electron linac cell
$reg kprob=1, ; Superfish problem
dx=.1, ; X mesh spacing
freq=1000., rmass=-1,; Starting frequency in MHz, set rest mass = electron
xdri=1.,ydri=9.0 $ ; Drive point location
$po x=0.0,y=0.0 $ ; Start of the boundary points
$po x=0.0,y=10. $
$po x=5.,y=10. $
$po x=5.,y=0.0 $
$po x=0.0,y=0.0 $