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Forum: Processes Involving Optical Photons
Re: Question Cerenkov radiation production below threshold
Date: 31 Aug, 2012
From: Gumplinger Peter <Gumplinger Peter>

Hi Esther,

The routine you need to understand is: G4Cerenkov::GetAverageNumberOfPhotons

http://www-geant4.kek.jp/lxr/source/processes/electromagnetic/xrays/src/G4Cerenkov.cc#L577

No Cerenkov photons are generated when n(Pmax) < 1/beta. You are providing the array of index of refraction as a function of photon energy. If you want your expected threshold to be respected, you'll have to make sure that the n of your maximum specified energy does not exceed 1/beta, where beta is that of a 263 keV positron.

FYI, I won't be able to reply again to any posting you may do on this thread until after Sept. 12.

Peter

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