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Question no interaction at a boundary 

Forum: Processes Involving Optical Photons
Date: 07 Feb, 2010
From: Akira Okumura <Akira Okumura>

Hello,

I am currently learning how to use G4 optical and GDML files in my simulation. In my test program, I found a strange photon behavior as shown in the attached images.

The images are both the same event seen from different angles. As noted in the first image, a photon is reflected at a boundary between BGO block and the air. However, it isn't reflected nor refracted at the second interaction point. In this example, I set the refractive index of the BGO block to n=10000 so that all photons are reflected by total internal reflection.

You can get the source code from here.

http://www-utheal.phys.s.u-tokyo.ac.jp/~oxon/tmp/MinimumTest.tgz

$ tar zxvf MinimumTest.tgz $ cd MinimumTest $ make $ ./work/bin/Darwin-g++/MinimumTest3 /control/execute vis.mac /control/execute setupMT3.mac /run/beamOn

I do not see this behavior when I run MinimumTest1 in the tgz. Therefore this may be due to my mistake in the code. Would anyone kindly check the code and tell me the mistake, please?

Akira

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2010/02/07/06.15-44167-view1.png
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2010/02/07/06.15-74732-view2.png

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1 Warning: Re: no interaction at a boundary   (Gumplinger Peter - 08 Feb, 2010)
(_ None: Re: no interaction at a boundary   (Akira Okumura - 08 Feb, 2010)
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