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Question Track stuck warnings, only when using primitive scoring 

Forum: Event and Track Management
Date: 09 Jun, 2010
From: Andre Sailer <Andre Sailer>

Hello,

I noticed a very odd behavior.

My Geometry is now basically long tubes of iron, filled with low density gas to represent a vacuum(i.e. beampipes) and a magnetic field map from -7 to plus 7 meters in Z and a few meters in radius as well. (I removed all the other detector parts.)

Now when I turn on a scoring volume like this:

/score/create/boxMesh boxMesh_1
/score/mesh/boxSize 10 10 0.1 cm
/score/mesh/nBin 10 10 1
/score/mesh/translate/xyz 0 0 100 cm
/score/quantity/passageCellCurrent passcellcur
/score/close

I get warnings like the following.
WARNING - G4Navigator::ComputeStep()
          Track stuck, not moving for 10 steps
          in volume -tube_BeamCalInnerDnstream1- at point (3.629185133,2.42492601,3353.139749)
          direction: (0.07986325831,0.9463373312,0.3131573336).
          Potential geometry or navigation problem !
          Trying pushing it of 9e-10 mm ...

The odd thing is, that these warning do not appear, if I don't create the scoring mesh. As far as I can tell, the scoring mesh is also far away from the geometry where the track is stuck. So I can not explain, why this should appear only if I declare the scoring mesh.

In both cases I use
Geant4 9.3 patch 1
the QGSP_BERT physics list
and a range cut of 0.005 mm  (also happens for a 0.5 mm rangeCut)

I understand that the warning is normally caused by geometry problems, but why is it only issued when a scoring mesh is declared?

Thanks,
André

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1 None: RE: Track stuck warnings, only when using primitive scoring   (Asai, Makoto - 09 Jun, 2010)
(_ Ok: Re: RE: Track stuck warnings, only when using primitive scoring   (Andre Sailer - 09 Jun, 2010)
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