Physics Letters B (Mar 2017)
A novel comparison of Møller and Compton electron-beam polarimeters
- J.A. Magee,
- A. Narayan,
- D. Jones,
- R. Beminiwattha,
- J.C. Cornejo,
- M.M. Dalton,
- W. Deconinck,
- D. Dutta,
- D. Gaskell,
- J.W. Martin,
- K.D. Paschke,
- V. Tvaskis,
- A. Asaturyan,
- J. Benesch,
- G. Cates,
- B.S. Cavness,
- L. .A. Dillon-Townes,
- G. Hays,
- J. Hoskins,
- E. Ihloff,
- R. Jones,
- P.M. King,
- S. Kowalski,
- L. Kurchaninov,
- L. Lee,
- A. McCreary,
- M. McDonald,
- A. Micherdzinska,
- A. Mkrtchyan,
- H. Mkrtchyan,
- V. Nelyubin,
- S. Page,
- W.D. Ramsay,
- P. Solvignon,
- D. Storey,
- W.A. Tobias,
- E. Urban,
- C. Vidal,
- B. Waidyawansa,
- P. Wang,
- S. Zhamkotchyan
Affiliations
- J.A. Magee
- College of William and Mary, Williamsburg, VA 23187, USA
- A. Narayan
- Mississippi State University, Mississippi State, MS 39762, USA
- D. Jones
- University of Virginia, Charlottesville, VA 22904, USA
- R. Beminiwattha
- Ohio University, Athens, OH 45701, USA
- J.C. Cornejo
- College of William and Mary, Williamsburg, VA 23187, USA
- M.M. Dalton
- University of Virginia, Charlottesville, VA 22904, USA
- W. Deconinck
- College of William and Mary, Williamsburg, VA 23187, USA
- D. Dutta
- Mississippi State University, Mississippi State, MS 39762, USA
- D. Gaskell
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- J.W. Martin
- University of Winnipeg, Winnipeg, MB R3B2E9, Canada
- K.D. Paschke
- University of Virginia, Charlottesville, VA 22904, USA
- V. Tvaskis
- University of Winnipeg, Winnipeg, MB R3B2E9, Canada
- A. Asaturyan
- Yerevan Physics Institute, Yerevan, 375036, Armenia
- J. Benesch
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- G. Cates
- University of Virginia, Charlottesville, VA 22904, USA
- B.S. Cavness
- Angelo State University, San Angelo, TX 76903, USA
- L. .A. Dillon-Townes
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- G. Hays
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- J. Hoskins
- College of William and Mary, Williamsburg, VA 23187, USA
- E. Ihloff
- MIT Bates Linear Accelerator Center, Middleton, MA 01949, USA
- R. Jones
- University of Connecticut, Storrs, CT 06269, USA
- P.M. King
- Ohio University, Athens, OH 45701, USA
- S. Kowalski
- Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- L. Kurchaninov
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- L. Lee
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- A. McCreary
- University of Pittsburgh, Pittsburgh, PA 15260, USA
- M. McDonald
- University of Winnipeg, Winnipeg, MB R3B2E9, Canada
- A. Micherdzinska
- University of Winnipeg, Winnipeg, MB R3B2E9, Canada
- A. Mkrtchyan
- Yerevan Physics Institute, Yerevan, 375036, Armenia
- H. Mkrtchyan
- Yerevan Physics Institute, Yerevan, 375036, Armenia
- V. Nelyubin
- University of Virginia, Charlottesville, VA 22904, USA
- S. Page
- University of Manitoba, Winnipeg, MB R3E0W3, Canada
- W.D. Ramsay
- TRIUMF, Vancouver, BC V6T 2A3, Canada
- P. Solvignon
- Thomas Jefferson National Accelerator Facility, Newport News, VA 23606, USA
- D. Storey
- University of Winnipeg, Winnipeg, MB R3B2E9, Canada
- W.A. Tobias
- University of Virginia, Charlottesville, VA 22904, USA
- E. Urban
- Hendrix College, Conway, AR 72032, USA
- C. Vidal
- MIT Bates Linear Accelerator Center, Middleton, MA 01949, USA
- B. Waidyawansa
- Ohio University, Athens, OH 45701, USA
- P. Wang
- University of Manitoba, Winnipeg, MB R3E0W3, Canada
- S. Zhamkotchyan
- Yerevan Physics Institute, Yerevan, 375036, Armenia
- DOI
- https://doi.org/10.1016/j.physletb.2017.01.026
- Journal volume & issue
-
Vol. 766,
no. C
pp. 339 – 344
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 (<5 μA) during the Qweak 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
