Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session 4WBA: Polarized Ion Sources and Targets IInvited Workshop
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Chair: Genki Nukazuka Room: Hilton Waikoloa Village Kona 1 |
Monday, November 27, 2023 2:00PM - 2:30PM |
4WBA.00001: A Polarized 3He Target for the CLAS12 Detector Invited Speaker: James Maxwell Polarized 3He nuclear targets have been invaluable surrogates for polarized neutron targets in spin-dependent scattering studies of the quark and gluon structure of matter. Traditional polarized 3He targets have seen dramatic improvements in the last three decades, however they have been limited in their use in spectrometers that utilize high-magnetic-field tracking systems, such as Jefferson Lab's CLAS12 spectrometer. Developments in high-magnetic-field metastability exchange optical pumping of 3He, recently brought to bear for a polarized 3He ion source for RHIC and the EIC, offer a path to a high-field polarized 3He fixed target. By combining these techniques with a double-cell cryogenic target design, such as the one used for the MIT-Bates 88-02 experiment, polarization and target density comparable to traditional polarized 3He targets can be reached while within a high magnetic field environment. We will discuss the conceptual design for such a target, share our progress in polarizing 3He with MEOP at JLab, and map out our path to a experiment ready target for Hall B. |
Monday, November 27, 2023 2:30PM - 3:00PM |
4WBA.00002: Development of Polarized 3He++ ion source at BNL Invited Speaker: Deepak Raparia We are also developing a high intensity (2. 1011ions per pulse) 3He++ polarized ion source for the future Electron Ion Collider (EIC). The polarized 3He++ ion beam help us to understand the spin structure of the neutron beam. This source will use a new technique which is based on the polarization of accumulated ultra-pure 3He gas in a high magnetic field by metastability-exchange optical pumping. Polarized gas will be ionized by the electron beam of the existing Electron Beam Ion Source (EBIS). An infrared laser system for pumping and measurement in the high field of EBIS has been developed. In the test setup, polarization of 80-85% has been achieved for ultra-pure 3He gas in the "Open" cell configuration with refilling valve tube inlet and isolation valve closed. The development of the spin-rotator and 3He-4He absolute nuclear polarimeter at 6 MeV 3He++ beam energy is also presented. |
Monday, November 27, 2023 3:00PM - 3:30PM |
4WBA.00003: Development of Polarized Lithium-6 Source for EIC Invited Speaker: Zein-Eddine Meziani The U.S.-based Electron-Ion Collider (EIC) will be one of the premier collider facilities for hadronic and nuclear physics in the following decades. One essential science goal of the EIC is to understand the spin of the nucleon and nucleus. The spin-dependent structure can only be accessed with polarized beams, and the polarized light ion beams including H, D, and 3He are already part of the EIC project, with the science extensively discussed. However, making also polarized ion beams with A>3 available will undoubtedly expand the scientific reach of EIC and benefit critical accelerator technologies. A good example is the polarized Lithium-6 nucleus which is interesting to probe modification of the spin-1/2 nucleon target or the scalar spin-1 deuteron target. Measurements with the polarized Lithium-6 source will allow the investigation of the polarized EMC effect and its A<!--[if gte msEquation 12]> style='mso-bidi-font-style:normal'>A dependence, hidden color and six quarks contributions to the deuteron embedded in Lithium-6. In this talk, we report the development of a polarized Lithium-6 source at Argonne. The polarized system utilizes a high-temperature oven and a convergence-divergence nozzle to generate a uniform Lithium-6 beam, which is then polarized through the optical pumping. The science with polarized Lithium sources, the technical details of the development, and some measurements of the beam profile will be discussed. |
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