Message: Re: Scintillation photons leaking through refelctive surface Not Logged In (login)
 Next-in-Thread Next-in-Thread
 Next-in-Forum Next-in-Forum

Ok Re: Scintillation photons leaking through refelctive surface 

Forum: Processes Involving Optical Photons
Re: None Scintillation photons leaking through refelctive surface (Geertje)
Re: Feedback Re: Scintillation photons leaking through refelctive surface (Gumplinger Peter)
Re: Feedback Re: Scintillation photons leaking through refelctive surface (Geertje)
Re: Feedback Re: Scintillation photons leaking through refelctive surface (Gumplinger Peter)
Date: 01 May, 2014
From: Geertje <Geertje>

Hey Peter,

so I found a solution which gets rid of the problem though I don't really understand why. I played a little with the material definitions, as this is where the scintillation is defined. Previously I defined my material of the scintillator outside of the scintillator detector construction via a private variable matGdLdPlScin. If I now define the material directly in the scintillator detector construction, those leaking scintillation photons are gone.

> 
> and then:
> 
> * G4Track Information:   Particle = opticalphoton,   Track ID = 9509,   Parent ID = 1
>     0   4.15 ns     11 um    108 um    3.7 cm   2.94 eV      0 eV      0 fm      0 fm   foil_physic    initStep
> 
> We don't have enough precision (on the 3.7cm z-coordinate) to understand
> why:
> 
> 11 um 108 um 3.7 cm
> 
> gives in one case plScin_physic and in the other foil_physic.
> 
> The easiest is probably add a G4cout in SteppingAction on the
> z-coordinate of the step with greater precision than 0.1cm.

It seems like it is exactly 37 mm.

> Yours is perhaps a geometry problem (but your geom-definition is correct
> as far as I can tell). Do you have access to the G4 source. If so, you
> can change in G4Scintillation.cc:
> 
>                 aSecondaryTrack->SetTouchableHandle(
>                                  aStep.GetPreStepPoint()->GetTouchableHandle());
> 
> to
> 
>                 aSecondaryTrack->SetTouchableHandle((G4VTouchable*)0);
> 
> What happens?
> 

Unfortunately I don't have access to the G4 source. Sorry.

Thanks again,

Geertje

Inline Depth:
 1 1
 All All
Outline Depth:
 1 1
 2 2
 All All
Add message: (add)

1 Feedback: Re: Scintillation photons leaking through refelctive surface   (Gumplinger Peter - 01 May, 2014)
(_ Question: Re: Scintillation photons leaking through refelctive surface   (Geertje - 01 May, 2014)
 Add Message Add Message
to: "Re: Scintillation photons leaking through refelctive surface"

 Subscribe Subscribe

This site runs SLAC HyperNews version 1.11-slac-98, derived from the original HyperNews