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Question Precision of calculations in Geant4 

Forum: Event and Track Management
Date: 09 Dec, 2010
From: Maciej Sznajder <Maciej Sznajder>

Hello Forum:)

I have got a problem with very simple physical experiment. I shoot one proton to the detector which is an Aluminium foil with thickness 8 mu m. By use of the G4hMultipleScattering (one of the physical process which I use in the physics list) I have got a good result, the 100keV proton stops in about 1 mu m. I can compare the result with SRIM code. BUT number of events for this proton is: 2. So the proton hit the detector (first event) and it stops (second event).

I can switch off G4hMultipleScattering and switch on G4CoulombScattering. The result is also correct, the proton stops at depth approx. 1 mu m. But in that case I have got approx. 15 000 events!! I also use G4hIonisation and G4hBremsstrahlung (Bremstrahlung just in case:p)

NOW, in the SRIM code I have got approx. 25 events for one proton which travels through the detector. Is there a possibility to change precision of calculations??, because 15 000 events (for G4CoulombScattering) is to much and 2 events (for G4hMultipleScattering) is to small. In my problem I need more data then 2 events, but not to much, like 15000 events.

Best regards, Sznajder

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1 None: Re: Precision of calculations in Geant4   (Marc Verderi - 09 Dec, 2010)
(_ Note: Re: Precision of calculations in Geant4   (Maciej Sznajder - 09 Dec, 2010)
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