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Forum: Processes Involving Optical Photons
Re: Question Discrepancy in the number of optical photons produced by low energy charged particles in scintillator (John McFee)
Re: Feedback Re: Discrepancy in the number of optical photons produced by low energy charged particles in scintillator (Gumplinger Peter)
Date: 14 Apr, 2017
From: John McFee <John McFee>

Hi Peter,

Thank you for your answer.

> Birk's correction via fEmSaturation and specifying scintillation by particle > type are physically mutually exclusive!

I missed that. I should have looked at the G4Scintillation.cc code.

> Also, you'd need to add:
>
> G4EmSaturation* emSaturation = G4LossTableManager::Instance()->EmSaturation();
>
>fScintillationProcessProton->AddSaturation(emSaturation);
>
>in your PhysicsList.

I did have that in my code. I just did not show it in the code snippet I posted. I commented out my code related to EmSaturation and re-ran it. It did not change the results (as I suspected).

>Why do you have:
>
>fScintillationProcessProton->SetScintillationExcitationRatio(0.80);
>
>Do you have defined a fast and a slow scintillation component?

Yes, I have fast and slow scintillation components for my scintillator.The ratio is different for each particle I am considering (electron, proton, alpha, carbon).

>I don't know why you are only seeing 20% of the yield. You can debug this by looking at what happens in the G4Scintillation code fragment shown above and in the code of GetScintillationYieldByParticleType routine. (I assume you have access to the G4 code).

>Perhaps, modify your user code and use G4OpticalPhysics instead to define the >G4ScintillationProcess (only one process, not one process for each particle >type).
>
>Peter 

I will try your suggestions to see what I can find.

Again, thanks

John

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