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Keywords: photons cherenkov energy range distribution rindex
Forum: Processes Involving Optical Photons
Date: 01 Sep, 2004
From: Gumplinger Peter <Gumplinger Peter>

Please, refer to

http://wwwasd.web.cern.ch/wwwasd/geant4/G4UsersDocuments/UsersGuides/PhysicsReferenceManual/html/node18.html#SECTION012020000000000000000

in the Geant4 Physics Reference Manual and/or

J.D.Jackson, Classical Electrodynamics, John Wiley and Sons (1998)

The number of Cerenkov photons generated per unit step length is adjusted to the energy range in which the index of refraction is specified.

The spectral range of these Cerenkov photons is truncated to the energy range in which the Rindex is specified. However, the spectral shape in that truncated range is the same as it would be for a wider range.

To answer your questions:

Will we get correct number-of-photons/step and energy distributions (for the Emin-Emax range), or will these two will be incorrect?

You should get the correct number-of-photons/step and the correct energy distribution.

If you were to make a normalized plot of the Cerenkov energy spectrum that you get from the DoIt of G4Cerenkov, normalized in each case to the number of photons in your restricted energy range, the plots should be identical for both the more restricted and less restricted situation. To think of it, the two plots should already roughly have the same number of entries in it from Emin to Emax.

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