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Feedback Re: Potential G4 bug!? Optical Photon not getting stopped 

Keywords: Scintillation OptcialPhoton Error at Runtime
Forum: Processes Involving Optical Photons
Date: 20 Apr, 2006
From: Gumplinger Peter <Gumplinger Peter>

Hi Joerg,

Thanks for your detailed posting explaining your problem. I can't say for sure, of course, but I do not think that your findings are indicative of a bug in G4. I rather suspect that your simulation is too idealistic in that your surfaces are unphysically polished - perfectly smooth - and that you have not specified a bulk absorption of the medium in which the photons bounce around. So, for a large number of photons it may well eventually happen that you create one that just bounces around in this perfect geometry for 7km without ever hitting an absorbing PMT (I assume that your PMT is the only place in your simulation that can "swallow up photons"). To the best of my knowledge, but you should verify this, the bulk absorption length in LXe is about 35cm.

Sorry for the belated reply I was on vacation.

Greetings, Peter

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