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None Tracks getting stuck 

Forum: Geometry
Date: 26 Jun, 2012
From: Josh Davies <Josh Davies>

I am having some issues with tracks getting stuck in my geometry, the step size becomes very small (O(10e-16)) and Geant takes tiny "steps" until I terminate the application. This only happens occasionally. The volume is a G4PVReplica. I see output like this:

14:*********************************************************************************************************
14:* G4Track Information:   Particle = gamma,   Track ID = 1,   Parent ID = 0
14:*********************************************************************************************************
14:
14:Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
...
14:12511958     -9.7    -18.2       50    0.0595        0 7.73e-16      22.9     siPixel Transportation
14:12511959     -9.7    -18.2       50    0.0595        0 7.73e-16      22.9     siPixel Transportation
14:12511960     -9.7    -18.2       50    0.0595        0 7.73e-16      22.9     siPixel Transportation
14:12511961     -9.7    -18.2       50    0.0595        0 7.73e-16      22.9     siPixel Transportation
14:12511962     -9.7    -18.2       50    0.0595        0 7.73e-16      22.9     siPixel Transportation
...

Searching, I've found a few threads where people find the same thing, but they all seem to be with older versions of Geant4 and people recommend updating, but I am using 4.9.4-patch03 which is newer than anything I can find with similar issues.

Also, I've been running the application without issues with higher energy primaries (~2MeV gamma,e-), and am only experiencing issues at lower energies (~60keV gamma).

Any ideas?

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1 None: Re: Tracks getting stuck   (Youming Yang - 27 Jun, 2012)
1 None: Re: Tracks getting stuck   (Josh Davies - 27 Jun, 2012)
1 None: Re: Tracks getting stuck   (Josh Davies - 28 Jun, 2012)
2 None: Re: Tracks getting stuck   (Youming Yang - 06 Jul, 2012)
2 None: Re: Tracks getting stuck   (Marc Verderi - 06 Jul, 2012)
1 Idea: Re: Tracks getting stuck   (Vladimir Ivanchenko - 06 Jul, 2012)
(_ None: Re: Tracks getting stuck   (Josh Davies - 06 Jul, 2012)
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