no_digested

beginning[beta_a] =  10
beginning[beta_b] =  10

parameter[geometry] = open
beginning[e_tot] = 1e9

cavity2: lcavity, tracking_method = runge_kutta,  mat6_calc_method = tracking,  
field_calc = fieldmap, rf_frequency = 1.3e9,
L = 	0.568,
grid = call::grid.bmad 

dri01: pipe, l = 6
null_d: null_ele
q01: quadrupole, l = 1, superimpose, ref = null_d, offset = -4, a2 = 1, tracking_method = runge_kutta
mm: marker, superimpose, ref = cavity2

mline: line[multipass] = (dri01, null_d, cavity2) 
erlrecovery: line = (mline, mline)

use, erlrecovery