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Forum: Processes Involving Optical Photons
Re: Question multiple optical photon bouncing (Balint Radics)
Date: 29 Mar, 2016
From: Gumplinger Peter <Gumplinger Peter>

Hi Balint,

> We find that in many cases the optical photon is bouncing a lot (see

> below) between the thin surface boundaries before either getting back to

> the large liquid argon volume

It seems to me that this photon reflect off WLSSupport then goes through 0.135mm in WLS and then goes 159mm through LArCol before hitting another WLS. The photons are not bouncing inside WLS (thin surface boundaries).

> Which optical surface parameter could enhance this effect so much?

The mirrow (WLSSupport) may not be perfect and has a finite reflectivity. There is also a finite absorption length in LAr.

The track you show reflects at WLSSupport and refracts either in or out of WLS from LAr or to LAr.

I see nothing surprising.


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