BEGINNING[BETA_A]  = 50
BEGINNING[ALPHA_A]=  0
BEGINNING[BETA_B] = 50
BEGINNING[ALPHA_B] = 0

PARAMETER[particle] = electron
parameter[geometry] = open
parameter[absolute_time_tracking] = T

parameter[p0c] = 0


call, file = apex_gun.bmad
gun: apex_gun    
    
gun[voltage] = 750e3
gun[autoscale_amplitude ]  = T
gun[autoscale_phase ]  = T

m1:marker

lat: LINE = (gun, m1)

use, lat