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Question Re: No reflection at reflector surface 

Forum: Processes Involving Optical Photons
Re: None No reflection at reflector surface (Athreya Shankar)
Date: 01 Jun, 2011
From: Athreya Shankar <Athreya Shankar>

hello, i figured out that using G4SubtractionSolid was causing the problem, and now I have built my reflectors slab by slab. I initially planned to use a Mylar reflector, but all the photons got absorbed, when they touched the Mylar layer.why does that happen? I also saw another posting(posted a long time ago) related to mylar absorption.

now, I would like to use diffused reflectors, most probably TiO2. for the reflective surface, I really dont have much of an idea what values I should set for the various parameters. the ultimate aim is that as many photons as possible should come out through the opening on the left. Currently Im using Aluminum reflectors, and only around 25% of the photons escape out, while the others are absorbed. if I use TiO2, it drops to around 10%. I would like to know how to set the relevant parameters for maximum number of photons to come out of the opening. I am attaching the DetectorConstruction.cc file and a visual of the detector and the opening. Thanks in advance, Athreya

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/06/01/03.27-76314-2DetectorConstruction.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/06/01/03.26-82965-g4_03.eps

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