/run/verbose 1
#detector geometry
/xtal/setMaterial G4_Si
/xtal/setAngle 0. -25.25E-6 0. rad
/xtal/setSize 1.0 70. 1.94 mm
/xtal/setBR 38.416 0. 0. m
/xtal/setEC data/Si220pl

#initialize run before stacking and primary generator actions
/run/initialize

#set gps properties
/gps/ene/mono 400. GeV
/gps/particle proton

/gps/pos/type Point
/gps/pos/centre 0 0 -10.5 m

/gps/ang/type beam2d
/gps/ang/rot1 1  0  0
/gps/ang/rot2 0 -1  0
/gps/ang/sigma_x 13.36E-6 rad
/gps/ang/sigma_y 11.25E-6 rad

#beam on
/run/beamOn 1000