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Question Geant4e error and track propagation with a parallel world volume. 

Forum: Geometry
Date: 13 Jan, 2016
From: Nicholas Kinnaird <Nicholas Kinnaird>

This is a very specific question, so I doubt anyone has answers but just in case I am asking here. It also touches on a couple of different topics, but with an emphasis on a parallel world, which is why I've added this to the Geometry section.

Here goes:

I'm doing error and track propagation analysis using the built in geant4e package for two simple geometries, almost identical. In one version, there are sensitive detectors made out of vacuum included in the physical world, and in the other version those same sensitive detectors are relegated to a parallel world. All inputs and other code is the same.

I wanted to compare the outputs for these two cases since the parallel world code loses all the auxiliary points for the visualization, and I wanted to make sure there were no other issues.

Since the sensitive detectors are made of vacuum I would expect the results to be identical, however I see track differences of up to 30 microns in some cases. This is small but still very much a concern, and leads me to question the validity of the results.

Does anyone have an idea of where I might be going wrong? Or is Geant4 just sub-optimal when utilizing parallel worlds?

I'm not going to attach any files here unless there is a specific piece of code someone might have a hunch about, since I've been very diligent in checking to make sure there are no other code differences, and from the fact that all the code seemingly works just fine except for these small inequalities I'm seeing.

Any help or thoughts would be much appreciated.

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1 Feedback: Re: Geant4e error and track propagation with a parallel world volume.   (Pedro Arce - 04 Feb, 2016)
(_ None: Re: Geant4e error and track propagation with a parallel world volume.   (Nicholas Kinnaird - 04 Feb, 2016)
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