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Question Is it possible to change physics process type just for a given volume/region? 

Forum: Physics List
Date: 15 May, 2007
From: Kamil Sedlak <kamil.sedlak@cern.ch>

Dear All,
  I am using the G4MultipleScattering process in my detector setup.
There is an alternative process G4CoulombScattering, which is believed
to be better suited for the thin materials.  However, switching from
G4MultipleScattering to G4CoulombScattering everywhere increses 
the execution time of my jobs by factor of ~10.
  Therefore I would like to use G4CoulombScattering only in a few very thin 
volumes, while employ G4MultipleScattering elsewhere.  Is this possible?
I did not find such an example, even though the "User's Guide: 
For Application Developers" (geant 4.8.3, chapter 5.2.1.1) indicates
this might be possible:

   * The processes described above use physics model classes, 
   which may be combined according to particle energy. 
   It is possible to change the energy range over which 
   different models are valid, and to apply other models 
   specific to particle type, energy range, and G4Region.

(I found a similar posting at http://geant4-hn.slac.stanford.edu:5090/HyperNews/public/get/emprocess/504.html , where an unofficial way of solving a similar problem is provided).

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1 None: Re: Is it possible to change physics process type just for a given volume/region?   (Vladimir IVANTCHENKO - 15 May, 2007)
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