Ultrahigh-precision Compton polarimetry at 2 GeV

A. Zec, S. Premathilake, J. C. Cornejo, M. M. Dalton, C. Gal, D. Gaskell, M. Gericke, I. Halilovic, H. Liu, J. Mammei, R. Michaels, C. Palatchi, J. Pan, K. D. Paschke, B. Quinn, and J. Zhang
Phys. Rev. C 109, 024323 – Published 23 February 2024
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  • INTRODUCTION
  • HALL A COMPTON POLARIMETER
  • LASER SYSTEM
  • PHOTON DETECTOR
  • RESULTS
  • CONCLUSION
  • ACKNOWLEDGMENTS
    • References

    Abstract

    We report a high precision measurement of electron beam polarization using Compton polarimetry. The measurement was made in experimental Hall A at Jefferson Lab during the CREX experiment in 2020. A total uncertainty of dP/P=0.36% was achieved detecting the back-scattered photons from the Compton scattering process. This is the highest accuracy in a measurement of electron beam polarization using Compton scattering ever reported, surpassing the groundbreaking measurement from the SLD Compton polarimeter. Such uncertainty reaches the level required for the future flagship measurements to be made by the MOLLER and SoLID experiments.

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    • Received 8 October 2023
    • Accepted 16 January 2024

    DOI:https://doi.org/10.1103/PhysRevC.109.024323

    ©2024 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Beam diagnosticsBeam polarizationCompton scatteringElectron beams & opticsPolarization phenomenaSpin polarization
    1. Physical Systems
    ElectronsLaser applications
    Accelerators & BeamsParticles & FieldsNuclear PhysicsAtomic, Molecular & Optical

    Authors & Affiliations

    A. Zec1, S. Premathilake1, J. C. Cornejo2, M. M. Dalton3,*, C. Gal1,3,4,5, D. Gaskell3, M. Gericke6, I. Halilovic6, H. Liu7, J. Mammei6, R. Michaels3, C. Palatchi1,5, J. Pan6, K. D. Paschke1, B. Quinn2, and J. Zhang4,5,8

    • 1Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
    • 2Physics Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
    • 3Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
    • 4Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794, USA
    • 5Center for Frontiers in Nuclear Science, State University of New York, Stony Brook, New York 11794, USA
    • 6Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T2N2 Canada
    • 7Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA
    • 8Institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Qingdao, Shandong 266237, China

    • *dalton@jlab.org

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    Issue

    Vol. 109, Iss. 2 — February 2024

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