eic setup for Zafar Ahmed
solenoid is JLEIC det1 solenoid_hybrid_v1 with its side wall coil turned off
det1_dipolebig_simple.dat define field along Y axis, with streng and position. det1.pl has a holder for dipolebig which controls field size field holder position in det1.pl has to match field position in det1_dipolebig_simple.dat
det1.pl also defines a few virtual planes.