sky.mac

###################################################
# Batch running of event simulating
# isotropic gammas from the sky.
###################################################

# If you need to see details about the physics
# list, you can use the following. It's also part of
# the output of "./gramsg4 -v".
#/process/em/verbose 1
#/process/had/verbose 1

# In GramsG4, every .mac file must contain this
# line after any physics/geometry/thread setup,
# but before any generation/visualization commands.
/run/initialize

# The particles: gammas using the energy spectrum in
# energyflux.txt. See scripts/Hist2Text.C for how to convert a ROOT
# histogram into Geant4's simple histogram text format.

/gps/particle gamma 
/gps/ene/type Arb
/gps/hist/type arb
/gps/hist/file scripts/energyflux.txt
/gps/hist/inter Lin

# Put the detector in the middle of a sphere, to simulate isotropic
# radiation from the sky. Recall that z=0 is located at the induction
# plane, so we have to adjust things a bit to focus the particles
# from the sphere on the center (or centre!) of the detector. 

/gps/pos/type Surface
/gps/pos/shape Sphere
/gps/pos/radius 3 m
/gps/pos/centre 0 0 -0.1 m

/gps/ang/type focused
/gps/ang/focuspoint 0 0 -0.1 m

# This means "run Geant4 and generate 1000 events"
/run/beamOn 1000

exit