The maximum number of particles in a Run in Geant4

[weller]

" The number of events is stored in a signed integer (G4int), with a maximum value of 2,147,483,647"

How can i simulate 10^12 particles simultaneously?

You can’t, not in a single run. The number of events is stored in a signed integer (G4int), with a maximum value of 2,147,483,647. To generate that many events, you should do five runs of maximum size in your job: /run/beamOn 2000000000 /run/beamOn 2000000000 /run/beamOn 2000000000 /run/beamOn 2000000000 /run/beamOn 2000000000 Set up your analysis code so that it either accumulates across all the runs of a job, or includes the run number (which increments with each beamOn) in the output file…