A novel comparison of Møller and Compton electron-beam polarimeters

Journal Article · Wed Mar 01 00:00:00 EST 2017 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2017.01.026· OSTI ID:1343161

Magee, J. A.; Narayan, A.; Jones, D.; Beminiwattha, R.; Cornejo, J. C.; Dalton, M. M.; Deconinck, W.; Dutta, D.; Gaskell, D.; Martin, J. W.; Paschke, K. D.; Tvaskis, V.; Asaturyan, A.; Benesch, J.; Cates, G.; Cavness, B. S.; .A. Dillon-Townes, L.; Hays, G.; Hoskins, J.; Ihloff, E. ; Jones, R.; King, P. M.; Kowalski, S.; Kurchaninov, L.; Lee, L.; McCreary, A.; McDonald, M.; Micherdzinska, A.; Mkrtchyan, A.; Mkrtchyan, H.; Nelyubin, V.; Page, S.; Ramsay, W. D.; Solvignon, P.; Storey, D.; Tobias, W. A.; Urban, E.; Vidal, C.; Waidyawansa, B.; Wang, P.; Zhamkotchyan, S.

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.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Mississippi State Univ., Starkville, MS (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Grant/Contract Number: AC05-06OR23177; FG02-07ER41528
• OSTI ID: 1343161
• Alternate ID(s): OSTI ID: 1342509; OSTI ID: 1599635
• Report Number(s): JLAB-PHY-16-2333; DOE/OR/23177-3929; arXiv:1610.06083; S0370269317300333; PII: S0370269317300333
• Journal Information: Physics Letters B, Journal Name: Physics Letters B Vol. 766 Journal Issue: C; ISSN 0370-2693
• Publisher: Elsevier
• Country of Publication: Netherlands
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
electron polarimetry
Compton polarimeter
Møller polarimeter
Jefferson Lab