| Summary: | propagation of a particle in a uniform electric field (Geant4 2.0) | ||
|---|---|---|---|
| Product: | Geant4 | Reporter: | lagouri |
| Component: | geometry/magneticfield | Assignee: | John Apostolakis <John.Apostolakis> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | ||
| Priority: | P2 | ||
| Version: | 2.0 | ||
| Hardware: | PC | ||
| OS: | Linux | ||
*** Bug 138 has been marked as a duplicate of this bug. *** *** 'John.Apostolakis@cern.ch' will be responsible for bug 138. *** Could you please try out release 3.1 ? Rather important fixes and improvements have been applied to the mag-field module and transportation in this new release. Let us know if you still notice any problem. Thanks. We have verified that our fixes, published in Geant4 4.0, have corrected the errors that we were able to reproduce. |
I have similar problems as in the reported problem no.138 in the case of a uniform electric field (3 V) a)Trying to propagate neutrons of 0.2 eV G4PropagatorInField::ComputeStep ERROR : attempting a zero step= 1.83599e-15 and/or no progress after 11 trial steps. ABORTING. G4PropagatorInField::ComputeStep No progress - Looping with zero steps *** G4Exception: Aborting execution *** Aborted b)Trying to propagate electrons of 2 MeV (I would like to mention that in the case of lower energy electrons of the order of eV there is no this kind of problem) * G4Track Information: Particle = e-, Track ID = 1, Parent ID = 0 ********************************************************************************************************* Step# X(mm) Y(mm) Z(mm) KinE(MeV) dE(MeV) StepLeng TrackLeng NextVolume ProcName 0 0 0 1 2 0 0 0 chamber initStep 1 -7.33 200 1 2 0.000386 200 200 World Transportation Warning (G4MagIntegratorDriver): The stepsize for the next iteration=1.2795e-14 is too small - in Step number 1. Requested step size was 255.899 . Previous step size was 255.899 . The minimum for the driver is 0.01 The integrations has already gone 2.55899e-15 G4PropagateInField: Warning: Particle is looping - tracking in field will be stopped. It has performed 10000 steps in Field while a maximum of 10000 are allowed. 2 -8.09 207 1.04 2 0 7.35 208 World Transportation G4PropagateInField: Warning: Particle is looping - tracking in field will be stopped. It has performed 10000 steps in Field while a maximum of 10000 are allowed. 3 -8.32 209 1.05 2 0 2.19 210 World Transportation G4PropagateInField: Warning: Particle is looping - tracking in field will be stopped. It has performed 10000 steps in Field while a maximum of 10000 are allowed. 4 -8.8 214 1.07 2 0 4.48 214 World Transportation G4PropagateInField: Warning: Particle is looping - tracking in field will be stopped. It has performed 10000 steps in Field while a maximum of 10000 are allowed. 5 -8.8 214 1.07 2 0 2.56e-11 214 World Transportation G4PropagateInField: Warning: Particle is looping - tracking in field will be stopped. It has performed 10000 steps in Field while a maximum of 10000 are allowed. 6 -8.8 214 1.07 2 0 2.56e-11 214 World Transportation G4PropagateInField: Warning: Particle is looping - tracking in field will be stopped. It has performed 10000 steps in Field while a maximum of 10000 are allowed. 7 -8.8 214 1.07 2 0 2.56e-11 214 World Transportation 8 -8.8 214 1.07 2 0 1.28e-15 214 World Transportation 9 -8.8 214 1.07 2 0 6.4e-16 214 World Transportation 10 -8.8 214 1.07 2 0 1.6e-16 214 World Transportation 11 -8.8 214 1.07 2 0 4e-17 214 World Transportation 12 -8.8 214 1.07 2 0 1e-17 214 World Transportation 13 -8.8 214 1.07 2 0 2.5e-18 214 World Transportation 14 -8.8 214 1.07 2 0 6.25e-19 214 World Transportation 15 -8.8 214 1.07 2 0 1.56e-19 214 World Transportation G4PropagatorInField::ComputeStep ERROR : attempting a zero step= 3.90444e-20 and/or no progress after 11 trial steps. ABORTING. G4PropagatorInField::ComputeStep No progress - Looping with zero steps *** G4Exception: Aborting execution *** Aborted