Optically Pumped Polarized $^3$He$^{++}$ Ion Source Development for RHIC/EIC
Abstract
The proposed polarized He acceleration in RHIC and the future Electron-Ion Collider will require about ions in the source pulse. A new technique had been proposed for production of high intensity polarized He ion beams. It is based on ionization and accumulation of the He gas (polarized by metastability-exchange optical pumping and in the 5 T high magnetic field) in the existing Electron Beam Ion Source (EBIS). A novel He cryogenic purification and storage technique was developed to provide the required gas purity. An original gas refill and polarized 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 He polarization 80--85\% (and sufficiently long min relaxation time) was obtained in the \lq\lq{open}\rq\rq\ cell configuration with refilling valve tube inlet and isolation valve closed. The development of the spin-rotator and He He absolute nuclear polarimeter at 6 MeV He beam energy is also presented.
Cite
@article{arxiv.2303.10409,
title = {Optically Pumped Polarized $^3$He$^{++}$ Ion Source Development for RHIC/EIC},
author = {A. Zelenski and G. Atoian and E. Beebe and S. Ikeda and T. Kanesue and S. Kondrashev and J. Maxwell and R. Milner and M. Musgrave and M. Okamura and A. A. Poblaguev and D. Raparia and J. Ritter and A. Sukhanov and S. Trabocchi},
journal= {arXiv preprint arXiv:2303.10409},
year = {2023}
}
Comments
9 pages, 11 figures