|Message: G4MagIntegratorDriver::OneGoodStep error||Not Logged In (login)|
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Hi all, I'm having problems with a user-defined solenoid field. I have set up the field and tested it with a few dry runs and it seems to work ok. However, some events produce the following 'error' output: G4MagIntegratorDriver::OneGoodStep: Stepsize underflow in Stepper Step's start x=16376 and end x= 16376 are equal !! Due to step-size= 2.5e-13 . Note that input step was 2.5e-06 This is something that randomly happens and I call it an 'error' because it doesn't cause the program to crash, merely locks it up. I have tried changing my MaxAllowedStep for my volume and I don't seem to get the error if I reduce the step length to something on the order of 10mm. However, this vastly reduces the speed of the tracking (18 hours to track 1000 events compared to a few seconds...) Has anyone seen this error and know the cause or a workaround? Cheers, John
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