Polarized ${{}^3\mathrm{He}}^{+2}$ ions in the Alternate Gradient Synchrotron to RHIC transfer line

Journal Article · Tue Sep 06 00:00:00 EDT 2016 · Physical Review Accelerators and Beams

DOI:https://doi.org/10.1103/PhysRevAccelBeams.19.094702· OSTI ID:1319964

Tsoupas, N.; Huang, H.; Méot, F.; Ptitsyn, V.; Roser, T.; Trbojevic, D.

The proposed electron-hadron collider (eRHIC) to be built at Brookhaven National Laboratory (BNL) will allow the collisions of 20 GeV polarized electrons with 250 GeV polarized protons, or 100 GeV/n polarized ³He⁺² ions, or other unpolarized ion species. The large value of the anomalous magnetic moment of the ³He nucleus G_He=(g₋2)/2=₋4.184 (where g is the g-factor of the ³He nuclear spin) combined with the peculiar layout of the transfer line which transports the beam bunches from the Alternate Gradient Synchrotron (AGS) to the Relativistic Heavy Ion Collider (RHIC) makes the transfer and injection of polarized ³He ions from AGS to RHIC (AtR) a special case as we explain in the paper. Specifically in this paper we calculate the stable spin direction of a polarized ³He beam at the exit of the AtR line which is also the injection point of RHIC, and lastly, we discuss a simple modifications of the AtR beam-transfer-line, to perfectly match the stable spin direction of the injected polarized ³He beam to that of the circulating beam, at the injection point of RHIC.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Grant/Contract Number: SC0012704
• OSTI ID: 1319964
• Alternate ID(s): OSTI ID: 1336203
• Report Number(s): BNL-113206-2016-JA; PRABFM; 094702
• Journal Information: Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Vol. 19 Journal Issue: 9; ISSN 2469-9888
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English

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