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Forum: Geometry
Re: Question /gun/position (Reema)
Date: 15 Oct, 2007
From: John Apostolakis <John Apostolakis>

Dear Reema, 

Likely since you report that the same effect occurs when you hard-code
the position, it has nothing to do with this, but only with your
geometry and sensitive volumes.

More likely is that you do not adjust the direction of your particles,
to point them at your detector.  

After you say 
/gun/position -46.5 0.0 15.0 mm

Try:
/gun/?direction 
/gun/direction 0 0 -1 

In case this does not help, could you please explain a bit more about
what your setup is like, and whether you based your program on an
existing example. In particular:
  - are there many other volumes in your setup that could absorb your
tracks?
  - the PrimaryGenerator: did you create your own or choose one from an
example?

Hope these suggestions help.

Best regards,
John Apostolakis

P.S. Could you let us know the application area of your project. 
------------------------------------------------------------------------
John Apostolakis                   Email:  John.Apostolakis@cern.ch
  

> -----Original Message-----
> From: reema.bhagtani@marquette.edu 
> [mailto:reema.bhagtani@marquette.edu] 
> Sent: Monday, October 15, 2007 5:13 PM
> To: PublicHyperNews@slac.stanford.edu
> Subject: /gun/position 
> 
> *** Discussion title: Geometry
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/geometry/797"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Hi all,
> 
> I am working to create an application with source position at
> (-46.5,0,15) cm and the detector at (31.5,0,0). The detector 
> dimensions are 0.15X40X30 cm.
> 
> I am using the UI command /gun/position to set the source 
> position. When I place the source at (-46.5,0,0), I get the 
> desired output on the detector. However when I move the 
> source to (-46.5,0,15), there is no output at the detector. 
> When I move the source to (-46.5,0,-15), it works fine. I 
> also tried to hardcode the gun position in the 
> PrimaryGeneratorAction. I see the same effects.
> 
> Does anyone have any suggestions as to what might be 
> happening or some mistake that I might be making when setting 
> this geometry? Any help is much appreciated. Thanks in 
> advance! Best regards, Reema
> 

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