GSI Forum
GSI Helmholtzzentrum für Schwerionenforschung

Home » PANDA » PandaRoot » EMC » Geant 3, Geant 4 VMC, native geant 4 comparison
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
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: pwo25 test application in emc directory
Next Topic: Code for APD
Goto Forum:
  


Current Time: Sat Nov 02 23:07:55 CET 2024

Total time taken to generate the page: 0.00667 seconds