PoS - Proceedings of Science
Volume 456 - 25th International Symposium on Spin Physics (SPIN2023) - Polarized Source and Targets
Polarized ion sources at BNL
D. Raparia*, G. Atoian, E. Beebe, S. Ikeda, T. Kanesue, S. Kondrasheva, J. Maxwell, R. Miller, M. Musgrav, M. Okamura, A. Pobklaguev, J. Ritter, A. Sukhanov, S. Trabocchi and A. Zelenski
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Published on: July 30, 2024
Abstract
The Optically Pumped Polarized Ion Source (OPPIS) is providing polarized H- to the injector chain of the Relativistic Heavy Ion collider (RHIC), since 2000. The OPPIS had several upgrades. The latest up-grade, completed in 2022, included several improvements. Shorter low-energy beam transport and modi-fications to the helium, rubidium, and sodium cells were implemented to increase efficiency. These changes resulted in a 15% increase in beam intensity while maintaining similar polarization. A high-brightness primary beam from a fast atomic beam source, combined with optimized charge-exchange pro-cesses, led to the production of a high-intensity H- ion beam with 85% polarization. The high beam brightness and polarization led to impressive results. At 23 GeV, the beam exiting the Alternating Gradi-ent Synchrotron (AGS) maintained 75% polarization. In RHIC, colliding beams achieved polarization levels of 60-65% at energies between 100 and 250 GeV. We are also developing a high intensity (2.1011ions/pulse) 3He++ polarized ion source for the future Electron Ion Collider (EIC). This source will use a new technique which is based on the polarization of accumulated high purity 3He gas in high magnetic field by metastability-exchange optical pumping. The existing Electron Beam Ion Source (EBIS) will then ionize the polarized gas using its electron beam. We have developed an infrared laser system for both pumping and measurement within the high-field environment of EBIS. In the test setup, polarization of 80-85% has been achieved for ultra-pure 3He gas in the "Open" cell configuration. Additionally, we are developing a spin-rotator and an absolute nuclear polarimeter for the 6 MeV 3He++ beam, enabling precise measurement of the nuclear polarization.
DOI: https://doi.org/10.22323/1.456.0222
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