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Forum: Physics List
Re: Question Muon Ionization spin problem (Pietro Bonfa')
Re: Idea Re: Muon Ionization spin problem (Vladimir Ivanchenko)
Re: Question Re: Muon Ionization spin problem (Pietro Bonfa')
Date: 25 Jan, 2011
From: Kevin Lynch <Kevin Lynch>

> 
> After first transportation Pol_Z goes from -1 to 0!
> 
> What am I missing?
> 

Hi Pietro,

I might be way off base here, but it sounds like you might not be using the right Equation of Motion or perhaps you haven't told the stepper to evolve enough equations. Here's an excerpt from some code I use to evolve muon spin in the presence of combined EM fields:

  equation = new G4EqEMFieldWithSpin(field);
  stepper = new G4ClassicalRK4(equation, 12); // modifies spin, so 12
  driver = new G4MagInt_Driver(0.01*mm, stepper, stepper->GetNumberOfVariables());
  chord = new G4ChordFinder(driver);

This may not be the optimal way to do things, but it seems to work for me. I hope that this helps you out.

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1 Question: Re: Muon Ionization spin problem   (Pietro Bonfa' - 26 Jan, 2011)
(_ None: Re: Muon Ionization spin problem   (Kevin Lynch - 26 Jan, 2011)
(_ None: Re: Muon Ionization spin problem   (Pietro Bonfa' - 26 Jan, 2011)
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