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Forum: Fields: Magnetic and Otherwise
Re: Question Problems with Tracking in Vacuum (Jens Hasper)
Date: 28 Mar, 2006
From: John Apostolakis <John Apostolakis>

Subject: Re: Problems with Tracking in Vacuum

Dear Jens,

I am unclear whether you are interested to visualise the tracks or you 
are having a problem with a physical observable, boundary crossing or 
something else. You also do not specify what typical value of field you 
have and the average momentum.  Could you let us know these and the 
direction of the momentum with respect to the field ? 

I note that you need to set the user limits to all volume in which you 
want to see (visualise) nice tracks.  One possibility is to set the user 
limits to the Region of the detector (potentially the global region) if 
you want it to apply to many volumes at the same time. Also a smaller 
value for the  could be needed depending on the radius of curvature of 
the tracks. In case the pictures are a concern, I note that the 
visualisation is currently approximate.

We can try to provide further assistance, if you could let us know a bit 
more about the difficulty you are experiencing.

Regards,
John Apostolakis

Jens Hasper wrote:

>*** Discussion title: Fields: Magnetic and Otherwise
>Email replies to PublicHyperNews@slac.stanford.edu must include:
>  In-Reply-To: <"/emfields/98"@geant4-hn.slac.stanford.edu>
>  Subject: ...change this to be about your reply.
>
>Hi, I'm using a magnetic field inside a vacuum box and having problems
>to get proper particle tracks. I've already tried to set the UserLimits
>with the methods below, which has already been suggested in several
>threads:
>
>G4UserLimits* userLimits=new G4UserLimits(1.*mm);
>expHall_log->SetUserLimits(userLimits);
>
>However, this didn't improve the simulation at all. The tracks look
>better when using Air instead of Vacuum (I guess because the
>TrackingCuts are different). Am I doing something wrong with the
>assignment of the UserLimits or do you have any suggestion what else to
>do?
>
>Thanks a lot,
>
>Jens
>  
>

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1 None: Re: Problems with Tracking in Vacuum   (Jens Hasper - 28 Mar, 2006)
(_ None: Re: Problems with Tracking in Vacuum   (Makoto Asai - 28 Mar, 2006)
(_ None: Re: Problems with Tracking in Vacuum   (Jens Hasper - 28 Mar, 2006)
(_ None: Re: Problems with Tracking in Vacuum   (Anton - 25 May, 2006)
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