\begin{tikzpicture}[
  scale=0.7,
  y=-1cm,
  electron/.style={color=blue!40},
  electron multi/.style={blue,style=ultra thin,top color=blue},
  dynode/.style={thick, black, line width=2.5},
  pmt/.style={thick, gray},
  shield/.style={line width=2., gray}
]
\draw[pmt] (10.7,4.4) +(-103:0.92195) arc (-103:-13:0.92195);
\draw[pmt] (10.73684,5.6579) +(106:0.87478) arc (106:9:0.87478);

\definecolor{penColor}{rgb}{1,0.84314,0}
\draw[thick,penColor,fill=white] (11.125,5) +(-113:1.625) arc (-113:-247:1.625);
\draw[pmt] (11.6,4.2) -- (15,4.2) -- (15,5.8) -- (11.6,5.8);

%% \draw[color=white!95!black, line width=1.5] (9,3.01) -- (9,6.99);
%% \draw[color=white, line width=1.5] (10.5,6.5) -- (10.5,3.5);

%% Electron multiplication
\draw[->,blue] (9.6,4.4) -- (11.9,5.5);
\draw[electron] (11.9,5.5) -- (12.2,4.65);
\draw[electron] (11.9,5.5) -- (12.3,4.65);
\draw[electron] (11.9,5.5) -- (12.5,4.5);
\draw[electron] (12.5,4.5) -- (13.1,5.35);
\draw[electron] (12.5,4.5) -- (13,5.4);
\draw[electron] (12.5,4.5) -- (12.9,5.45);
\draw[electron] (12.3,4.65) -- (13,5.4);
\draw[electron] (12.3,4.65) -- (12.8,5.5);
\draw[electron] (12.2,4.65) -- (12.7,5.55);
\draw[electron] (12.2,4.65) -- (12.6,5.6);
\draw[electron] (12.2,4.65) -- (12.8,5.5);
\draw[electron] (13.1,5.3) -- (13.5,4.5);
\draw[electron] (13.1,5.3) -- (13.4,4.5);
\draw[electron] (13.1,5.3) -- (13.3,4.6);
\draw[electron] (12.9,5.4) -- (13.2,4.6);
\draw[electron] (12.6,5.6) -- (13.1,4.7);
\draw[electron] (12.7,5.5) -- (13.2,4.6);
\draw[electron] (13.1,5.3) -- (13.2,4.6);
\draw[electron] (13,5.4) -- (13.1,4.6);
\draw[electron] (12.9,5.4) -- (13,4.7);
\draw[electron] (13.1,5.3) -- (13.3,4.5);
\draw[electron] (13,5.3) -- (13.2,4.6);
\draw[electron] (12.8,5.4) -- (13.2,4.6);
\draw[electron] (12.7,5.5) -- (13.6,4.4);
\draw[electron] (13,5.4) -- (13.4,4.5);

\shadedraw[electron multi] (13.1,4.6) -- (13.5,5.6) -- (13.95,5.4) -- (13.5,4.5) -- (13.1,4.6);

%% Dynode
\draw[dynode] (12.1,4.7) -- (12.7,4.4);
\draw[dynode,xshift=0.9cm] (12.1,4.7) -- (12.7,4.4);
\draw[dynode] (11.62,5.64) -- (12.22,5.34);
\draw[dynode,xshift=0.9cm] (11.62,5.64) -- (12.22,5.34);
\draw[dynode,xshift=1.8cm] (11.62,5.64) -- (12.22,5.34);

%% Magnetic shield
\draw[shield] (8,7.1) -- (12,7.1) -- (12, 6) -- (16, 6);
\draw[shield] (8,2.9) -- (12,2.9) -- (12, 4) -- (16, 4);

\draw[thick,<-,gray] (7.8,7.1) -- (6, 7.8);
\path (7.2,8.3) node[anchor=base east] {\small{\sffamily\textcolor{gray}{magnetic shield}}};

%% Chassis HT & MATACQ
\draw[thick,-,red] (15.,4.8) .. controls +(1,0) and +(.0,0.) .. (16.9, 3.4);
\path (18.6,3.2) node[anchor=base east] {\small{\sffamily\textcolor{red}{High Voltage}}};
\draw[thick,-,black] (15.,5.3) .. controls +(1,0) and +(.0,0.) .. (16.9, 6.7);
\path (20.5,7.0) node[anchor=base east] {\small{\sffamily MATACQ acquisition}};

%% champ magnétique
\path (10.2,8.0) node[] {\sf\huge{$\uparrow$}\large{$\vec{B}\sim\unit[25]{G}$}};

%% distance
\draw[thick,->] (8,5) -- (9.5,5);
\path (6,4.5) node {\sf\small{shield entrance $\rightarrow$ PMT}};
\path (6,5.0) node {\sf\small{(bottom x-axis)}};

\draw[thick,->] (12,2.5) -- (9.5,2.5);
\path (11,1.5) node {\sf\small{end of the hexa. head $\rightarrow$ PMT}};
\path (11,2) node {\sf\small{(top x-axis)}};



\end{tikzpicture}%
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