A High-Magnetic-Field Polarized 3He Target for JLab's CLAS12 Spectrometer

Conference · Tue Aug 01 04:00:00 EDT 2023

DOI:https://doi.org/10.22323/1.433.0010· OSTI ID:2203200

Maxwell, James ^[1]; Avakian, Harut ^[1]; Brock, James ^[1]; Keith, Chris ^[1]; Li, Xiaqing ^[2]; Milner, Richard ^[2]; Nguyen, Dien ^[1]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

We are developing a polarized 3He target for use in high luminosity electron scattering experiments within the high magnetic field environment of Jefferson Lab's CLAS12 spectrometer. By combining recent advancements in metastability exchange optical pumping (MEOP) of 3He with cryogenic, double-cell target methods as 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 field environments. We have begun polarizing sealed 3He cells at fields up to 5 T at Jefferson Lab, 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. A key focus of our research is the determination of polarization relaxation under the irradiation of an ionizing particle beam within high magnetic fields.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 2203200
• Report Number(s): JLAB-PHY-23-3770; DOE/OR/23177-5771
• Country of Publication: United States
• Language: English