&dark_current_tracker_params
 lat_name           = "linac_short.lat.bmad"
 particle_file_name = "l1_n100_p50.dat"
 element_monitor_list = "LA.MAR.BEG, LA.MAR.END"
 min_charge_ratio   =   0
 save_tracks = true
 dt_save = 1e-10
 !verbose = true
/