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Question Why does defining a primitive scorer change optical physics processes? 

Forum: Processes Involving Optical Photons
Date: 10 Feb, 2015
From: matthew <matthew>

In trying to model the scintillation and Cerenkov photons created by gamma rays in an optical fiber, I stumbled across an interesting problem.

Unbelievable but true, the optical processes in my code appear to change when a primitive scorer is defined. This does not involve recompiling the code, it does not even involved defining the quantity or particle to be scored.

Strangely, simply uncommenting line 91 in my display.txt macro file (which defines the scorer) seems to prevent all internal reflection in the optical fiber I'm modeling.

Visualization of the output with the box mesh scorer defined and not defined are attached to this message along with the display macro and the macro that defines the box mesh scorer.

Any ideas on what is causing this? If I can't use a primitive scorer, how could record the number of photons escaping from the end of the fiber? Create a new volume and make it a sensitive detector?

thanks for any advice or guidance?
matt





   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/02/10/15.56-56084-Fiber_WithMeshDefined.pdf
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/02/10/15.56-53492-er_WithOutMeshDefined.pdf
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/02/10/15.59-21808-DefineScoringMesh.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/02/10/15.59-36563-display.txt

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1 Feedback: Re: Why does defining a primitive scorer change optical physics processes?   (Gumplinger Peter - 12 Mar, 2015)
2 None: Re: Why does defining a primitive scorer change optical physics processes?   (Makoto Asai - 26 Mar, 2015)
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