| Energy loss in EMC: bug solved [message #6781] |
Tue, 27 May 2008 11:33 |
StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino
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first-grade participant |
From: *physik.uni-giessen.de
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Dear all,
Ivana has corrected the bug that was present in geant4_vmc with the option "specialCuts":
The cut was applied by mistake also to e+, and due to this, the e+ did not annihilated and so we did not recuperate the energy released in annihilation.
I did some studies with the 5x5 EMC test setup, using the r341 of VirtualMC, and this is the energy deposited for 1000 photons at 1 GeV:
In terms of CPU time, to run 1000 photons at 1GeV:
geant3: 45 s
geant4 all: 274 s
geant4 cuts: 151 s
File size:
g3: 57 M
g4 all: 289 M
g4 cuts: 137 M
So, now it seems ok from this side(even if I have to think a bit about the file size-> number of mc points). However further studies should be run in the next future, and with the full geometry.
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Attachment: newcomp.gif
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