Precision Electron-Beam Polarimetry at 1 GeV Using Diamond Microstrip Detectors

Narayan, A.; Jones, D.; 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.; Dillon-Townes, L. A.; Hays, G.; 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, A.; Urban, E.; Vidal, C.; Waidyawansa, B.; Wang, P.; Zhamkotchyan, S.

doi:10.1103/PhysRevX.6.011013

Title: Precision Electron-Beam Polarimetry at 1 GeV Using Diamond Microstrip Detectors

Journal Article · Tue Feb 16 00:00:00 EST 2016 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.6.011013· OSTI ID:1238090

Narayan, A.; Jones, D.; 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.; Dillon-Townes, L. A.; Hays, G.; Ihloff, E.; Jones, R.; King, P. M.; Kowalski, S. more »

We report on the highest precision yet achieved in the measurement of the polarization of a low energy, O(1 GeV), electron beam, accomplished using a new polarimeter based on electron-photon scattering, in Hall~C at Jefferson Lab. A number of technical innovations were necessary, including a novel method for precise control of the laser polarization in a cavity and a novel diamond micro-strip detector which was able to capture most of the spectrum of scattered electrons. The data analysis technique exploited track finding, the high granularity of the detector and its large acceptance. The polarization of the 180 μA, 1.16~GeV electron beam was measured with a statistical precision of <~1\% per hour and a systematic uncertainty of 0.59\%. This exceeds the level of precision required by the \qweak experiment, a measurement of the vector weak charge of the proton. Proposed future low-energy experiments require polarization uncertainty <~0.4\%, and this result represents an important demonstration of that possibility. This measurement is also the first use of diamond detectors for particle tracking in an experiment.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Mississippi State Univ., Mississippi State, MS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177; FG02-07ER41528

OSTI ID:: 1238090

Alternate ID(s):: OSTI ID: 1238141; OSTI ID: 1599642

Report Number(s):: JLAB-PHY-15-2108; DOE/OR/23177-3554; PRXHAE; 011013

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 6 Journal Issue: 1; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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