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Re: Group velocity for Cherenkov photon propagation in G3/G4 [message #11475 is a reply to message #11457] Fri, 28 January 2011 19:14 Go to previous messageGo to previous message
Jochen Schwiening is currently offline  Jochen Schwiening
Messages: 84
Registered: June 2009
Location: GSI, Darmstadt
continuous participant
From: *gsi.de
Hi Oliver,

thanks for the check.
Are you plotting the average velocity per wavelength bin or the
velocity for each photon? In the events that I looked at the
velocity is almost correct on average but there is a huge spread.
Would it be possible for you to plot the velocity per photon
vs. the photon wavelength from your sample, similar to the
scatter plots I have?
I checked the material properties table for FusedSil in the
current official media_pnd.geo and it looks OK. The binning
could be finer and I applied a table with the equivalent of
the 1nm binning you recommended. The spread of v_group for a
given wavelength remains the same, as you can see in the
attached plot for the finely binned FusedSil.

Cheers,
Jochen

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