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RHIC Heavy Ion Operations THE RHIC TEAM Brookhaven National Lab LHC-LUMI-2005 Arcidosso

This report highlights the successful operation and optimization of RHIC's Run-5 Cu-Cu heavy ion collisions, including accurate luminosity predictions, beta squeeze improvements, and in-run intensity optimization. It also discusses excellent machine availability, weekly luminosity and physics time, and the overall 5-year performance of RHIC.

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RHIC Heavy Ion Operations THE RHIC TEAM Brookhaven National Lab LHC-LUMI-2005 Arcidosso

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  1. RHIC Heavy Ion OperationsTHE RHIC TEAMBrookhaven National LabLHC-LUMI-2005Arcidosso

  2. Run-5 Cu-Cu Integrated Luminosity RHIC Run 5 Delivered s= 200 GeV/uCu-Cu Luminosity b*=0.85m (0.89m) • Accurate average luminosity prediction (8x1027 cm-2 s-1) and slope projections • Beta squeeze from 1m to 0.85 m (measured 1.1 m to 0.89 m) • In-run optimization of intensity and number of bunches b*=2.6m b*=3.0m (calendar) time at store: 53% Cu-Cu ZDC cross section measured at 2.6 barn

  3. RHIC Availability and Time in Store Excellent availability (82%) despite very complex operational modes. Machine setup time reduced to 2.5 weeks. Time in store (53%) comparable to successful Au-Au Run-4 run Goal is 60% time in store

  4. Weekly Cu-Cu Luminosity and Physics Time Run5 Cu-Cu 100 GeV Delivered Integrated Luminosity by Week 101 hours/week is 60% calender time in store

  5. Turn-Around-Time (TAT) Run5 Cu-Cu (s=200 GeV) Average: 75 minutes between physics stores Blizzard Equiment failures Power dips Experiment accesses Pressure rise Permit pulls Quench link interlocks Turn-around-time: Beam dump to next declaration of physics store

  6. 5-Year RHIC Performance Nucleon-pair luminosity A1A2L delivered to PHENIX HI Luminosity exceeding design in three years

  7. RHIC HI Achieved and Planned Parameters For s=200 GeV/n Au-Au, the enhanced luminosity goal (c. 2008, before electron cooling) is Lstore ave = 8x1026 cm-2 s-1 4x design 2x achieved

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