|Message: RE: Is it possible to have periodic boundary condition?||Not Logged In (login)|
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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:email@example.com] > 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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