On-Axis Coupled Cavity, Frequency scan over 100 MHz    
[courtesy of R. Cooper]

&reg kprob=1,    ; Superfish problem
nstep=81,        ; Number of steps in frequency scan
delfr=1.25,      ; Frequency step in MHz
freqs=750.0,     ; Starting frequency in MHz
ccl=1,           ; Coupled-cavity linac cell
dphi=180,        ; Phase change over the cell length
dx=0.2,          ; Mesh spacing
xdri=1.,         ; Drive point X coordinate 
ydri=8., &       ; Drive point Y coordinate 

&po x=0.,y=0. &
&po x=0.,y=16.24 &
&po x=1.4899,y=16.24 &
&po nt=2,x0=1.4899,y0=10.74,x=5.5,y=0.0 &
&po x=6.9899,y=7.64 &
&po nt=2,x0=7.85895,y0=7.64,y=0,x=0.86905 &
&po x=8.728,y=17.2 &
&po x=9.4,y=17.2 &
&po x=9.4,y=0. &
&po x=0.,y=0. &