Add possibility of MSC stepping to HepEmTrackingManager #79
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This simplifies the interplay of the two because MSC works on the mean energy loss. The minor disadvantage is that the check for the tracking cut happens after MSC, which means that a particle might scatter only to be killed afterwards. This is very rare and not of pratical relevance in terms of performance, but leads to minor changes even in case loss fluctuations are turned off.
Introduce a temporary storage for pre-step kinetic energy in G4HepEmElectronTrack.
If a step is only limited by MSC, the HepEmTrackingManager can re-try the step with the remaining distance to the discrete interaction, without applying energy loss fluctuations and re-computing the cross sections. This option is enabled by default because it provides a small performance benefit, but can be turned off to get results identical to the G4HepEmProcess.
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If a step is only limited by MSC, the
HepEmTrackingManagercan re-try the step with the remaining distance to the discrete interaction, without applying energy loss fluctuations and re-computing the cross sections. This option is enabled by default because it provides a small performance benefit, but can be turned off to get results identical to theG4HepEmProcess.