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Question Why are curvature radii different between the simple calculation and the simulation in a uniform magnetic field? 

Forum: Fields: Magnetic and Otherwise
Date: 10 Feb, 2015
From: <Yoshihide>

Dear all,

I don't know why the curvature radii are different by 4% between simple calculation via R=p/0.3B and the simulation results in a uniform magnetic field. What is the source of the mismatch ? Something wrong with my treatment ?

The attached snapshot would be helpful to understand my questions.

 Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/02/10/03.37-34931-gnetic_field_snapshot.jpg

The conditions of my simulation are listed below.

- geant4.9.6.p03 is used

- Any electromagnetic physics processes are not implemented in PhysicsList, that is, positron is only bent by the uniform magnetic field.

- Positron is initially going along with z axis and has the momentum of (Px,Py,Pz)=(0,0,0.3 GeV)

- Magnetic field is applied via G4UniformMagField with (Bx,By,Bz) = (1 tesla, 0, 0) .

- G4ClassicalRK4 is used with the minimal step is 0.25 mm. (Another algorithm such as G4SimpleRunge and a different minimal step have been tried. The results are changed but the difference remains 4% level.)

Best Regards, Yoshihide

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1 Feedback: Re: Why are curvature radii different between the simple calculation and the simulation in a uniform magnetic field?   (Gumplinger Peter - 12 Mar, 2015)
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