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Beam Physics Seminar
Sponsored by the Accelerator Division

"Electron Beam Polarimetry at Jefferson Lab"


Dave Gaskell,
Jefferson Lab


Knowledge of the polarization of the electron beam is the limiting systematic uncertainty for an increasing number of experiments at Jefferson Lab. For example, the Qweak experiment in Hall C and PREX experiment in Hall A both require a systematic uncertainty of dP/P=1% (or better) for the beam polarization. Future experiments proposed for 12 GeV are striving for 0.5%. In this presentation, I will give an overview of the techniques and devices used at Jefferson Lab to measure the electron beam polarization. In addition, I will discuss some of the efforts underway to either upgrade these devices or build new devices with the goal of improving the precision of polarization measurements. I will argue that the prudent experimentalist cannot rely on any single device exclusively and that multiple measurements of the polarization with multiple devices (in the same experimental hall as well as cross-hall comparisons) are key to achieving the high precision required.

Thursday, February 14, 2008
3:30 p.m.
ARC, Room 231/233


Talk Slides: (Slides)

For more information, please contact Dr. Alex Bogacz, Chair of CASA Seminar Committee