I’m simulating, using Geant4 10.6.p01 (G4EmStandardPhysics_option4 physics list), the propagation through high-pressure xenon (10 bar) of electrons of 1–2 MeV of energy. I’m using the
G4StepLimiter process to limit the maximum step length of the electrons to 1 mm to get finely segmented tracks. This appears to have a non-negligible impact on the simulation of multiple scattering. See, for example, the average scattering angle as a function of the kinetic energy of the electron for events in which the maximum step length has been limited to 1 mm compared to the case in which it hasn’t been limited:
cosine_kinetic_profileX.pdf (16.0 KB)
This difference has a direct impact on the volume extent of the tracks (not the total track length):
volume_hist.pdf (15.0 KB)
The step-limited results happen to be closer to our data. Therefore, I was wondering whether this result is in agreement with what should be expected from Geant4’s msc model. If that is the case, can I get higher precision limiting the maximum step length even more?