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Title: A Green Fabry-Perot Cavity for Jefferson Lab Hall A Compton Polarimetry

Abstract

A green laser (CW, 532 nm) based Fabry-Perot cavity for high precision Compton Polarimetry is under development in Hall A of the Jefferson Laboratory. In this paper, we present the principle and the preliminary studies for our test cavity.

Authors:
;  [1];  [2]
  1. Department of Physics, Syracuse University, Syracuse, NY 13244 (United States)
  2. Thomas Jefferson National Accelerator Facility, Newport News, VA 23606 (United States)
Publication Date:
OSTI Identifier:
21316877
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1149; Journal Issue: 1; Conference: 18. international spin physics symposium, Charlottesville, VA (United States), 6-11 Oct 2008; Other Information: DOI: 10.1063/1.3215613; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCURACY; BEAM MONITORING; CAVITY RESONATORS; CEBAF ACCELERATOR; ELECTRON SOURCES; FABRY-PEROT INTERFEROMETER; LASER RADIATION; LASERS; POLARIMETRY; POLARIZATION; POLARIZED BEAMS

Citation Formats

Rakhman, Abdurahim, Souder, Paul, and Nanda, Sirish. A Green Fabry-Perot Cavity for Jefferson Lab Hall A Compton Polarimetry. United States: N. p., 2009. Web. doi:10.1063/1.3215613.
Rakhman, Abdurahim, Souder, Paul, & Nanda, Sirish. A Green Fabry-Perot Cavity for Jefferson Lab Hall A Compton Polarimetry. United States. doi:10.1063/1.3215613.
Rakhman, Abdurahim, Souder, Paul, and Nanda, Sirish. 2009. "A Green Fabry-Perot Cavity for Jefferson Lab Hall A Compton Polarimetry". United States. doi:10.1063/1.3215613.
@article{osti_21316877,
title = {A Green Fabry-Perot Cavity for Jefferson Lab Hall A Compton Polarimetry},
author = {Rakhman, Abdurahim and Souder, Paul and Nanda, Sirish},
abstractNote = {A green laser (CW, 532 nm) based Fabry-Perot cavity for high precision Compton Polarimetry is under development in Hall A of the Jefferson Laboratory. In this paper, we present the principle and the preliminary studies for our test cavity.},
doi = {10.1063/1.3215613},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1149,
place = {United States},
year = 2009,
month = 8
}
  • 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:LiNbO 3 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 enhancementmore » 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.« less
  • We built and commissioned a new type of Compton polarimeter to measure the electron beam polarization at the Thomas Jefferson National Accelerator Facility (Virginia, USA). The heart of this polarimeter is a high-finesse monolithic Fabry-Perot cavity. Its purpose is to amplify a primary 300 mW laser beam in order to improve the signal to noise ratio of the polarimeter. It is the first time that a high-finesse Fabry-Perot cavity is enclosed in the vacuum of a particle accelerator to monitor the beam polarization by Compton polarimetry. The measured finesse and amplification gain of the cavity are F=26000 and G=7300. Themore » electron beam crosses this high-power photon source at an angle of 23 mrad in the middle of the cavity where the photon beam power density is estimated to be 0.85MW/cm2. We have used this facility during the HAPPEX experiment (April-July 1999) and we give a preliminary measurement of Compton scattering asymmetry.« less
  • We built and commissioned a new type of Compton polarimeter to measure the electron beam polarization at the Thomas Jefferson National Accelerator Facility (Virginia, USA). The heart of this polarimeter is a high-finesse monolithic Fabry-Perot cavity. Its purpose is to amplify a primary 300 mW laser beam in order to improve the signal to noise ratio of the polarimeter. It is the first time that a high-finesse Fabry-Perot cavity is enclosed in the vacuum of a particle accelerator to monitor the beam polarization by Compton polarimetry. The measured finesse and amplification gain of the cavity are F=26000 and G=7300. Themore » electron beam crosses this high-power photon source at an angle of 23 mrad in the middle of the cavity where the photon beam power density is estimated to be 0.85MW/cm2. We have used this facility during the HAPPEX experiment (April-July 1999) and we give a preliminary measurement of Compton scattering asymmetry.« less
  • This is a doctoral dissertation, in French, on the subject of study, design and realization of a Fabry-Perot cavity for the Compton polarimeter of TJNAF.