|Message: Re: Spin Tracking in B-field||Not Logged In (login)|
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> Now, my really simple setup is Global Magnetic Field(in x-dir) with > G4UniformMagneticField, plus I've included exactly the same code as in > the Manual for Spin Tracking(or the post link just above). I've set > Beam's polarization as (0, 0, 1) and it just hits a target. I use > QGSP_BERT physics list. Upon generation of the primary(I shoot 100GeV > e-) I can see that it has proper polarization vector. But when I catch > it in the Sensetive Detector(World is SD for now...) and do > GetPolarization it gives me (0,0,0) for the primary
How do you identify the 'primary' e-; with:
aTrack->GetParentID() == 0
and (&&) for good measure also:
aTrack->GetTrackID() == 1
You can also follow the progression of the spin with G4SteppingVerbose by setting the verbosity to 4.
> and for the > secondaries....
Secondaries won't have spin/polarization unless the process creating them also specifies their polarization. The only processes that do that are in:
and G4eplusAnnihilation, G4eeToTwoGammaModel, G4SynchrotronRadiation(InMat), G4Scintillation anhd G4Cerenkov - but the latter are all secondary photons.
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