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Question queries regarding border surfaces 

Forum: Processes Involving Optical Photons
Date: 03 Dec, 2011
From: Athreya Shankar <Athreya Shankar>

Hello all,

I am trying to incorporate WLS fibers in my scintillator.For the purpose of testing, I made my detector material out of vacuum, and simulated the passage of a single photon and visualised it. I have the following questions:

1. Following the LXe example, I covered the scintillator with a reflective coating :glisur model, polished, dielectric_metal. The coating works very well- but my doubt is whether it is valid to specify dielectric_metal here, as the scintillator and the experiment hall are both composed of vacuum? I tried using dielectric_dielectric, but it does not seem to be working (the photons just pass through the scintillator boundary).

2. I tried to model a PMT, and so I set the efficiency of the photocathode surface to 1 for a range of wavelengths. But still in the visualisation, I can see the photons getting reflected at this boundary and travelling back. Is this to be expected? I thought the photons would just get absorbed.

3. In all the trial runs, the photon(s) is directly incident on the WLS fiber's surface. But sometimes, the photon just gets absorbed by the WLS outer cladding, and does not have any further trajectory. in some other cases, it just passes through the WLS fiber. But also in quite a number of cases it gets trapped in the WLS fiber and it undergoes wavelength shifting. Why does the photon not undergo OpWLS every time?

Thanks in advance, Athreya

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1 None: Re: queries regarding border surfaces   (Davinder Siwal - 05 Dec, 2011)
(_ Question: Re: queries regarding border surfaces   (Athreya Shankar - 05 Dec, 2011)
(_ Feedback: Re: queries regarding border surfaces   (Gumplinger Peter - 05 Dec, 2011)
(_ None: Re: queries regarding border surfaces   (Athreya Shankar - 06 Dec, 2011)
(_ Feedback: Re: queries regarding border surfaces   (Gumplinger Peter - 06 Dec, 2011)
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