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On Thu, 15 Mar 2012 20:50:42 GMT, Tom Roberts wrote:
> 3. The constructor of G4Mag_SpinEqRhs takes a G4MagneticField, not a > G4ElectroMagneticField. As a result, the particles do not see any electric > field -- neither spin nor momentum are changed by an E field.
I just stumbled across G4EqEMFieldWithSpin. It appears to resolve this -- a quick test shows that a mu+ moves in a constant E field just as for the usual equation of motion without spin, and the spin precessed a little bit.
In my class derived from G4ElectroMagneticField, I simply replaced G4EquationOfMotion *e = new G4Mag_SpinEqRhs((G4MagneticField*)this); pStepper = new G4ClassicalRK4(e,12); with G4EquationOfMotion *e = new G4EqEMFieldWithSpin(this); pStepper = new G4ClassicalRK4(e,12);