Simple Schematic of Jefferson Lab's Hall C Compton Polarimeter (IMAGE)
Caption
Jefferson Lab's Hall C Compton Polarimeter measures the polarization of the CEBAF electron beam just before it reaches the experiment. The electrons collide with laser light -- some of the electrons are knocked of their nominal path and are separated from the main beam by a dipole. The dipole acts on the electrons in a manner similar to the way a prism acts on light, separating out the slower-moving electrons that came from collisions with the laser. These slower electrons are then counted in a detector, which allows the determination of the polarization.
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Jefferson Lab
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