|Message: Why are curvature radii different between the simple calculation and the simulation in a uniform magnetic field?||Not Logged In (login)|
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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.
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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