MOPM001

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URL	https://doi.org/10.18429/JACoW-IPAC2025-MOPM001
Title	RHIC Au operation in Run24
Authors	K. Hock, E. Becker, K. Drees, W. Fischer, C. Giorgio, H. Huang, R. Hulsart, B. Lepore, C. Liu, H. Lovelace III, G. Marr, A. Marusic, K. Mernick, C. Mi, R. Michnoff, M. Minty, J. Morris, G. Robert-Demolaize, J. Sandberg, V. Schoefer, T. Shrey, F. Severino, D. Steski, P. Talty, K. Yip, K. Zeno, K. Hughes, J. Haggerty, C. Dean Brookhaven National Laboratory F. Micolon Brookhaven National Laboratory, Brookhaven National Laboratory (BNL) J. Nagle University of Colorado Boulder, Colorado University at Boulder
Abstract	The Relativistic Heavy Ion Collider (RHIC) Run 24 was 27 weeks, operating with collisions at the STAR and sPHENIX detectors. The secondary running mode was gold at 100 GeV/u, where there was 3 weeks of operation. The goals of this run were to: reach an intensity of 1.8e9 ions/bunch and fully commission the 56 MHz cavity, ensure sPHENIX systems are ready for Run25,and deliver 1-2e9 minimum bias events for STAR. Beam was delayed 1 week due to two simultaneous failures of essential kicker systems: an AGS extraction bump power supply, and the yellow RHIC abort kicker. Elevated backgrounds at sPHENIX’s MAPS-based VerTeX (MVTX) detector required extensive studies and diagnostics. With a combination of local steering at sPHENIX and a large amplitude bump in the sector 10 and 12 arcs, the background levels with 12 bunches were reduced by a factor of 18. STAR was able to collect over 1.5e9 minimum bias events and the 56 MHz cavity was operated near its full voltage at 700 kV with 1.3e9 ions/bunch. This paper provides a summary of the run and details of the background studies.
Paper	download: MOPM001.pdf
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Conference	16th International Particle Accelerator Conference
Series
Location	Taipei, Taiwan
Date	01-06 Jun 2025
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	* Ming-Chyuan Lin - National Synchrotron Radiation Research Center * Yoichi Sato - KEK * Jui-Che Huang - National Synchrotron Radiation Research Center * David Button - Australian Nuclear Science and Technology Organisation * Ping-Shun Chuang - National Synchrotron Radiation Research Center
Online ISBN	978-3-95450-248-6
Online ISSN	2673-5490
Received	29 May 2025
Revised	31 May 2025
Accepted	02 June 2025
Issued	05 November 2025
DOI	10.18429/JACoW-IPAC2025-MOPM001
Pages	264-266
Copyright	Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.