[Halld-tagger] About monitoring of the photon circular polarization

[Eugene Chudakov]

I mentioned at the beam meeting that one can potentially detect/monitore the circular polarization of a photon beam, but did not remember the details. Meanwhile, I recalled it - one can use the Compton scattering on longitudinally polarized electrons (in iron). I attach a few plots showing the kinematics, the cross section and the analyzing power. I do not know at this time whether it is practical or not for the GDH project.

Eugene

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