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Forum: Processes Involving Optical Photons
Re: Question CsI caloriemeter, an event never ends! (Hanjin Kim)
Date: 11 Oct, 2012
From: Gumplinger Peter <Gumplinger Peter>

Hello Hanjin,

> I'm trying to simulate an CsI caloriemeter wrapped with Al layer. I've
> put some boundary properties such as REALINDEX & IMGINDEX of Al on the
> skin surface of CsI crystal and using the physic list of LXe example
> with some modification. I spent some time to figure out how to make the
> reflection take place on a boundary.

If you correctly specified a finite "IMAGINARYRINDEX" (the correct spelling is important!) then optical photons have a probability > 0 of being absorbed; e.g. you specified a theReflectifity < 1 every time they hit your Al skin surface.

> When I try to run an event, it seems all the processes work
> fine(Reflection takes place!) but photons are trapped inside the Al
> layered box and never die.

So, something is wrong with your specification of the metal surface and you get no absorption at the surface.

> I think the problem with photons that never die is caused by the fact
> that I didn't put absorption length property on CsI, but I can't find
> any information about that factor on the internet.

Well, this is, but only, part of your problem. CsI has a finite bulk absorption length (but I don't know what it is). You should be able to find it; in the old days such things were in a Physics Handbook.

> And is it possible to gather two or more physics list into one? for
> instance, QGSP_BERT + userphysicslist.

There are several ways to combine physics lists. You can use the G4PhysicsListFactory as in:

http://www-geant4.kek.jp/lxr/source/examples/extended/optical/wls/src/WLSPhysicsList.cc#L69

or go about it like in basic/B2:

http://www-geant4.kek.jp/lxr/source/examples/basic/B2/B2b/exampleB2b.cc#L68

Best regards, Peter

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1 Ok: Re: CsI caloriemeter, an event never ends!   (Hanjin Kim - 11 Oct, 2012)
(_ Feedback: Re: CsI caloriemeter, an event never ends!   (Michael H. Kelsey - 11 Oct, 2012)
1 Question: Re: CsI caloriemeter, an event never ends!   (Sahar - 28 Jan, 2018)
2 Question: Re: CsI caloriemeter, an event never ends!   (Sahar - 28 Jan, 2018)
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