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Forum: Processes Involving Optical Photons
Re: Question Cerenkov photons "stuck" in parameterised geometry using v9.6p02 (Sam Blake)
Date: 23 Jul, 2013
From: Gumplinger Peter <Gumplinger Peter>

Hi Sam,

> such that the stepping manager seems to get
> stuck in an infinite loop, trying to move the photon but not actually
> being able to.

Can you please post the first few lines of the stepping information when the track gets stuck and also turn on G4OpBoundaryProcess verbose for this.

> Interestingly, this only appears to be happening for optical photons
> created by Cerenkov events. By de-activating the Cerenkov process and
> only using scintillation to generate optical photons, this error
> disappears. I have recently upgraded from version 9.4p01 and am now
> (finally) using version 9.6p02.

I cannot imagine that your navigation problem has anything to do with the optical photon production. It happens only Cerenkov photons in your simulation sample the geometry in a way that this problem occurs.

I see nothing wrong with how you initialize the processes etc.

> My scintillator geometry was previously a simple G4box slab, and this
> problem never occurred. However, I have now changed the scintillator to
> a pixelated design by creating a parameterised volume of G4boxes. I am
> therefore suspicious that part of the problem may be related to this
> parameterised geometry,

Please, post your lines of code that have to do with the pixelated/parameterised geometry definition and how (if at all) you associate surfaces.


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1 None: Re: Cerenkov photons   (Sam Blake - 24 Jul, 2013)
(_ Idea: Re: Cerenkov photons   (Gumplinger Peter - 24 Jul, 2013)
(_ None: Re: Cerenkov photons   (Sam Blake - 25 Jul, 2013)
(_ Ok: Re: Cerenkov photons   (Sam Blake - 05 Aug, 2013)
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