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Forum: Physics List
Re: None msc model for positrons (Simone)
Re: Idea Re: msc model for positrons (Vladimir Ivanchenko)
Date: 06 Oct, 2015
From: Simone <Simone>

I run a geometry test and found an overlapping in 2 logical mother volumes (see the figure attached, I found difficoult to explain the geometry otherwise). This was because the 2 sets of daughter volumes had different materials, thicknesses etc., and I did not want to parameterize everything.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/10/06/10.08-631-BEFORE.png

Now I have revised the code, and both the sets are parameterized inside the same mother volume (geometry test does not detect any overlap ofc). A check on the daughter geometry seems fine in terms of positioning, materials and sizes (see attached files).

   Attachment:
            http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/10/06/10.23-88003-now1.png
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/10/06/10.23-43477-now1-zoom.png
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/10/06/10.23-54363-now2.png

However, whenever a particle enters these parameterized volumes the simulation crashes with a segmentation fault. This is the output of tracking/verbose 6 (you can find attached the complete output for this last track):

#Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
   14     1.34     -9.4      328      0.57        0     43.8       536      Filter Transportation

 >>DefinePhysicalStepLength (List of proposed StepLengths): 
    ++ProposedStep(PostStep ) = 1.797693134862316e+308 : ProcName = photonNuclear (No ForceCondition)
Segmentation fault (core dump created)

       Attachment:

  http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/10/06/10.28-62176-lasttrack.dat

I tried modifying/removing the step limiter, the sizes and the material for these volumes, but nothing changed. I really have no clue of what is going on or how to solve this.

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1 Idea: Re: msc model for positrons   (Vladimir Ivanchenko - 06 Oct, 2015)
(_ None: Re: msc model for positrons   (Simone - 07 Oct, 2015)
(_ More: Re: msc model for positrons   (Simone - 07 Oct, 2015)
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