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A High-Magnetic-Field Polarized 3He Target for Jefferson Lab’s CLAS12 Spectrometer

Conference ·
 [1]
  1. Thomas Jefferson National Laboratory, Newport News, Virginia, U.S.A.

We are developing a polarized 3He target concept for use in high luminosity electron scattering experiments in the high magnetic field environment of Jefferson Lab's CLAS12 spectrometer. By combining recent advancements in metastability exchange optical pumping of 3He with cryogenic, double-cell target methods such as those used for the MIT-Bates 88-02 experiment, a target with polarization and gas density comparable to traditional, low-field polarized 3He targets can be reached within high magnetic fields. We have established a new 3He pumping system at JLab, and are preparing for our first tests exploring polarization performance versus magnetic field and gas pressure in a single cell before we move to the construction of a full, cryogenic, double-cell prototype target.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
DOE Contract Number:
AC05-06OR23177
OSTI ID:
1972453
Report Number(s):
JLAB-PHY-22-3567; DOE/OR/23177-5434
Resource Relation:
Conference: Proceedings of the 24th International Spin Symposium (SPIN2021)
Country of Publication:
United States
Language:
English

References (9)

The CLAS12 Spectrometer at Jefferson Laboratory
  • Burkert, V. D.; Elouadrhiri, L.; Adhikari, K. P.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 959 https://doi.org/10.1016/j.nima.2020.163419
journal April 2020
Polarized 3 He cell development and application at NIST journal June 2011
A polarized 3He target for nuclear physics
  • Milner, R. G.; McKeown, R. D.; Woodward, C. E.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 274, Issue 1-2 https://doi.org/10.1016/0168-9002(89)90365-3
journal January 1989
Metastability exchange optical pumping of 3He gas up to hundreds of millibars at 4.7 Tesla journal September 2013
Development of a Polarized Helium-3 Source for RHIC and eRHIC journal January 2016
Enhanced polarization of low pressure 3 He through metastability exchange optical pumping at high field
  • Maxwell, J. D.; Alessi, J.; Atoian, G.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 959 https://doi.org/10.1016/j.nima.2019.02.019
journal April 2020
A concept for polarized 3He targets for high luminosity scattering experiments in high magnetic field environments
  • Maxwell, J. D.; Milner, R. G.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 1012 https://doi.org/10.1016/j.nima.2021.165590
journal October 2021
Attempts to increase the nuclear relaxation time of a3He gas at low temperatures journal July 1988
Relaxation of gaseous spin-polarized He 3 targets due to ionizing radiation journal May 1988

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