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Forum: Documentation and Examples
Re: Question electron range in TestEm18 (Yannick Arnoud)
Date: 07 May, 2009
From: Isabelle Fonteille <Isabelle Fonteille>

On Tue, 05 May 2009 17:16:35 GMT, Yannick Arnoud wrote:
>    Attachment:
>       http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/05/05/09.55-22633-dumpTexte.gif
>       http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/05/05/09.55-46331-dumpEcran.gif
>       http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/05/05/09.59-35030-electron.gif
> 
> Dear Geant 4 experts,
> 
> We are testing the energy loss of electrons in water. We used the
> TestEm18 example and obtained a very weird result for "low" energy
> electrons. All the 1 keV electrons we generate experience one
> interaction after 63.1 microns, and lose all their energy. The stepcut
> we use is 1 nm, far smaller than this 63 microns length.
> 
> Is our set of parameters wrong ? (see attached electron.mac) Do you have
> any piece of advice ?
> 
> Cheers,
> 
> Yannick and Isabelle
> 

You have got 1 step only, because you were using the default
  step limitation for the energy loss. I propose to add the next line
  to your macro

  /process/eLoss/StepFunction 0.1  1. nm 

  You can play the parameters of this command of course. The meaning and 
usage of this command can be found in the Physics Reference Manual,
  Electromagnetic Interactions, section 7.1.

  Hope this helps

  Laszlo

 P.S. BTW your question would be in a better place in the EM forum.

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1 Question: Re: electron range in TestEm18   (Isabelle Fonteille - 07 May, 2009)
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