1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

RHIC polarized proton operation in Run24

TUBN2
3 Jun 2025, 11:50
20m
Hall 201 (TICC)

Hall 201

TICC

Contributed Oral Presentation MC1.A01 Hadron Colliders TUBN:Colliders and Related Accelerators (Contributed)

Speaker

Kiel Hock (Brookhaven National Laboratory)

Description

The Relativistic Heavy Ion Collider (RHIC) Run 24 was 27 cryo weeks, operating with collisions at the STAR and sPHENIX detectors. The primary mode was polarized protons at 100 GeV, where there was 22 weeks of physics production. sPHENIX continued commissioning, becoming fully operational after 13 weeks and the addition of isobutane to their TPC gas mixture. STAR had a low luminosity run followed by twenty weeks of high luminosity and radially polarized beams. To reduce the beam-beam parameter and maximize the number of collisions within a small vertex region at sPHENIX, sPHENIX planned to operate with a crossing angle. For 8 weeks, collisions were only at sPHENIX until the beam-beam parameter was sufficiently low to support the additional collisions at STAR. A significant number of power dips earlier in the run greatly affected machine performance and reliability. At the maximum achieved performance, the luminosity was limited by four factors simultaneously: accelerating RF cavity intensity limit, intensity from the injectors, losses at rebucketing, and dynamic aperture. Despite these difficulties, sPHENIX and STAR were able to collect sufficient data commensurate with their goals.

Funding Agency

Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.

Region represented America
Paper preparation format LaTeX

Author

Kiel Hock (Brookhaven National Laboratory)

Co-authors

Grigor Atoian (Brookhaven National Laboratory) Eliorah Becker (Brookhaven National Laboratory) Kirsten Drees (Brookhaven National Laboratory) Oleg Eyser (Brookhaven National Laboratory) Russell Feder (Brookhaven National Laboratory) Wolfram Fischer (Brookhaven National Laboratory) Caitlin Giorgio (Brookhaven National Laboratory) Xiaofeng Gu (Brookhaven National Laboratory) Haixin Huang (Brookhaven National Laboratory) Robert Hulsart (Brookhaven National Laboratory) Brendan Lepore (Brookhaven National Laboratory) Chuyu Liu (Brookhaven National Laboratory) Yun Luo (Brookhaven National Laboratory) Gregory Marr (Brookhaven National Laboratory) Al Marusic (Brookhaven National Laboratory) Kevin Mernick (Brookhaven National Laboratory) Chaofeng Mi (Brookhaven National Laboratory) Frederic Micolon (Brookhaven National Laboratory) Robert Michnoff (Brookhaven National Laboratory) Michiko Minty (Brookhaven National Laboratory) John Morris (Brookhaven National Laboratory) Andrei Poblaguev (Brookhaven National Laboratory) Deepak Raparia (Brookhaven National Laboratory) Guillaume Robert-Demolaize (Brookhaven National Laboratory) Jon Sandberg (Brookhaven National Laboratory) Vincent Schoefer (Brookhaven National Laboratory) Freddy Severino (Brookhaven National Laboratory) Travis Shrey (Brookhaven National Laboratory) Patrick Talty (Brookhaven National Laboratory) Rachel Terheide (Brookhaven National Laboratory) Roberto Than (Brookhaven National Laboratory) Kin Yip (Brookhaven National Laboratory) Keith Zeno (Brookhaven National Laboratory)

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