EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH
Beam Position Monitors
A beam monitor has no specific effect on the beam and behaves like a drift space.
In addition it serves to record the beam position for closed orbit
correction.
Three different types of beam position monitors are recognised:
- HMONITOR.
Monitor for the horizontal beam position,
- VMONITOR.
Monitor for the vertical beam position,
- MONITOR.
Monitor for both horizontal and vertical beam position.
label: HMONITOR, L=real;
label: VMONITOR, L=real;
label: MONITOR, L=real;
A beam position monitor has one real attribute:
- L:
The length of the monitor (default: 0 m).
Examples:
MH: HMONITOR,L=1;
MV: VMONITOR;
The straight reference system
for a monitor is a cartesian coordinate system.
Instruments
An instrument has no specific effect on the beam and behaves like a drift space.
Instruments are different from beam position monitors and are not used for closed orbit correction.
Two different types of instruments are recognised:
- INSTRUMENT.
A place holder for any type of beam instrumentation.
Optically it behaves like a drift space;
it returns no beam observation.
It represent a class of elements
which is completely independent from drifts and monitors.
- PLACEHOLDER
A place holder for any type of element.
Internally it is equivalent to an INSTRUMENT: optically it behaves as a drift space,
it returns no beam observation. It represent a class of elements
which is completely independent from drifts and monitors.
label: INSTRUMENT, L=real;
label: PLACEHOLDER, L=real;
An instrument has one real attribute:
- L:
The length of the instrument (default: 0 m).
The straight reference system
for an instrument is a cartesian coordinate system.
hansg,
June 17, 2002
Ghislain Roy, August 1st, 2014.