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Geant 3, Geant 4 VMC, native geant 4 comparison [message #5940] Fri, 22 February 2008 12:20 Go to previous message
Dima Melnychuk is currently offline  Dima Melnychuk
Messages: 213
Registered: April 2004
Location: National Centre for Nucle...
first-grade participant
From: *fuw.edu.pl
Hi again,

I put here a couple of plots that demonstrate difference in deposited energy for Geant3, Geant4 VMC and native Geant4.

So cluster_energy_full.jpg - index.php?t=getfile&id=4193&private=0

is energy deposited from 1GeV photon in emc barrel (theta=50, phi=0-360).

And it is comparable with energy deposited in EmcTest setup (5x5 PbWO4 crystals), implemented by Stefano.
index.php?t=getfile&id=4194&private=0

So around 5% of energy is lost somewhere for Geant4 and it doesn't come from complicated emc geometry.

But with native Geant4 application
index.php?t=getfile&id=4195&private=0

deposited energy is similar to Geant3 VMC and close to the value calculated by Jan in Babar framework for the whole EMC.
http://tau.ep1.rub.de/HyperNews/get/SimGenDisc/2159/1/1/1/1/1.html

So the difference doesn't come from the different Geant4 version
4.7 in Babar framework vs. 4.9 in pandaroot (which I also used in native Geant4 application).

So the source of difference is still under investigation,

Dima
 
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