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RHIC Run 9: Polarized Proton Physics Achievements

A summary of the RHIC Run 9 timeline and key milestones, including the cool down, beam injection, ramp development, and successful collisions at sqrt(s) = 500 GeV. Also, highlights of the physics goals achieved in terms of luminosity and polarization for PHENIX and STAR experiments.

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RHIC Run 9: Polarized Proton Physics Achievements

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  1. Run 9 polarized proton Log • 9 Jan begin 45 degree cool down from room temp (3 MW-NEW) • 2 Feb, Cool-down to 4.5 degrees begins • 5 Feb, Blue ring cold but still stabilizing • 7 Feb, beam injected into Blue ring, • 8 Feb, Yellow cold but still stabilizing • 9 Feb, 2 week “Setup” mode begins(0.5 weeks early) • 13 Feb, Beam injected into Yellow ring • 14 Feb, STAR magnet on, ramp development begins • 17 Feb Nov, First collisions @ s = 500 GeV (2.3 weeks into run – a record!) • 24 Feb, “Ramp-Up” mode begins, overnight stores for experiments • 6 Mar, Machine in “Physics” mode, integrated lumi begins • 16 Mar, Spin rotator ramps established, longitudal polarization available • 17 Mar Experiments in Physics mode • 13 April (1200), end s = 500 GeV physics (3.9 weeks), begin last s = 500 GeV beam development followed by new low level RF setup • 15 April (0800), Maintenance and s = 200 GeV ramp setup • 15 April (2100), begin setup with beam for s = 200 GeV • 20 April (2341), s = 200 GeV physics begins (8 days early) with further ramp-up • 21 April (1802), PHENIX physics begins • 23 April , STAR physics begins • 29 June (0800), end s = 200 GeV main physics run (10 weeks) • 29 June (0800), setup for pp2pp at STAR run begins, PHENIX remains on • 30 June (0009), pp2pp Physics on but beam tune-up continues • 4 July (1000), pp2pp ends (0.6 weeks), beam studies at s = 500 GeV begin • 6 July (1000), RHIC beam studies end, cryo warmup begins • 8 Jul, cryo warm-up ~complete, 22.3 weeks cryo operation

  2. Run 9 s = 200 GeV Physics Goals • PHENIX (revised 5/19/09) • 65 pb-1 delivered, ~25 pb-1 recorded • 60% polarization, quality factor is P4L • FOM = 65 x (0.60)4 = 8.4 pb-1 delivered • STAR • 100 pb-1 delivered, ~50 pb-1 recorded • ~60% polarization, quality factor is P4L • FOM = 100 x (0.6)4 = 13 pb-1 delivered

  3. ~2.3 pb-1/day ~1.1 pb-1/day

  4. Blue Jet weighted average = 55.4 ± 0.5 Yellow Jet weighted average = 54.9 ± 0.5

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