cavity9: lcavity, tracking_method = runge_kutta,  mat6_calc_method = tracking,  
field_calc = fieldmap, rf_frequency = 1.3e9,
L = 	1.35	,
grid_field = call::cavity9_grid.bmad
CALL, FILE = cavity9_wall.bmad

!cavity9_reverse: lcavity, tracking_method = runge_kutta, mat6_calc_method = tracking,  
!field_calc = fieldmap, rf_frequency = 1.3e9,
!L = 	1.35	,
!field = { 
! mode = {
! m = 0,
!!! harmonic = 1,
!!! master_scale = field_scale,   !To be used when autophasing is off
!grid = call::cavity9_reverse_grid.bmad }}
!CALL, FILE = cavity9_reverse_wall.bmad