RHIC Heavy Ion Operations THE RHIC TEAM Brookhaven

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

Run-5 Cu-Cu Integrated Luminosity RHIC Run 5 Delivered s= 200 Ge. V/u Cu-Cu Luminosity b*=0. 85 m (0. 89 m) b*=2. 6 m b*=3. 0 m (calendar) time at store: 53% Cu-Cu ZDC cross section measured at 2. 6 barn § § § Accurate average luminosity prediction (8 x 1027 cm-2 s-1) and slope projections Beta squeeze from 1 m to 0. 85 m (measured 1. 1 m to 0. 89 m) In-run optimization of intensity and number of bunches

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

Weekly Cu-Cu Luminosity and Physics Time Run 5 Cu-Cu 100 Ge. V Delivered Integrated Luminosity by Week 101 hours/week is 60% calender time in store

Turn-Around-Time (TAT) Run 5 Cu-Cu ( s=200 Ge. V) 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

5 -Year RHIC Performance Nucleon-pair luminosity A 1 A 2 L delivered to PHENIX HI Luminosity exceeding design in three years

RHIC HI Achieved and Planned Parameters Mode No of bunches Ions/bunch [109] b* [m] Lstore ave [cm-2 s-1] A 1 A 2 Lstore peak [cm-2 s-1] 56 1. 0 2 2 1026 8 1030 31 1030 55 (110) 120 d/0. 7 Au 2 3 1028 6 1030 24 1030 Au-Au [Run-4] 45 1. 1 1 4 1026 16 1030 58 1030 Cu-Cu [Run-5] 36 4. 5 0. 85 80 1026 32 1030 79 1030 Au-Au enhanced 112 1. 0 1 8 1026 32 1030 124 1030 Au-Au design d-Au [Run-3] ave [cm-2 s-1] For s=200 Ge. V/n Au-Au, the enhanced luminosity goal (c. 2008, before electron cooling) is Lstore ave = 8 x 1026 cm-2 s-1 4 x design 2 x achieved