Abstract
A new Compton polarimeter was recently built in experimental Hall C at Jefferson Lab in order to meet the strict requirements on knowledge of electron beam polarization needed for the Qweak experiment. This polarimeter, modeled after the Hall A design[1], utilizes a circularly polarized green laser locked to a Fabry-Perot optical cavity intersecting the electron beam at a small angle (~1.3). Both the scattered electrons and the back-scattered photons are detected separately downstream of the interaction point, providing, in principle, two semi-independent measurements of the electron beam polarization.
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