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Question Field and particles 

Forum: Fields: Magnetic and Otherwise
Date: 09 Dec, 2010
From: Nickolay Smirnov <Nickolay Smirnov>

Every time I try to raise a magnetic field to a higher values my particle dies, because it's "looping" or "stuck". What does it mean and is there a method of raising that number of trials mentioned in output? Or how can I adjust something to force it work properly? Thanks.

 Particle = proton, 200*GeV
 By = 1*Tesla

Output:

*********************************************************************************************************
* G4Track Information:   Particle = proton,   Track ID = 1,   Parent ID = 0
*********************************************************************************************************

Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
    0   -1e+05        0        0     2e+05        0        0         0     expHall initStep
    1        0        0        0     2e+05        0    1e+05     1e+05       field Transportation
    2 2.31e+03        0     3.99     2e+05        0 2.31e+03  1.02e+05       field Transportation
    3 4.63e+03        0       16     2e+05        0 2.31e+03  1.05e+05       field Transportation
    4 6.94e+03        0     35.9     2e+05        0 2.31e+03  1.07e+05       field Transportation
    5 9.25e+03        0     63.9     2e+05        0 2.31e+03  1.09e+05       field Transportation
    6 1.16e+04        0     99.8     2e+05        0 2.31e+03  1.12e+05       field Transportation
    7 1.39e+04        0      144     2e+05        0 2.31e+03  1.14e+05       field Transportation
    8 1.62e+04        0      196     2e+05        0 2.31e+03  1.16e+05       field Transportation
    9 1.85e+04        0      255     2e+05        0 2.31e+03  1.19e+05       field Transportation
   10 2.08e+04        0      323     2e+05        0 2.31e+03  1.21e+05       field Transportation
   11 2.31e+04        0      399     2e+05        0 2.31e+03  1.23e+05       field Transportation
 G4Transportation is killing track that is looping or stuck 
   This track has 200000 MeV energy.
   Number of trials = 10   No of calls to AlongStepDoIt = 12
   12 2.54e+04        0      483     2e+05        0 2.31e+03  1.25e+05       field Transportation
Track (trackID 1, parentID 0) is processed with stopping code 2
### pop requested out of 0 stacked tracks.
### 0 waiting tracks are re-classified to
     0 urgent tracks and 0 waiting tracks.
NULL returned from G4StackManager.
Terminate current event processing.

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