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Forum: Fields: Magnetic and Otherwise
Re: None Electron multiplication in Electric field : maximum acceptable step (David Sarria)
Date: 07 Jan, 2017
From: David Sarria <David Sarria>

Dear all,

I figured out that since there is only a constant E-field (no B-field), the motion of the electrons is known analytically. -> maybe using the exact solution will avoid any problem due to the interagtion that I am facing (see last message)

But apparently there is no exact solver for constant E-fields in Geant4 (there is however an exact solver constant B-fields). So I tried to implement it myself (based on the exact constant B-field solver).

I used the equation given as a solution by Bielajew et al. (see attached). However I add to cange the sign for the energy gain.

I think the equation are implemented correctly, but I have a lot of trouble for finding what chord distance I should use for the "distChord" method. I attached the source file for this new custom stepper (G4ExactUniEFStepper.cc and G4ExactUniEFStepper.hh)

Any help would be very appreciated.

Thanks in advance, -David Sarria

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/01/07/03.35-28389-equation_uniE.png
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/01/07/03.35-4411-G4ExactUniEFStepper.cc
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/01/07/03.35-72463-G4ExactUniEFStepper.hh

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