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  1. VecGeom
  2. VECGEOM-540

Stuck tracks during propagation for CutTubs

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Details

    • Improvement
    • Status: Done (View Workflow)
    • Low
    • Resolution: Done
    • None
    • 2022/06
    • volumes
    • None

    Description

      For tracking in magnetic field in CMS detector we observe tracks being stuck and need pushes to recover. This happens with VecGeom installation (not with native geometry) and in volumes which are unions of CutTubs. The error message looks like:

          • G4Exception : GeomNav1002
            issued by : G4Navigator::ComputeStep()
            Stuck Track: potential geometry or navigation problem.
            Track stuck, not moving for 10 steps.
            Current phys volume: 'PixelForwardInnerDiskOuterRing'
      • at position : (-20.21612115201446,114.9815721065278,-390.2499999993482)
        in direction: (-0.0560404498019309,0.3135342786240882,-0.9479217921926207)
        (local position: (-20.21612115201446,114.9815721065278,13.25000000065182))
        (local direction: (-0.0560404498019309,0.3135342786240882,-0.9479217921926207)).
        Previous phys volume: 'PixelForwardDiskZminus'

      Likely geometry overlap - else navigation problem !

          • Trying to get unstuck using a push - expanding step to 1e-07 (mm) ... Potential overlap in geometry !
          • This is just a warning message. ***
            -

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              mgheata Mihaela Gheata (Inactive)
              banerjee Sunanda Banerjee
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                Updated:
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