Experimental Demonstration of a Large Transverse Emittance Ratio 11:1 in the Relativistic Heavy Ion Collider for the Electron-Ion Collider

Luo, Y.; Xu, D.; Blaskiewicz, M.; Montag, C.

doi:10.1103/physrevlett.132.205001

Title: Experimental Demonstration of a Large Transverse Emittance Ratio 11 : 1 in the Relativistic Heavy Ion Collider for the Electron-Ion Collider

Journal Article · 13 May 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.132.205001 · OSTI ID:2382655

Luo, Y. ^[1];

^[1]; Blaskiewicz, M. ^[1]; Montag, C. ^[1]

Brookhaven National Laboratory (BNL), Upton, NY (United States)

The Electron-Ion Collider (EIC), to be constructed at Brookhaven National Laboratory, will collide polarized high-energy electron beams with hadron beams, achieving luminosities of up to 1.0 × 10³⁴ cm^–2 s^–1 in the center-of-mass energy range of 20–140 GeV. In order to achieve such high luminosity, the EIC will employ small and flat beams at the interaction point. In the hadron storage ring of the EIC, the ratio of horizontal to vertical emittances is approximately 11:1. In contrast, in previous or existing hadron colliders, the horizontal and vertical emittances are typically similar or closely matched. At the Relativistic Heavy Ion Collider (RHIC), we experimentally demonstrated a large transverse emittance ratio of 11:1 with gold ion beams at a particle energy of 100 GeV per nucleon, thanks to stochastic cooling and fine decoupling. Furthermore, we demonstrated collisions with flat beams, featuring a transverse beam size ratio of 3:1 for the first time at the RHIC.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0012704; AC05-06OR23177

OSTI ID:: 2382655

Report Number(s):: BNL--225743-2024-JAAM

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 132; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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