pu.depositor", "value": "Qin, Hong", "language": null }, { "key": "dc.contributor.funder", "value": "U.S. Department of Energy (DE-AC02-09CH11466)", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 158334, "name": "Electromagnetic total-f algorithm for gyrokinetic particle-in-cell simulations of boundary plasma in XGC", "handle": "88435/dsp01zw12z8539", "type": "item", "link": "/rest/items/158334", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-02-22 16:04:54.375", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Hager, Robert", "language": null }, { "key": "dc.contributor.author", "value": "Ku, Seung-Hoe", "language": null }, { "key": "dc.contributor.author", "value": "Sharma, Amil Y.", "language": null }, { "key": "dc.contributor.author", "value": "Churchill, Randy Michael", "language": null }, { "key": "dc.contributor.author", "value": "Chang, C. S.", "language": null }, { "key": "dc.contributor.author", "value": "Scheinberg, Aaron", "language": null }, { "key": "dc.date.accessioned", "value": "2023-02-22T21:04:52Z", "language": null }, { "key": "dc.date.available", "value": "2023-02-22T21:04:52Z", "language": null }, { "key": "dc.date.issued", "value": "2022-11-21", "language": null }, { "key": "dc.identifier.citation", "value": "Robert Hager, S. Ku, A. Y. Sharma, R. M. Churchill, C. S. Chang, A. Scheinberg, 2022, Electromagnetic total-f algorithm for gyrokinetic particle-in-cell simulations of boundary plasma in XGC, Princeton Plasma Physics Laboratory, Princeton University DataSpace, ARK# 88435/dsp015425kd34n", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01zw12z8539", "language": null }, { "key": "dc.description.abstract", "value": "The simplified delta-f mixed-variable/pull-back electromagnetic simulation algorithm implemented in XGC for core plasma simulations by Cole et al. [Phys. Plasmas 28, 034501 (2021)] has been generalized to a total-f electromagnetic algorithm that can include, for the first time, the boundary plasma in diverted magnetic geometry with neutral particle recycling, turbulence and neoclassical physics.\r\nThe delta-f mixed-variable/pull-back electromagnetic implementation is based on the pioneering work by Kleiber and Mischenko et al. [Kleiber et al., Phys. Plasmas 23, 032501 (2016); Mishchenko et al., Comput. Phys. Commun. 238, 194 (2019)].\r\nAn electromagnetic demonstration simulation is performed in a DIII-D-like, H-mode boundary plasma, including a corresponding comparative electrostatic simulation, which confirms that the electromagnetic simulation is necessary for a higher fidelity understanding of the electron particle and heat transport even at the low-beta pedestal foot in the vicinity of the magnetic separatrix.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "This data set includes the data visualized in figures 2-7 in \"Electromagnetic total-f algorithm for gyrokinetic particle-in-cell simulations of boundary plasma in XGC\" Physics of Plasmas 29, 112308 (2022); https://doi.org/10.1063/5.0097855. The file names indicate to which figure the data belongs. The data files themselves are in self-descriptive HDF5 format.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Theory Department", "language": "en_US" }, { "key": "dc.relation", "value": "Physics of Plasmas, 2022, 29, 11, 112308", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1063/5.0097855", "language": "en_US" }, { "key": "dc.source", "value": "Simulations with the X-point Gyrokinetic Code (XGC)", "language": "en_US" }, { "key": "dc.subject", "value": "Tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "Magnetic confinement fusion", "language": "en_US" }, { "key": "dc.subject", "value": "gyrokinetic", "language": "en_US" }, { "key": "dc.subject", "value": "XGC", "language": "en_US" }, { "key": "dc.title", "value": "Electromagnetic total-f algorithm for gyrokinetic particle-in-cell simulations of boundary plasma in XGC", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.depositor", "value": "Hager, Robert", "language": null }, { "key": "dc.contributor.funder", "value": "U.S. Department of Energy, contract no. DE-AC02\u201309CH11466, DE-AC05-00OR22725, DE-AC02-06CH11357, DE-AC02-05CH11231", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 168423, "name": "Neoclassical transport in strong gradient regions of large aspect ratio tokamaks", "handle": "88435/dsp0137720g96v", "type": "item", "link": "/rest/items/168423", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-04-05 16:20:03.782", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Trinczek, Silvia", "language": null }, { "key": "dc.contributor.author", "value": "Parra, Felix I.", "language": null }, { "key": "dc.contributor.author", "value": "Catto, Peter J.", "language": null }, { "key": "dc.contributor.author", "value": "Calvo, Iv\u00e1n", "language": null }, { "key": "dc.contributor.author", "value": "Landreman, Matt", "language": null }, { "key": "dc.date.accessioned", "value": "2023-04-05T20:20:02Z", "language": null }, { "key": "dc.date.available", "value": "2023-04-05T20:20:02Z", "language": null }, { "key": "dc.date.issued", "value": "2023", "language": null }, { "key": "dc.identifier.citation", "value": "Silvia Trinczek, Felix I. Parra, Peter J. Catto, Iv\u00e1n Calvo, Matt Landreman, 2023, \"Neoclassical transport in strong gradient regions of large aspect ratio tokamaks,\" Princeton Plasma Physics Laboratory, Princeton University DataSpace", "language": "en_US" }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp0137720g96v", "language": null }, { "key": "dc.description.abstract", "value": "We present a new neoclassical transport model for large aspect ratio tokamaks where the gradient scale lengths are of the size of the ion poloidal gyroradius. Previous work on neoclassical transport across transport barriers assumed large density and potential gradients but a small temperature gradient, or neglected the gradient of the mean parallel flow. Using large aspect ratio and low collisionality expansions, we relax these restrictive assumptions. We define a new set of variables based on conserved quantities, which simplifies the drift kinetic equation whilst keeping strong gradients, and derive equations describing the transport of particles, parallel momentum and energy by ions in the banana regime. The poloidally varying parts of density and electric potential are included. Studying contributions from both passing and trapped particles, we show that the resulting transport is dominated by trapped particles. We find that a non-zero neoclassical particle flux requires parallel momentum input which could be provided through interaction with turbulence or impurities. We derive upper and lower bounds for the energy flux across a transport barrier in both temperature and density and present example profiles and fluxes.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Journal of Plasma Physics", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.48550/arXiv.2301.07080", "language": "en_US" }, { "key": "dc.subject", "value": "Plasma Physics", "language": "en_US" }, { "key": "dc.subject", "value": "tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "neoclassical transport", "language": "en_US" }, { "key": "dc.subject", "value": "pedestal", "language": "en_US" }, { "key": "dc.title", "value": "Neoclassical transport in strong gradient regions of large aspect ratio tokamaks", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.depositor", "value": "Trinczek, Silvia", "language": null }, { "key": "dc.contributor.funder", "value": "U.S. Department of Energy, DE-AC02-09CH11466", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U.S. Department of Energy, DE-FG02-91ER-54109", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "German Academic Scholarship Foundation", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 118127, "name": "Hyperdiffusion of dust particles in a turbulent tokamak plasma", "handle": "88435/dsp01db78tg111", "type": "item", "link": "/rest/items/118127", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2021-07-08 15:59:14.185", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Nespoli, Federico", "language": null }, { "key": "dc.contributor.author", "value": "Kaganovich, Igor", "language": null }, { "key": "dc.contributor.author", "value": "Autricque, Adrien", "language": null }, { "key": "dc.contributor.author", "value": "Marandet, Yannick", "language": null }, { "key": "dc.contributor.author", "value": "Tamain, Patrick", "language": null }, { "key": "dc.date.accessioned", "value": "2021-07-08T19:59:13Z", "language": null }, { "key": "dc.date.available", "value": "2021-07-08T19:59:13Z", "language": null }, { "key": "dc.date.issued", "value": "2021-07", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01db78tg111", "language": null }, { "key": "dc.description.abstract", "value": "The effect of plasma turbulence on the trajectories of dust particles is investigated for the first time. The dynamics of dust particles is computed using the ad-hoc developed Dust Injection Simulator code, using a 3D turbulent plasma background computed with the TOKAM3X code. As a result, the evolution of the particle trajectories is governed by the ion drag force, and the shape of the trajectory is set by the Stokes number $St\\propto a_d/n_0$, with $a_d$ the dust radius and $n_0$ the density at the separatrix. The plasma turbulence is observed to scatter the dust particles, exhibiting a hyperdiffusive regime in all cases. The amplitude of the turbulent spread of the trajectories $\\Delta r^2$ is shown to depend on the ratio $Ku/St$, with $Ku\\propto u_{rms}$ the Kubo number and $u_{rms}$ the fluctuation level of the plasma flow. These results are compared with a simple analytical model, predicting $\\Delta r^2\\propto (Ku/St)^2t^3$, or $\\Delta r^2\\propto (u_{rms}n_0/a_d)^2t^3$. As the dust is heated by the plasma fluxes, thermionic emission sets the dust charge, originally negative, to slightly positive values. This results in a substantial reduction of the ion drag force through the suppression of its Coulomb scattering component. The dust grain inertia is then no longer negligible, and drives the transition from a hyperdiffusive regime towards a ballistic one.", "language": "en_US" }, { "key": "dc.description.sponsorship", "value": "This work is supported by the U.S. Department Of Energy under Contract No. DE-AC02-09CH11466 with Princeton University, and was granted access to the HPC resources of CINES, under the allocations A00505066912 and A00705066912 made by GENCI.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Physics of Plasma", "language": "en_US" }, { "key": "dc.subject", "value": "plasma turbulence", "language": "en_US" }, { "key": "dc.subject", "value": "dust", "language": "en_US" }, { "key": "dc.subject", "value": "simulations", "language": "en_US" }, { "key": "dc.subject", "value": "transport", "language": "en_US" }, { "key": "dc.title", "value": "Hyperdiffusion of dust particles in a turbulent tokamak plasma", "language": "en_US" }, { "key": "dc.type", "value": "Article", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 132717, "name": "Fusion Pilot Plant performance and the role of a Sustained High Power Density tokamak", "handle": "88435/dsp01kk91fp703", "type": "item", "link": "/rest/items/132717", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2022-01-19 17:21:30.553", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Menard, Jonathan", "language": null }, { "key": "dc.contributor.author", "value": "Grierson, Brian", "language": null }, { "key": "dc.contributor.author", "value": "Brown, Tom", "language": null }, { "key": "dc.contributor.author", "value": "Rana, Chirag", "language": null }, { "key": "dc.contributor.author", "value": "Zhai, Yuhu", "language": null }, { "key": "dc.contributor.author", "value": "Poli, Francesca", "language": null }, { "key": "dc.contributor.author", "value": "Maingi, Rajesh", "language": null }, { "key": "dc.contributor.author", "value": "Guttenfelder, Walter", "language": null }, { "key": "dc.contributor.author", "value": "Snyder, Philip", "language": null }, { "key": "dc.date.accessioned", "value": "2022-01-19T22:21:29Z", "language": null }, { "key": "dc.date.available", "value": "2022-01-19T22:21:29Z", "language": null }, { "key": "dc.date.issued", "value": "2022-01", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01kk91fp703", "language": null }, { "key": "dc.description.abstract", "value": "Recent U.S. fusion development strategy reports all recommend that the U.S. should pursue innovative science and technology to enable construction of a Fusion Pilot Plant (FPP) that produces net electricity from fusion at low capital cost. Compact tokamaks have been proposed as a means of potentially reducing the capital cost of a fusion pilot plant. However, compact steady-state tokamak FPPs face the challenge of integrating a high fraction of self-driven current with high core confinement, plasma pressure, and high divertor parallel heat flux. This integration is sufficiently challenging that a dedicated sustained-high-power-density (SHPD) tokamak facility is proposed by the U.S. community as the optimal way to close this integration gap. Performance projections for the steady-state tokamak FPP regime are presented and a preliminary SHPD device with substantial flexibility in lower aspect ratio (A=2-2.5), shaping, and divertor configuration to narrow gaps to a FPP is described.", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Original images for each of the 16 figures in the Nuclear Fusion article plus CSV or TXT files for the data in each of the figures where applicable.", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "Nuclear Fusion (https://doi.org/10.1088/1741-4326/ac49aa)", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1741-4326/ac49aa", "language": "en_US" }, { "key": "dc.subject", "value": "fusion pilot plant", "language": "en_US" }, { "key": "dc.subject", "value": "steady-state tokamak", "language": "en_US" }, { "key": "dc.subject", "value": "core-edge integration", "language": "en_US" }, { "key": "dc.subject", "value": "high-temperature superconductors", "language": "en_US" }, { "key": "dc.subject", "value": "liquid metals", "language": "en_US" }, { "key": "dc.title", "value": "Fusion Pilot Plant performance and the role of a Sustained High Power Density tokamak", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "pu.projectgrantnumber", "value": "31016 G0001 10003086 101", "language": null }, { "key": "pu.depositor", "value": "Menard, Jonathan", "language": null }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": "en_US" } ], "bitstreams": null, "archived": "true", "withdrawn": "false" }, { "id": 162608, "name": "Operational Space and Performance Limiting Events in the First Physics Campaign of MAST-U", "handle": "88435/dsp01td96k574c", "type": "item", "link": "/rest/items/162608", "expand": [ "parentCollection", "parentCollectionList", "parentCommunityList", "bitstreams", "all" ], "lastModified": "2023-01-19 14:59:32.894", "parentCollection": null, "parentCollectionList": null, "parentCommunityList": null, "metadata": [ { "key": "dc.contributor.author", "value": "Berkery, John", "language": null }, { "key": "dc.date.accessioned", "value": "2023-01-19T15:58:25Z", "language": null }, { "key": "dc.date.available", "value": "2023-01-19T15:58:25Z", "language": null }, { "key": "dc.date.created", "value": "2023-01-18", "language": null }, { "key": "dc.date.issued", "value": "2023-01-18", "language": null }, { "key": "dc.identifier.uri", "value": "http://arks.princeton.edu/ark:/88435/dsp01td96k574c", "language": null }, { "key": "dc.description", "value": "The data for reproducing each figure is included here. \r\n\r\nFor Figures 1-7 and 9b, the \"x\" and \"y\" data gives the center of the squares of the contour plots (labeled, with units, inside each file). \r\nThe \"z\" data gives the Log10 of the number of equilibria in each square (for 9b the average amplitude of the FFT).\r\n\r\nFor Figures 8, 9a, and 10, the data given are the time series of the various quantities plotted, which are labelled, with units, inside each file.", "language": "en_US" }, { "key": "dc.description.abstract", "value": "The MAST-U fusion plasma research device, the upgrade to the Mega Amp Spherical Tokamak, has recently completed its first campaign of physics operation. MAST-U operated with Ohmic, or one or two neutral beams for heating, at 400-800 kA plasma current, in conventional or \u201cSuperX\u201d divertor configurations. Equilibrium reconstructions provide key plasma physics parameters vs. time for each discharge, and diagrams are produced which show where the prevalence of operation occurred as well as the limits in various operational spaces. When compared to stability limits, the operation of MAST-U so far has generally stayed out of the low q, low density instability region, and below the high density Greenwald limit, high beta global stability limits, and high elongation vertical stability limit. MAST-U still has the potential to reach higher elongation, which could benefit the plasma performance. Despite the majority of operation happening below established stability limits, disruptions did occur in the flat-top phase of MAST-U plasmas. The reasons for these disruptions are highlighted, and possible strategies to avoid them and to extend the operational space of MAST-U in future campaigns are discussed.", "language": "en_US" }, { "key": "dc.description.sponsorship", "value": "This work was supported by the U.S. Department of Energy under contract numbers DE-AC02-09CH11466 and DE-SC0018623. The United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes.\r\nThis work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 \u2014 EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. This work has also been funded by the EPSRC [grant number EP/T012250/1] and the EPSRC Energy Programme [grant number EP/W006839/1].", "language": "en_US" }, { "key": "dc.description.tableofcontents", "value": "Readme, Fig1, Fig2, Fig3, Fig4, Fig5, Fig6, Fig7, Fig8, Fig9a, Fig9b, Fig10", "language": "en_US" }, { "key": "dc.language.iso", "value": "en_US", "language": "en_US" }, { "key": "dc.publisher", "value": "Princeton Plasma Physics Laboratory, Princeton University", "language": "en_US" }, { "key": "dc.relation", "value": "John W Berkery et al (2023), Plasma Phys. Control. Fusion, in press https://doi.org/10.1088/1361-6587/acb464", "language": "en_US" }, { "key": "dc.relation.isreferencedby", "value": "https://doi.org/10.1088/1361-6587/acb464", "language": "en_US" }, { "key": "dc.subject", "value": "Spherical Tokamak", "language": "en_US" }, { "key": "dc.title", "value": "Operational Space and Performance Limiting Events in the First Physics Campaign of MAST-U", "language": "en_US" }, { "key": "dc.type", "value": "Dataset", "language": "en_US" }, { "key": "dc.contributor.funder", "value": "U. S. Department of Energy contract number DE-AC02-09CH11466", "language": null } ], "bitstreams": null, "archived": "true", "withdrawn": "false" } ]