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Forum: Processes Involving Optical Photons
Re: Question Cherenkov photons and reflections
Date: 14 May, 2013
From: Gumplinger Peter <Gumplinger Peter>

Hello Baptiste,

> My problem here is that I can't run this simulation with n=1.473. To
> produce the plots attached, I had to set n=1.2 . Doing so, the
> simulation for one single event (one thrown pion), takes about 13
> seconds to run... If I set n=1.473, the simulation never ends.

The simulation time should roughly scale with the number of produced photons, except you may have some photons trapped such that they never 'hit' your photo sensor. In that case, make sure that you have a realistic reflectivity (<1) and a finite bulk absorption.

> I think the problem is coming from the fact that for n=1.2, only a small
> part of the photons are reflected and trapped inside the QUARTZ bar,
> while for n=1.473, almost all the photons are trapped and transported to
> the ends of the bars. That means a large amount of reflections and
> computations.

You can discard any fraction of the produced photons in your UserStackingAction::ClassifyNewTrack by throwing a random number, setting:

classification = fKill;

You will then scale your result by 1/fraction.

Hope this helps, Peter

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1 Question: Re: Cherenkov photons and reflections   (bg92 - 16 May, 2013)
(_ Feedback: Re: Cherenkov photons and reflections   (Gumplinger Peter - 16 May, 2013)
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