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Re: Stepsize in TPC Simulation with new external packages [message #5546 is a reply to message #5540]

Mon, 03 December 2007 14:28

Mohammad Al-Turany
Messages: 518
Registered: April 2004
Location: GSI, Germany

first-grade participant

From: *gsi.de

Hallo,

I just make the comparison for dedx in the TPC, and what I see also a problem but a little bit deferent than yours! first I compared G3 with and without step limitation and the results where exactly the same. (see attached histograms ) To do this I modified the PndTpcDetector.cc so that
1. Sum the energy loss over all steps inside the TPC for each track
2. take the track length at the first step (Entering) and the track length at exiting, and put the difference in the TPCPoint.
3. select on one type of particles

index.php?t=getfile&id=3994&private=0

without step limit (remove AUTONULL and extra parameters from media file)

. index.php?t=getfile&id=3998&private=0

and this one with the limits!

So it is the same as expected. Now if I compare with the wonderful state of the art most advanced Monte Carlo engine I have the following plots for:

index.php?t=getfile&id=3995&private=0

with step limitation. And the next one without step limitation (remove the StepLimiter from g4Config.C):

index.php?t=getfile&id=3999&private=0

now comparing G4 results with and without step limitation:

index.php?t=getfile&id=4000&private=0

and this is not the whole story, if you compare with mu (5000 mu, 0.5 GeV) only G4 with and without step limitation you will see:

index.php?t=getfile&id=4001&private=0

So from all this I would say the shape of dedx is ok, but we have to understand the difference between G3 and G4 and the inconsistence behavior of G4!!

Attachment: dedx_nolimit_g3.gif
(Size: 9.86KB, Downloaded 1358 times)
Attachment: dedx_limit_g4.gif
(Size: 10.45KB, Downloaded 1368 times)
Attachment: dedx_limit_g3.gif
(Size: 9.92KB, Downloaded 1346 times)
Attachment: dedx_nolimit_g4.gif
(Size: 9.81KB, Downloaded 1416 times)
Attachment: g4pi.gif
(Size: 11.02KB, Downloaded 1402 times)
Attachment: g4mu.gif
(Size: 10.20KB, Downloaded 1300 times)

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[Message index]

		Stepsize in TPC Simulation with new external packages By: Sebastian Neubert on Tue, 27 November 2007 15:40
		Re: Stepsize in TPC Simulation with new external packages By: Mohammad Al-Turany on Tue, 27 November 2007 16:45
		Re: Stepsize in TPC Simulation with new external packages By: Mohammad Al-Turany on Tue, 27 November 2007 20:27
		Re: Stepsize in TPC Simulation with new external packages By: Sebastian Neubert on Tue, 27 November 2007 23:50
		Re: Stepsize in TPC Simulation with new external packages By: Sebastian Neubert on Wed, 28 November 2007 11:35
		Re: Stepsize in TPC Simulation with new external packages By: Sebastian Neubert on Wed, 28 November 2007 13:30
		Re: Stepsize in TPC Simulation with new external packages By: Sebastian Neubert on Wed, 28 November 2007 15:53
		Re: Stepsize in TPC Simulation with new external packages By: Mohammad Al-Turany on Wed, 28 November 2007 17:53
		Re: Stepsize in TPC Simulation with new external packages By: Sebastian Neubert on Wed, 28 November 2007 20:07
		Re: Stepsize in TPC Simulation with new external packages By: Sebastian Neubert on Thu, 29 November 2007 18:58
		Re: Stepsize in TPC Simulation with new external packages By: Viola Michael on Fri, 30 November 2007 17:17
		Re: Stepsize in TPC Simulation with new external packages By: Mohammad Al-Turany on Mon, 03 December 2007 14:28
		Re: Stepsize in TPC Simulation with new external packages By: Mohammad Al-Turany on Mon, 03 December 2007 16:49
		Re: Stepsize in TPC Simulation with new external packages By: Sebastian Neubert on Thu, 13 December 2007 15:11
		Re: Stepsize in TPC Simulation with new external packages By: Mohammad Al-Turany on Thu, 13 December 2007 15:30
		Re: Stepsize in TPC Simulation with new external packages By: Viola Michael on Thu, 13 December 2007 15:45
		Re: Stepsize in TPC Simulation with new external packages By: Mohammad Al-Turany on Fri, 14 December 2007 08:47
		Re: Stepsize in TPC Simulation with new external packages By: Viola Michael on Fri, 14 December 2007 12:57

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