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Forum: Processes Involving Optical Photons
Re: Question program stops when scintillation occurs :( (Yen-Yung Chang)
Re: Feedback Re: program stops when scintillation occurs :( (Gumplinger Peter)
Date: 12 Oct, 2012
From: Yen-Yung Chang <Yen-Yung Chang>

Thank you! I attach 2 .txt file. And I write

SetProcessOrderingToLast(CerenkovPross, idxAtRest);

for Cerenkov process because exampleN06 has this line...

On Fri, 12 Oct 2012 18:51:09 GMT, Gumplinger Peter wrote:

> > I want to simulate YSO crystal scintillation using 60 keV gammas
> > shooting on it. The gamma always goes several mm into the crystal and
> > triggers photoelectric effect. Then the electron may move several
> > microns and triggers e-Ionization and scintillation.
> 
> Ok, that looks correct.
> 
>  AND THE SIMULATION STOPS...
> 
> I have no clue why that would be.
> 
> > What I'd expected is that the gamma generates
> > scintillation/optical photons on its way traveling through the crystal,
> 
> No, a gamma does not deposit energy on its way through the crystal.
> Only, once it generates a charge particle will there be a signature
> (scintillation) in your detector.
> 
> > not just AtRestDoIt
> 
> For low energy photo-electrons the AtRestDoIt of G4Scintillation is
> called.
> 
> > (and there's no optical photon afterward)
> 
> Again, don't know why.
> 
> > Have been stocked here for a week :( Oh also I can't do
> > 
> > SetProcessOrderingToLast(CerenkovPross, idxAtRest);
> 
> Who told you to do that? Please, follow the examples. What G4 version
> are we talking about?
> 
> > This gives "segmentation fault (core dumped)". I put my
> > DetectorConstruction.cc and PhysicsList.cc in the attachment.
> 
> Sorry, but I cannot open Microsoft files. What's wrong with a simple
> text file?
> 

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/10/12/19.50-25509-1DetectorConstruction.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/10/12/19.50-52527-ExN01PhysicsList.txt

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1 Disagree: Re: program stops when scintillation occurs :(   (Gumplinger Peter - 15 Oct, 2012)
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