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Intrabeam scattering studies with large-emittance-ratio ion beams in the relativistic heavy ion collider and implications for the electron-ion collider

Y. Luo*, B. Lepore, K. Mernick, W. Bergan, and S. Nagaitsev

  • *Contact author: yluo@bnl.gov
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Phys. Rev. Accel. Beams 29, 103501 – Published 8 October, 2026

DOI: https://doi.org/10.1103/1hf6-p4b8

Abstract

The electron-ion collider (EIC), to be constructed at Brookhaven National Laboratory, will collide polarized, high-energy electron beams with hadron beams, achieving peak luminosities of up to 1.0×1034  cm−2 s−1. To reach such high luminosity, the EIC will employ flat-beam collisions at the interaction point. The design transverse emittance ratio will be about 10∶1 in the hadron storage ring. Thanks to stochastic cooling and precise decoupling, we successfully generated and accelerated gold ion beams with a large emittance ratio of 11∶1 in the relativistic heavy ion collider. In this article, we present results of intrabeam scattering (IBS) measurements and modeling for large-emittance-ratio gold ion beams, both without and with controlled betatron coupling. To model the IBS growth, we use the formulas developed by Lebedev and Nagaitsev.

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Phys. Rev. Accel. Beams 29, 103501– Published 8 October, 2026
  • Received 4 May 2026
  • Accepted 11 September 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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