GSI Forum: Monte Carlo Engines » Group velocity for Cherenkov photon propagation in G3/G4

Home » PANDA » PandaRoot » Monte Carlo Engines » Group velocity for Cherenkov photon propagation in G3/G4

Show: Today's Messages :: Polls :: Message Navigator

Re: Group velocity for Cherenkov photon propagation in G3/G4 [message #11657 is a reply to message #11457]

Mon, 11 April 2011 15:25

Jochen Schwiening
Messages: 86
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

index.php?t=getfile&id=6383&private=0

Attachment: group_velo_geant_vmc_apr_2011.png
(Size: 46.68KB, Downloaded 1540 times)

Report message to a moderator

[Message index]

		Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Wed, 26 January 2011 11:46
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: StefanoSpataro on Wed, 26 January 2011 12:41
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Wed, 26 January 2011 14:12
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: StefanoSpataro on Wed, 26 January 2011 14:37
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Mohammad Al-Turany on Wed, 26 January 2011 14:53
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Wed, 26 January 2011 17:41
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Thu, 27 January 2011 11:33
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Oliver Merle on Fri, 28 January 2011 19:04
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Mohammad Al-Turany on Wed, 26 January 2011 21:23
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Fri, 28 January 2011 19:14
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Oliver Merle on Fri, 28 January 2011 19:39
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Fri, 28 January 2011 21:33
		Re: Group velocity for Cherenkov photon propagation in G3/G4 By: Jochen Schwiening on Mon, 11 April 2011 15:25

Previous Topic:	future of GEANT
Next Topic:	[Solved]Problem with PndEvtGenDirect

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Tue May 26 15:50:48 CEST 2026

Total time taken to generate the page: 0.00741 seconds