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Hi all, I'm trying to implement a time dependent magnetic field based upon the proper and local time of the particle to be tracked through the magnetic field. I derive my own magnetic field from G4MagneticField. Inside my derived magnetic field class, how can I gain access to the particle's properties? I have tried G4Track *track; G4double localTime = track -> GetLocalTime(); but I get a segmentation fault once the particle enters my magnetic field region. If this method is wrong, is there possibly a better way to implement a time dependent B-field? The time component of the position 4-vector that gets passed to the GetFieldValue() doesn't seem change as the particle moves through the field region. Many Thanks for all the good work! ~Zach Hartwig
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