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Question Forced Bremsstrahlung only once 

Forum: Event and Track Management
Date: 30 Jan, 2015
From: Dipanwita Banerjee <Dipanwita Banerjee>

Dear Sir,
         I would like to estimate my background of Bremsstrahlung interactions of a 20 GeV electron beam in a 5micron Tungsten target. As the cross-section is quite low I would like to force the Bremsstrahlung interactions in the volume every event to improve my statistics. However I want the interaction to occur only once and not more. I have tried overwriting the mean free path and the cross-section. In either case as its probabilistic putting the mean free path to my target thickness doesn't help as the interaction can occur before or after the mfp distance and this does not ensure one interaction always. If I increase the cross-section there are too many interactions per event. If I change the cross-section such that the mfp would come to the target thickness again I may have more than one or no interaction at all in some instance. 

I checked that Geant4 calculates the interaction points before the start of the run, so i can't put a flag that if one interaction occurs the cross-section should go to 0, as they are pre-calculated.

Is there a way to achieve what I am trying to do. That is one bremsstrahlung interaction each event in a 5 micron target.

Thanks, Dipanwita

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1 None: Re: Forced Bremsstrahlung only once   (Marc Verderi - 30 Jan, 2015)
(_ Question: Re: Forced Bremsstrahlung only once   (Dipanwita Banerjee - 30 Jan, 2015)
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