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Forum: Fast Simulation, Transportation & Others
Re: Question Weird bug - energy deposit from transportation plus OutOfWorld when really well inside it. (Colin)
Date: 27 Apr, 2004
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Tue, 27 Apr 2004, Colin wrote:

> *** Discussion title: Fast Simulation, Transportation & Others
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/fastsim/5"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Hi,
> 
> I am simulating a simple geometry - the experimentalHall is just air 
> and is 4m cubed, inside this is a sand pit 120*120*30cm. I am starting
> 1461 keV photons at the centre of the sand pit and emitting them 
> isotropically.
> 
> My simulation crashes and the last thing the log file tells me is:
> 
> *********************************************************************************************************
> * G4Track Information:   Particle = e-,   Track ID = 3,   Parent ID = 1
> *********************************************************************************************************
> 
> Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
>     0      452     -599    -11.6     0.998        0        0         0    pit_phys initStep
>     1      451     -600    -10.9     0.585    0.413     1.68      1.68     expHall Transportation
>     2      451     -600    -10.9     0.585        0        0      1.68  OutOfWorld eBrem
> 
> 3 things puzzle me about this log:
> 
> 1) The final step is listed as OutOfWorld, when the position of the 
> point (451,-600,-10.9) is very much within my world.
> 
> 2) In the second step (#1) the transportation process is listed along 
> side an energy deposit - is this supposed to happen? I thought by 
> definition transportation didnt deposit any energy.
> 
> 3) The final step has the process eBrem listed (not transportation) and 
> has no energy deposit listed.
> 
> Can anyone shed any light on what has gone wrong here or am misunderstanding the log file?
> 
> Cheers,
> 
> Colin
> 
> 

Hi,

Something is wrong. What G4 release is used?

In any case I would suggest to take 
example/extended/electromagnetic/TestEm3 define your material as Air, take 
your proton, and reproduce your problem.

VI 

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