Simple Schematic of Jefferson Lab's Hall C Compton Polarimeter (image) DOE/Thomas Jefferson National Accelerator Facility Share Print E-Mail 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. Credit Jefferson Lab Usage Restrictions Images from Jefferson Lab that are in the public domain may be used without permission. If you use a Jefferson Lab image, it is requested that you credit Jefferson Lab as the source. If Jefferson Lab material is used for commercial purposes, especially including advertisements, it must not explicitly or implicitly convey Jefferson Lab's endorsement of commercial goods or services. As a courtesy, you can inform Jefferson Lab of your intended use of a photo by sending an email to firstname.lastname@example.org. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.