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Forum: Event and Track Management
Date: 25 Mar, 2003
From: ashfaq <ashfaq>


I am trying to simulate some pyhsical process using FADS. By tracking 
only Muons, I don,t have any problem but simulating physics processes 
like higgs creation, i face an error generated by G4Navigator and the
 program crashes. Detail error description is given below. 
Could someone helps me, how to get rid of this problem.  

particleName : kaon-  trackID: 279  processName : Transportation

Accuracy ERROR found in G4Navigator::ComputeStep: 
     The Step's starting point has moved 15583.95413 mm 
     since the last call to a Locate method.
     This has resulted in moving 15584.02313 mm  from the last point at
 which the safety      was calculated 
     which is more than the computed safety= 23.30524691 mm  at that point.

     This difference is 15560.71789 mm.
   This problem can be due to either 
    - a process that has proposed a displacement larger than the current 
safety , or
    - inaccuracy in the computation of the safety
    - if you are using a magnetic field, a known conflict about the 
safety exists in this case.
  We suggest that you 
   - find i) what particle is being tracked, and  ii) through what part
 of your geometry 
      for example by reruning this event with 
         /tracking/verbose 1 
    - check which processes you declare for this particle (and look at 
non-standard ones)
   - if possible create a detailed logfile of this event using:
         /tracking/verbose 6 
goofy: src/ G4double G4Navigator::ComputeStep(const 
G4ThreeVector &, const G4ThreeVector &, double, G4double &): Assertion 
`shiftOriginSafSq <= sqr(safetyPlus)' failed.


ashfaq ahmad

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1 Question: Re: Accuracy ERROR in G4Navigator   (Gabriele Cosmo - 01 Apr, 2003)
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