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Forum: Event and Track Management
Re: Question How can a track be killed with all it's secondaries at a particular point?
Date: 17 Aug, 2005
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Tue, 16 Aug 2005 maryam@jlab.org wrote:

> *** Discussion title: Event and Track Management
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/eventtrackmanage/369"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Dear Geant4 fans and experts,
> 
> Can a track be totally removed by using: 
>  track->SetTrackStatus(fStopAndKill);
> 
> It seems that way according to Geant4 advance example of underground, but 
> in my case it does not work as it should. I'm looking at a particular z 
> position range of tracks in the SteppingAction:
>  if((track->GetPosition().z()>7188.2)&&(track->GetPosition().z()<7239.))
> 
> Then, if at that range the track is in a particular volume then I keep
> it, otherwise I need to kill it with all it's secondaries so no sign of
> it reaches the sensitive detector. This should be done for our
> background studies. Surprizingly I get more electrons in the detector
> than without having some of them killed! So there is certainly a
> problem.
> 
> I also tried: 
>  track->SetTrackStatus(fKillTrackAndSecondaries); 
> 
> But that gave me even more hits than the previous one.
> 
> Can anyone show me the correct way to do this? Is there another way to
> have the tracks stoped?
> 
> Thanks a lot in advance,
> 
> Best regards,
> 
> Maryam
> 

Hello,

Normally, in the UserSteppingAction the user access to const G4Track 
pointer. This means impossible to change any G4Track member. 

The optimal way to change track status is to create you own Physical 
process, which will control where your tracks and will propose to change 
the status of the track.

The example of this process is StepMax class in 
examples/extended/electromagnetic/TestEm3, 7, 9 ...

VI 

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