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\begin{tikzpicture}[scale=0.7]
\draw [fill=blue!40] (0,0) ellipse [x radius=3mm, y radius=1cm];
\draw [|-|] (-1,1) -- ++(0,-2) node [pos=0.5,fill=white] {$w$};
\draw [|-|] (-0.3,-1.4) -- ++(0.6,0) node [pos=0.5,below] {$l$};
\node at (0, 1.4) {Electron Pulse};
\draw [thick, ->] (0.3,0) -- ++ (1,0) node [above,pos=1] {$\vec{v} = v \hat{z}$};
\draw
(3,2)
to [out=-75,in=75] ++(0,-4)
to [out=105,in=255] ++(0,4)
node [above] {Magnetic Lens}
;
\draw [fill=gray!50] (5,1.5) rectangle ++(1,-3);
\node at (5.5,-2.2) [align=center] {RF Cavity\\``z lens''};
\draw
(8,2)
to [out=-75,in=75] ++(0,-4)
to [out=105,in=255] ++(0,4)
node [above] {Magnetic Lens}
;
\end{tikzpicture}