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Forum: Geometry
Re: None Is it possible to have periodic boundary condition? (Luk Wing Hong, Antony)
Date: 22 Jul, 2007
From: John Apostolakis <John Apostolakis>

If you wanted to impose periodic boundary conditions, you would have to
do this yourself.  It is neither particularly difficult nor very easy,
and it can be done this way: write a process that takes a particle that
arrives at the relevant boundary (not the world boundary - as it is
killed there) and reflects it or else transports it to other end.  

To see how to create a process that deals with boundaries, please check
the optical processes.

Yet this seems a lot of work.  It is not clear to me why having a large
piece of rock is inefficient.  After all, only processes which occur
will limit the step. 

Best regards,
John Apostolakis
------------------------------------------------------------------------
John Apostolakis                   Email:  John.Apostolakis@cern.ch
  

> -----Original Message-----
> From: Luk Wing Hong, Antony [mailto:antonyluk@cuhk.edu.hk] 
> Sent: Friday, July 20, 2007 9:07 PM
> To: PublicHyperNews@slac.stanford.edu
> Subject: Is it possible to have periodic boundary condition?
> 
> *** Discussion title: Geometry
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/geometry/765"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> I wonder if it is possible to make a periodic boundary 
> condition for particles pass through a volume.
> 
> I am doing muon induced neutron underground. I have to 
> generate muon on top of ground and let it propagates through 
> rock. However, I need to use very large piece of rock in 
> order to account for the effects of very low incidence angle 
> of muon. It is very inefficient. However, if there is 
> periodic boundary condition, then I can simulates using a 
> much smaller piece of rock.
> 
> Thanks,
> 
> Antony Luk
> 

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