PoS - Proceedings of Science
Volume 433 - 19th Workshop on Polarized Sources, Targets and Polarimetry (PSTP2022) - Session 12
High-precision Møller Polarimetry at Jefferson Lab's Hall A
E. King
Full text: pdf
Pre-published on: May 31, 2023
Published on: August 04, 2023
The Thomas Jefferson National Accelerator Facility (JLab) operates the Continuous Electron Beam Accelerator Facility which produces a polarized electron beam which is delivered to four experimental halls and is utilized to probe the fundamental nature of matter. Parity-violating electron scattering experiments are one category of experiments that are run at JLab. For these experiments, knowledge of the beam polarization is a key source of systematic uncertainty.
The Møller polarimeter, one of three polarimetry tools in experimental Hall A, operates by taking advantage of the QED spin asymmetry of Møller scattering of beam electrons on a magnetically saturated iron target foil. The upcoming MOLLER experiment has a high-precision polarimetry requirement of 0.42\% or less. Here, I'll discuss the preparations underway and lessons learned during PREX-2 and CREX which will allow the Hall A Møller polarimeter to meet this requirement.
DOI: https://doi.org/10.22323/1.433.0030
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