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Question non-uniform electric field in chamber 

Forum: Fields: Magnetic and Otherwise
Date: 28 Jun, 2008
From: <janitor0405@126.com>

Dear sir,
   I am a beginner of Geant4,I want to setup a non-uniform electric field in my chamber filled with Xenon,I follow the example from/advanced/purging_magnet,I just made a conversion from the magnetic field to electric field,compiling is completed but when beamOn I receive some strange information as follows:

---> Begin Of Event: 0
G4MagIntegratorDriver::OneGoodStep: Stepsize underflow in Stepper
  Step's start x=7.24397 and end x= 7.24397 are equal !!
  Due to step-size= 5.62767e-20 . Note that input step was 0.562767
G4MagIntegratorDriver::OneGoodStep: Stepsize underflow in Stepper
  Step's start x=0.410347 and end x= 0.410347 are equal !!
  Due to step-size= 1.08637e-20 . Note that input step was 10.8637
G4MagIntegratorDriver::OneGoodStep: Stepsize underflow in Stepper
                           ....
I really don't know what is the problem,I need some help.can you help me?thank you very much.
                                                                   janitor

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1 None: Re: non-uniform electric field in chamber   (janitor0405@126.com - 01 Jul, 2008)
(_ Feedback: Re: non-uniform electric field in chamber   (Gumplinger Peter - 02 Jul, 2008)
(_ None: Re: non-uniform electric field in chamber   (janitor0405@126.com - 04 Jul, 2008)
(_ News: Re: non-uniform electric field in chamber   (Sunring Ling - 12 Mar, 2012)
1 None: Re: non-uniform electric field in chamber   (Sunring Ling - 12 Mar, 2012)
2 Disagree: Re: non-uniform electric field in chamber   (Gumplinger Peter - 12 Mar, 2012)
3 None: Re: non-uniform electric field in chamber   (John Apostolakis - 13 Mar, 2012)
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