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Forum: Processes Involving Optical Photons
Re: Question Scintillators array
Re: Feedback Re: Scintillators array (Gumplinger Peter)
Re: None Re: Scintillators array
Re: Feedback Re: Scintillators array (Gumplinger Peter)
Re: None Re: Scintillators array
Date: 09 Jul, 2014
From: Gumplinger Peter <Gumplinger Peter>

On Wed, 09 Jul 2014 14:13:08 GMT, Cab wrote:
> Thank you Peter, I think it is now more clear. However, when defining my
> enveloppe, I think there will be something wrong for the lateral
> surfaces. Let's say I have this 1D setup
> 
>  ... Crystal1 | Reflector | Glue | Cystal2 | Glue | Reflector | Glue | Crystal3 ...

You are using "groundteflonair" which if I remember correctly is a surface where the crystal is wrapped with teflon and has a small air gap. You'll define this to be the surface of all sides of one of your crystals except the one side with the read-out. Optically, the glue that binds the crystals together is irrelevant.

> How can I define my enveloppe properly with this?

The 'envelope' is as wide in lateral dimensions as the crystal. In lenght - the direction to which you have the read-out - the envelope is as long as the crystal + readout/detector-volume. You place envelopes in the array next to each other without space.

> Because the crystals
> are wrapped with reflectors (I will probably use one of the
> RealSurface1.0 LUT) and these reflectors are not really volumes as they
> don't have a thickness, there's the problem of having the same material
> on both sides of the G4LogicalBorderSurface.

As I already said, do not worry about 'same material' on both sides when your surface is not dielectric_dielectric or has a G4OpticalSurface. You are using dielectric_LUT and you are using a G4OpticalSurface.

I attach code - a modified OpNovice example - that was provided to me by Martin Janecek from Rapiscan Laboratories as a guide.

Peter

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/07/09/11.37-72722-torConstruction.cc_Martin

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1 None: Re: Scintillators array   (Cab - 11 Jul, 2014)
(_ More: Re: Scintillators array   (Gumplinger Peter - 11 Jul, 2014)
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