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Question Problems in the number of Cerenkov optical photons. 

Forum: Particles
Date: 30 Nov, 2005
From: Andreas Battaglia <andreas.battaglia@roma1.infn.it>

Hallo,
Iíve a problem in the number of  optical photons produced by Cerenkov process.
Iím trying to simulate a polystyrene scintillator wrapped with tyvek and with
WLS double cladding fibers in it. In my Detector Construction I had to define
some spectra: the materialsí refractive indexes, their absorption length, the
scintillator scintillation probability and the WLS absorption length and
emission probability.
Now, if the various spectra have different energy ranges, I get many warnings of
the type:
Warning: G4MaterialPropertyVector::GetProperty ==> attempt to Retrieve Property above range 
Warning: G4MaterialPropertyVector::GetProperty ==> attempt to Retrieve Property below range 


So I had to match the energy ranges each other and the warnings disappear.
In doing that Iíve taken care of adjusting the properties in a correct way: for
example I asked the scintillation probability out of the original energy range
to be 0.
Now my problem is: if I enlarge the energy range in which a material refractive
index is defined, the number of optical photons produced by Cerenkov process
increases.
So: an operation I only do to avoid the warnings leads me to a different
physical situation!!
Note that I kept the material refractive indexes constant in the energy range.

Thanks a lot in advantage.
Andreas Battaglia

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1 Feedback: Re: Problems in the number of Cerenkov optical photons.   (Peter Gumplinger - 30 Nov, 2005)
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