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Forum: Processes Involving Optical Photons
Re: Question Scintillators array
Date: 02 Jul, 2014
From: Gumplinger Peter <Gumplinger Peter>

> I would like to construct an array of scintillators.

> What would be an efficient way to define a 4x8 array of this simple
> setup -> 32 scintillators side-by-side with one photodetector at the end
> of each scintillator ?

All you got to do is repeat your current geometry in 4x8 locations. You do this by 'housing' your current geometry in an envelope just large enough to hold the scintillator and its photodetector.

> Then, if a gamma produce optical light in a certain scintillator, I
> would like to be able to track optical photons that cross to adjacent
> scintillators (depending on the surfaces, there will be a lot of light
> detected by the "good" photodetector - the one attached to the primary
> excited scintillator - and less light detected by photodetectors
> attached to adjacent scintillators).

From your explanation is seems that the scintillators in the array are in optical contact with each other. If you want to assume that they are perfectly coupled then you don't have to do anything. The program will just propagate tracks from one scintillator to the next undeflected and undiminished. If you however want to introduce some losses, or assume more realistically an air gap in between, you need to define this air gap by increasing the air envelope volume just a little.

I am afraid, it is not possible to define a G4LogicalBorderSurface between adjecent scintillators because the code short-cuts for dielectric_dielectric if it finds the same material on both sides of a volume boundary.

A close examination of the LXe example (the WLS array geometry definition code - LXeWLSFiber and LXeWLSSlab) should help although there, the individual fibers are optically isolated.

Peter

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1 None: Re: Scintillators array   (Cab - 03 Jul, 2014)
(_ Feedback: Re: Scintillators array   (Gumplinger Peter - 03 Jul, 2014)
(_ None: Re: Scintillators array   (Cab - 09 Jul, 2014)
(_ Feedback: Re: Scintillators array   (Gumplinger Peter - 09 Jul, 2014)
(_ None: Re: Scintillators array   (Cab - 11 Jul, 2014)
(_ More: Re: Scintillators array   (Gumplinger Peter - 11 Jul, 2014)
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