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Forum: Processes Involving Optical Photons
Date: 29 Mar, 2016
From: Balint Radics <Balint Radics>

Hi Peter,

Thanks a lot for the explanation!

Best,
Balint

On 30 Mar 2016 1:12 a.m., Gumplinger Peter <gum@triumf.ca> wrote:

*** Discussion title: Processes Involving Optical Photons

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.

Peter

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