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Idea Re: Reference physics lists + StepLimiter 

Forum: Physics List
Re: None Reference physics lists + StepLimiter (Kyrre Ness Sjøbæk)
Re: Note Re: Reference physics lists + StepLimiter (Kyrre Ness Sjøbæk)
Date: 28 Jan, 2010
From: Vladimir Ivanchenko <Vladimir Ivanchenko>

Hello,

There are two different things:
  1) how to add a physics constructor to existing G4VModularPhysicsList
  2) how to use StepLimiter
  3) what you need for the correct physics

Let go one by one: 1) Physics List factory is available inside Geant4, the example $G4INSTALL/examples/extended/hadronic/Hadr00

when one of the reference Physics lists is instantiated one can use myPhysicsList->AddPhysics(new PhysicsConstrucctor);

2) How to implement and/or use StepLimiters, please, look into $G4INSTALL/examples/extended/electromagnetic/TestEm3 or TestEm5, TestEm7, TestEm9.

Note, that one not need to apply the limiter on all particles - no sence for gamma, neutrons... Also it is pure Discrete process.

3) Step limiter may be useful for silicon but one sould not expect that limiting artifially the step size one would get the correct physics. In particular number of ionisation clusters and their position, because Geant4 ionisation models provide energy deposition at the step assuming that number of ionisations are large enough. A typical approach for particle detectors is that the Geant4 is simulated, the pre-step and post-step points are available, energy deposition is taken and an user code samples ionisation clusters. We have a helper class one can use.

VI

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1 Ok: Re: Reference physics lists + StepLimiter   (Kyrre Ness Sjøbæk - 28 Jan, 2010)
(_ None: Re: Reference physics lists + StepLimiter   (John Allison - 28 Jan, 2010)
(_ More: Re: Reference physics lists + StepLimiter   (Vladimir Ivanchenko - 28 Jan, 2010)
(_ Ok: Re: Reference physics lists + StepLimiter   (Kyrre Ness Sjøbæk - 29 Jan, 2010)
(_ None: Re: Reference physics lists + StepLimiter   (Colin Paul Gloster - 29 Jan, 2010)
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