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Question Angular distribution of photons 

Forum: Processes Involving Optical Photons
Date: 23 Oct, 2014
From: <Frank>

I'm interested in the angular distribution of optical photons arrival on a sensitive detector. I'm getting a distribution with a lot of ups and downs in alternance (see attached figure). I'm using this formula to get the arrival angles :

180.0 - std::acos(aStep->GetTrack()->GetMomentumDirection().z())*180.0/PI;

The distribution ending angle 47deg seems right since it is the total internal refraction angle of the two materials before the detector. The ups and downs alternance comes from the MomentumDirection().z() as I see a similar ups&downs distribution. I don't know if this is real or maybe a binning effect because if I set the bins larger, I get a smooth distribution (because all ups are followed by downs). Why would some momentum directions be that enhanced over other ones?

Thanks!

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      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/10/23/07.44-36948-AngularDistribution.png

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1 Feedback: Re: Angular distribution of photons   (Gumplinger Peter - 23 Oct, 2014)
(_ None: Re: Angular distribution of photons   (Frank - 24 Oct, 2014)
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