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Question Peculiar problem: Overlapping Voxels in Parallel World affects particle tracks 

Forum: Biasing and Scoring
Date: 16 Jun, 2016
From: Joseph DeCunha <Joseph DeCunha>

I solved a problem that I found peculiar this morning -- and I thought that I'd let members of the community know about it, and also see if anyone has any explanation of what may have caused the problem.

I was running the same simulation in two Geant programs, one with no parallel worlds or scoring, and another in my colleague's program with a parallel world scoring class implemented.

I thought that I would look at a visualisation of the particle tracks to check that the two simulations were consistent (same GPS source, same detector geometry & random seed) but noticed that the tracks were certainly different.

Finding no reason for the discrepancy in results, I moved on to modifying other parts of the program. I noticed that the SphericalParameterisation class that creates scoring spheres in the (non-physical) scoring world, was implemented incorrectly, and had overlapping spheres. As soon as I fixed the scoring spheres the tracks from the two programs were consistent with one another again.

I'm having a hard time understanding why overlapping voxels, in a parallel world that should have no interactions with particles in the physical world would yield such results.

Has anyone experienced anything similar, or have any ideas on what caused the behaviour I experienced?

regards,

Joseph

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1 None: Re: Peculiar problem: Overlapping Voxels in Parallel World affects particle tracks   (Makoto Asai - 28 Jun, 2016)
(_ None: Re: Peculiar problem: Overlapping Voxels in Parallel World affects particle tracks   (Joseph DeCunha - 28 Jun, 2016)
(_ None: Re: Peculiar problem: Overlapping Voxels in Parallel World affects particle tracks   (Makoto Asai - 28 Jun, 2016)
(_ Question: Re: Peculiar problem: Overlapping Voxels in Parallel World affects particle tracks   (Juliana Cristina Martins - 05 Feb, 2018)
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