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Title: A high-finesse Fabry-Perot cavity with a frequency-doubled green laser for precision Compton polarimetry at Jefferson Lab

Here, a high-finesse Fabry-Perot cavity with a frequency-doubled continuous wave green laser (532 nm) has been built and installed in Hall A of Jefferson Lab for high precision Compton polarimetry. The infrared (1064 nm) beam from a ytterbium-doped fiber amplifier seeded by a Nd:YAG nonplanar ring oscillator laser is frequency doubled in a single-pass periodically poled MgO:LiNbO3 crystal. The maximum achieved green power at 5 W infrared pump power is 1.74 W with a total conversion efficiency of 34.8%. The green beam is injected into the optical resonant cavity and enhanced up to 3.7 kW with a corresponding enhancement of 3800. The polarization transfer function has been measured in order to determine the intra-cavity circular laser polarization within a measurement uncertainty of 0.7%. The PREx experiment at Jefferson Lab used this system for the first time and achieved 1.0% precision in polarization measurements of an electron beam with energy and current of 1.0 GeV and 50 μA.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [5] ;  [6] ;  [7] ;  [8] ;  [3] ;  [5] ;  [9] ;  [5] ;  [7] ;  [10] ;  [5]
  1. Syracuse Univ., Syracuse, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Old Dominion Univ., Norfolk, VA (United States)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. Carnegie Mellon Univ., Pittsburgh, PA (United States); Duquesne Univ., Pittsburgh, PA (United States)
  5. Univ. of Virginia, Charlottesville, VA (United States)
  6. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Univ. of Virginia, Charlottesville, VA (United States)
  7. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  8. Carnegie Mellon Univ., Pittsburgh, PA (United States); High Energy Accelerator Research Organization (KEK), Ibaraki (Japan)
  9. Carnegie Mellon Univ., Pittsburgh, PA (United States); Univ. of Washington, Seattle, WA (United States)
  10. Syracuse Univ., Syracuse, NY (United States)
Publication Date:
OSTI Identifier:
1245139
Report Number(s):
JLAB-PHY--16-2236; DOE/OR/23177--3783; arXiv:1601.00251
Journal ID: ISSN 0168-9002; PII: S016890021630119X
Grant/Contract Number:
AC05-06OR23177
Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 822; Related Information: CC0 1.0 Universal (CC0 1.0), Public Domain Dedication.; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY Compton polarimetry; Fabry–Perot cavity; laser polarization; polarized electron beam