|Message: Re: Spin Tracking in B-field||Not Logged In (login)|
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Thanks a lot for your quick reply!!! To answer couple of your questions:
>>> How do you identify the 'primary' e-; with: >>> aTrack->GetParentID() == 0 >>> and (&&) for good measure also: >>> aTrack->GetTrackID() == 1
That's exactly what I do in SD, except I do not call aTrack->GetTrackID()==1. Not 100% sure in here, but isn't it redundant - anyway that's not the most important - I will add it...
>>> You can also follow the progression of the spin with G4SteppingVerbose by >>> setting the verbosity to 4. >>> /tracking/verbose 4
So, first of, i used QGSP_BERT, which seems like it doens't contain Polarization Physics - that was my mistake number 1!!!
Second, I copied Physics Lists from Geant4.10 examples/extended/polarization/Pol01, this example seems to contain Polarization EM Physics - which is exactly what I need.... Did that!
But here are the issues I found after correcting Physics List: As you suggested, I used /tracking/verbose 4: I attached just 2 snapshots for e- primary and for gamma(one of the secondaries)... For e- primary, you can notice that PreStep Polarization is set correctly, but the PostStep one - by some reason it's 0. The process here is Transportation... Any ideas??? For gamma, however, there is a spin info.... There was none for secondary e-, I didn't attach it here....
To point out the difference from QGSP_BERT, using QGSP_BERT gammas would have 0 polarization too - therefore, I assumed just above that QGSP_BERT doesn't cover Polarization....
Attachment: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/04/29/16.49-61815-eprimary.txt http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/04/29/16.49-82512-gamma.txt
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