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Forum: Processes Involving Optical Photons
Re: Question Question about dielectric_LUT type optical surface (Young)
Re: Feedback Re: Question about dielectric_LUT type optical surface (Gumplinger Peter)
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Re: Feedback Re: Question about dielectric_LUT type optical surface (Gumplinger Peter)
Re: None Re: Question about dielectric_LUT type optical surface (Young)
Date: 16 Apr, 2013
From: Erik Dietz-Laursonn <Erik Dietz-Laursonn>

I found the same problem in my simulation. I used groundteflonair with sigma_alpha = 5.0 * deg to wrap a 10x1x10cm scintillator tile. As you can see in http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2013/04/16/02.42-2785-escapingPhotons.png, the escaping photons (about 2% of all photons) seem to leave the scintillator at the edges, as Young Ho Shin found out, too.

Additionally, the angular distribution looks strange. http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2013/04/16/02.42-21863-ons_hit_angle_on_SiPM.png shows distribution of the incidence angle (0 is vertical) of photons hitting the scintillator surface (in two 3x3mm areas -> SiPM A & B). You can see, that there are equidistant spikes, which should not be where. At least I cannot reproduce them when using an additional wrapping volume instead of the LUT-wrapping ( http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2013/04/16/04.35-38841-ons_hit_angle_on_SiPM.png ). And also the shape of the angular distribution for the LUT-wrapping is not clear to me. Does anyone know why it looks like that?

Best regards, Erik

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