opt_begin: fork, to_line = opt_line, superimpose, ref = osc_pickup, ref_origin = end
opt_end: marker, superimpose, ref = osc_kicker, ref_origin = beginning
lens1: lens

to_cesr: fork, to_line = cesr, to_element = opt_end
d1: drift, l = 5.49050

opt_line: line = (d1, lens1, d1, to_cesr)
opt_line[geometry] = open
opt_line[particle] = photon
opt_line[e_tot] = 1e3

call, file = mpe_1gev.bmad