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Re: Group velocity for Cherenkov photon propagation in G3/G4 [message #11474 is a reply to message #11465] Fri, 28 January 2011 19:04 Go to previous messageGo to previous message
Oliver Merle is currently offline  Oliver Merle
Messages: 13
Registered: December 2010
occasional visitor
From: *wlan.uni-giessen.de
I checked the group velocity upstream in Geant4 and everything seems to be correct.

Method:
Create photons of different wavelength in a fused silica radiator (manually, not via the Cherenkov process). Export velocity of G4OpticalPhotons and a computed group velocity (using an approximation of n_g = n_p - lambda* dn/dlambda)

Result:
Attached


If a bug exists, it is most likely related to wrong material property maps.

Oliver
 
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