Optically pumped polarized 3He++ ion source development for RHIC/EIC

Zelenski, A.; Atoian, G.; Beebe, E.; Ikeda, S.; Kanesue, T.; Kondrashev, S.; Maxwell, J.; Milner, R.; Musgrave, M.; Okamura, M.; Poblaguev, A. A.; Raparia, D.; Ritter, J.; Sukhanov, A.; Trabocchi, S.

doi:10.1016/j.nima.2023.168494

Title: Optically pumped polarized ³He⁺⁺ ion source development for RHIC/EIC

Journal Article · 27 June 2023 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI: https://doi.org/10.1016/j.nima.2023.168494 · OSTI ID:1988155

Zelenski, A. ^[1]; Atoian, G. ^[1]; Beebe, E. ^[1]; Ikeda, S. ^[1];

^[1];

^[1]; Maxwell, J. ^[2]; Milner, R. ^[3]; Musgrave, M. ^[3]; Okamura, M. ^[1];

^[1]; Raparia, D. ^[1]; Ritter, J. ^[1];

^[1]; Trabocchi, S. ^[1]

Brookhaven National Laboratory (BNL), Upton, NY (United States)
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)

The proposed polarized ³He⁺⁺ acceleration in RHIC and the future Electron-Ion Collider will require about 2×10¹¹ions in the source pulse. A new technique had been proposed for production of high intensity polarized ³He⁺⁺ ion beams. It is based on ionization and accumulation of the ³He gas (polarized by metastability-exchange optical pumping and in the 5T high magnetic field) in the existing Electron Beam Ion Source (EBIS). A novel ³He cryogenic purification and storage technique was developed to provide the required gas purity. An original gas refill and polarized 3 He gas injection to the EBIS long drift tubes, (which serves as the storage cell) were developed to ensure polarization preservation. An infrared laser system for optical pumping and polarization measurements in the high 3–5 T field has been developed. The ³He polarization 80–85% (and sufficiently long ~30 min relaxation time) was obtained in the “open” cell configuration with refilling valve tube inlet and isolation valve closed. The development of the spin-rotator and ³He⁴ He absolute nuclear polarimeter at 6 MeV ³He⁺⁺ beam energy is also presented here in this work.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177; SC0012704

OSTI ID:: 1988155

Alternate ID(s):: OSTI ID: 1996618

Report Number(s):: JLAB-PHY-23-3806; DOE/OR/23177-6112; BNL-224706-2023-JAAM; TRN: US2403833

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 1055; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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