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Title: Precise polarization measurements via detection of compton scattered electrons

The Qweak experiment at Jefferson Lab aims to make a 4% measurement of the parity-violating asymmetry in elastic scattering at very low Q{sup 2} of a longitudinally polarized electron beam off a proton target. One of the dominant experimental systematic uncertainties in Qweak will result from determining the beam polarization. A new Compton polarimeter was installed in the fall of 2010 to provide a non-invasive and continuous monitoring of the electron beam polarization in Hall C at Jefferson Lab. The Compton-scattered electrons are detected in four planes of diamond micro-strip detectors. We have achieved the design goals of <1% statistical uncertainty per hour and expect to achieve <1% systematic uncertainty.
Authors:
 [1] ;  [2] ;  [3] ;  [2]
  1. Manitoba Univ., Winnepeg (Canada)
  2. Mississippi State Univ., MS (United States)
  3. JLAB, Newport News, VA (United States)
Publication Date:
OSTI Identifier:
1114309
Report Number(s):
JLAB-PHY--14-1831; DOE/OR--23177-2958
Journal ID: ISSN 1063-7796; TRN: US1400143
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Journal Name: Physics of Particles and Nuclei; Journal Volume: 45; Journal Issue: 1; Conference: SPIN 2012, Dubna (Russian Federation), 17-22 Sep 2012
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC) (United States)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS