|Message: Spin Tracking in B-field||Not Logged In (login)|
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Dear G4 Experts,
The question of Spin Tracking has been asked before in this category... Particularly, this post is pretty much a copy of what's written in the Application Manual: http://hypernews.slac.stanford.edu:5090/HyperNews/geant4/get/emfields/53/1.html
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 and for the secondaries.... I believe I did it exactly as it appears in the Manual and in the post specified. I would like to first see the Tracking of the Spin, but (0,0,0) doesn't make much sense to me at all
I understand that this question must be trivial, but I've stumbled for some time and cannot see what I'm doing wrong!!! Any suggestions??? THANKS!!! VK
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