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Re: Group velocity for Cherenkov photon propagation in G3/G4 [message #11657 is a reply to message #11457] Mon, 11 April 2011 15:25 Go to previous message
Jochen Schwiening is currently offline  Jochen Schwiening
Messages: 78
Registered: June 2009
Location: GSI, Darmstadt
continuous participant
From: *gsi.de
Dear all,

just a follow-up to the still unresolved question of group
velocity for optical photons in G3/G4 in pandaroot.
I found a bug in my code where I calculated the photon energy
(a Y was swapped for a Z due to German/Intl keyboard confusion)
which caused the large scatter observed in previous plots.
When the bug is removed the points all line up nicely on a line
as can be seen in the attached plot.
The very good news is that the Geant 4 points are now pretty
much right on top of my theory line (apart from a very small
remaining scatter, probably due to some very short photon path
segments caused by the photon exiting and re-entering the bar
during each internal reflection).
The not so good news is that the Geant 3 points are still far
away from theory and G4.

Any ideas?

Cheers,
Jochen

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