Dear Sir, 1. Currently I am using G4-v10.04.p02. In my simulation, I want to change the value of the skin, Range Factor, and Geom Factor for proton. But, I do not know how to modify those values. /process/msc/RangeFactorMuHad 0.1 I used this comment to change the range factor value. However, the results are almost equal. Any other possible ways to modify those values? 2. How to find the UseSafetyPlus information form Geant4 for proton. In addition, for other step limits information’s (fminimal, fUseSafety, fUseDistanceToBounder). Thank you…
Hello, please, note, that you use Bugzilla bug report system, which intended to reports of bugs. What is posted by you is a request for help, which is different.Better to have this discussion in User Forum. However, I will try to answer below. Note, that it is difficult to comment in general. I would suggest, that you take $G4INSTALL/examples/extended/electromagnetic/TestEm5 Inside this example there are many macro files but you may have your own - you may copy one and after edit it. You compile Geant4, after the example and play with your macro file. 1. This is not clear to me. Are you sure, that the command does not work? You may have a look into initialisation printout before the run where list of EM models is printed. Does RangeFactor for proton changed or not? If the value changed from 0.2 to 0.1, this means that this UI commands works, if results are not changed much, this parameter not affect given result in a significant way. 2. Note, that step limitation is different for different multiple scattering models. Skin, RangeFactor, and GeomFactor for proton are used by the Urban model. The default WVI model uses mainly RangeFactor, only if DistanceToBoundary option is applied GeomFactor is used. For WVI Simple, UseSafety, UseSafetyPlus are the same. 3. We have also GS model but it is applicable to electrons and positrons, not for protons. I will close this ticket but if you have further questions, you may post indeed. VI
