|Message: Re: How to count the number and their energies of secondary electrons from ionisation||Not Logged In (login)|
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On Mon, 12 May 2008, Xiaoning Ding wrote: > *** Discussion title: Event and Track Management > Email replies to PublicHyperNews@slac.stanford.edu must include: > In-Reply-To: <"/eventtrackmanage/810"@geant4-hn.slac.stanford.edu> > Subject: ...change this to be about your reply. > > I am investigate the possible of using Geant4 to simulate the respond of > ionization chamber in a proton beam. What I am interested is the > secondary electrons which are generated in the ionization chamber -- > their number and energies. > > In order to check the secondary electron out, I implemented my approach > in the method of PreUserTrackingAction () in class TrackingAction to > count the number and energy for secondary electron generated in the > ionization chamber. > > One problem I have is that all secondary electrons generated in the > ionization chamber have their energies > 1 KeV, without a single > exception. Is it somehow related to the energy cut ? > > Is there any better approch for counting secondary electron generated in > ionization chamber ? Thank you so much in advance. > Hello, 1) This question better to post in emprocess forum. 2) The default limit 1 keV for the cut in range can be overwritten: G4double lowlimit=10*eV; G4ProductionCutsTable::GetProductionCutsTable()->SetEnergyRange(lowlimit,100*GeV); 3) There are two methods for simulation for gaseous detectors: - use PAI mode (examples/extended/electromagnetic/TestEm8) - develop a user model whihc transforms energy deposition at a step into number of ionisations VI
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