q:        charge, total=1e-10
samp:     sample, fraction=1

unit_l:   drift, l=0.45
d:        drift, l=1.0e-7
ibs:      ibscatter, nslice=16384, isring=1, bunched_beam_mode=1, verbose=0

unit_ibs: line = (unit_l, unit_l, ibs)

linac:    line = (q, 10*unit_ibs)