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Run 9 Proton Polarization: Achievements and Physics Goals

This article highlights the milestones and physics goals achieved during Run 9, including polarized proton experiments and record-breaking collisions at √s = 500 GeV.

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Run 9 Proton Polarization: Achievements and Physics Goals

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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 • 28 Jun (midnight), Run 9 ends (9.9 weeks s = 200 GeV physics) , cryo warm-up begins • 30 Jun, cryo warm-up ~complete, 21.3 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. ~0.9 pb-1/day ~2.3 pb-1/day

  4. P4L~0.2 pb-1/day (or L=2.2 pb-1/day @55% pol) P4L=~0.08 pb-1/day

  5. Jet (Blue) weighted average polarization = 55.5 ± 0.7 AGS (not weighted) average 63%

  6. Jet (Yellow) weighted average polarization = 56.2 ± 0.7

  7. Plus July Running incremental demand cost to CAD ~60% of $6K/MW*20MW = $70K

  8. Archive

  9. Jet (Blue) weighted average polarization = 55.5 ± 0.7

  10. STAR Goal (w/60% pol) STAR Goal (w/55% pol) PHENIX Goal (w/65% pol) PHENIX Goal (w/55% pol) Estimated physics weeks

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