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Enhanced polarization of low pressure 3 He through metastability exchange optical pumping at high field

Journal Article · · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
 [1];  [2];  [2];  [2];  [1];  [1];  [1];  [2];  [2];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Lab. for Nuclear Science
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.
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Here, we report high steady-state nuclear polarization of 1 torr 3He gas nuclei via metastability exchange optical pumping at magnetic fields above 2 T. The introduction of highly polarized 3He gas into Brookhaven’s Electron Beam Ion Source would enable a new, polarized 3He ion source for use at the Relativistic Heavy Ion Collider and a future Electron–Ion Collider facility. By adapting recent developments in high field metastability exchange optical pumping for higher pressure gas, we have successfully polarized 1 torr 3He sealed cells in the EBIS solenoid. Through careful manipulation of the RF discharge parameters, polarizations above 80% were attained at 2, 3 and 4 T, with 89% being reached at 3 T with a 664 s relaxation time.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Grant/Contract Number:
SC0008740; SC0012704
OSTI ID:
1607711
Alternate ID(s):
OSTI ID: 1636356
Report Number(s):
BNL--213773-2020-JAAM
Journal Information:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Journal Issue: C Vol. 959; ISSN 0168-9002
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (13)

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journal November 2014
Diffusive transfer of polarized 3He gas through depolarizing magnetic gradients
  • Maxwell, J. D.; Epstein, C. S.; Milner, R. G.
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journal March 2015
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Related Subjects

43 PARTICLE ACCELERATORS
3He polarization
High magnetic field
Metastability exchange optical pumping