A novel comparison of Møller and Compton electron-beam polarimeters
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Author(s)
Kowalski, Stanley B
Date Issued
January 2017
Journal
Physics Letters B
Publisher
Elsevier BV
Citation
Magee, J. A., et al. “A Novel Comparison of Møller and Compton Electron-Beam Polarimeters.” Physics Letters B, vol. 766, Mar. 2017, pp. 339–44. © 2017 The Authors
Version
Final published version
Abstract
We have performed a novel comparison between electron-beam polarimeters based on Møller and Compton scattering. A sequence of electron-beam polarization measurements were performed at low beam currents (< 5μA) during the Q[subscript weak] experiment in Hall-C at Jefferson Lab. These low current measurements were bracketed by the regular high current (180 μA) operation of the Compton polarimeter. All measurements were found to be consistent within experimental uncertainties of 1% or less, demonstrating that electron polarization does not depend significantly on the beam current. This result lends confidence to the common practice of applying Møller measurements made at low beam currents to physics experiments performed at higher beam currents. The agreement between two polarimetry techniques based on independent physical processes sets an important benchmark for future precision asymmetry measurements that require sub-1% precision in polarimetry. Keywords: Electron polarimetry, Compton polarimeter, Møller polarimeter, Jefferson Lab
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/J.PHYSLETB.2017.01.026
