parameter[ran_seed] = 100
no_digested
parameter[particle] = electron
parameter[geometry] = open
beginning[p0c] =   200e6
beginning[beta_a] = 10 
beginning[beta_b] = 10
beginning[alpha_a] = 0
beginning[alpha_b] = 0

c: converter, species_out = positron, call::converter.bmad, alias = abc, p0c = 4e8

l1: line = (c)
use, l1