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I'm having trouble understanding the output of TestEm15. If I run the example in its default mode, I force MSC to occur at every step. However, if I "activate" ionization and Bremms in the electron.mac example, every step is associated with either an eIoni or Bremm and there are no MSC processes registered. Presumably, this means that the pathlength for eIoni and Bremm are much shorter than MSC --when I increase the density of water, MSC events do occur even with ionization & bremm turned on.
I guess I don't understand the relevance of "forcing" MSC at each step. I also don't understand the importance of the "ratings" in the processes (see below).
pmanager->AddProcess(new G4eIonisation, -1, 1, 1); pmanager->AddProcess(new G4eBremsstrahlung, -1, 2, 2);
Doesn't GEANT4 determine the next process by determining the smallest physical step size? What is the numbering scheme meant to do in AddProcess?
I'm actually interested in determining the interactions of electrons in a thin target, say a gas at 1 atm. Is there a specific model in GEANT4 that I should invoke for this application?
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