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Question Does AIDA affect a Geant4 simulation? 

Keywords: AIDA
Forum: Analysis
Date: 27 Mar, 2006
From: David Shipley <David Shipley>


Can anyone tell me if the use of AIDA (via the G4ANALYSIS_USE option)
affects the results/output of a Geant4 simulation?

The reason I ask this question is that when I run the A01 extended
example with a given number of events, the output is 
different when AIDA is used (G4ANALYSIS_USE = 1) and when not used 
(G4ANALYSIS_USE = 0) even though the same initial random number seed
is used in both cases. This is similarly true with the
Hadrontherapy example (after changing it so that the data is dumped out
when AIDA is not used). I have yet to check if the difference in the
outputs are statisically significant.

I had the impression that the use of AIDA should not have any
effect on the simulation at all (unless it generates it's own
random numbers, of course) and would expect the output/transport to be
identical if the same seeds are used. Is this a reasonable assumption?

I am using Geant4.8.0.p01 with AIDAJNI-3.2.3 & JAIDA-3.2.4 installed
under Mandrake Linux 9.1.

Thanks in advance.


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