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RHIC Run-7 Au-Au Operation

RHIC Run-7 Au-Au Operation. Run organization Previous run and expectation for Run7 Start-Up plan Problem areas. A. Drees APEX workshop, Nov 2 nd 2006. RHIC Run organization. Run Coordinator HI Angelika Drees

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RHIC Run-7 Au-Au Operation

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  1. RHIC Run-7 Au-Au Operation • Run organization • Previous run and expectation for Run7 • Start-Up plan • Problem areas A. Drees APEX workshop, Nov 2nd 2006

  2. RHIC Run organization • Run Coordinator HI Angelika Drees • Run Coordinator PP/other Christoph Montag • Scheduling physicist Kip Gardner • RHIC shift leaders: Bai, Drees, Luo, Montag, Ptitsyn, Kewisch, Zhang, Beebee-Wang, McKay, Satogata • Back-up RHIC shift leaders: Fischer, Montag/Drees, Trbojevic, Pilat • Trainees: Dmitry, Alexei, Guillaume, Eduard • Operations + RHIC specialist (Marr) larger role during set-up, ramp-up, beam-ex Weekly schedule (no maior changes) Monday Scheduling meeting Monday RHIC Weekly meeting Tuesday Time Meeting & Machine-experiments meeting operations analysis meeting (new) varying/Wednesday Beam Experiments Wednesday maintenance day (bi-weekly) daily/varying RHIC run meeting (will have to change time slightly: 9:00 am)

  3. Run 7 Draft Schedule • dry run Nov. 15-17 • RHIC cool down begins Dec. 1 • assume 30 cryo-weeks • assume two mode running: HI + other (d-Au, pp, …) • HI could include low energy run • 1st beam in RHIC (blue) Dec. 8 • set-up in cool-down mode: 10 days • ramp and store development: 1 1/2 weeks • ramp up: 1 week • 12 weeks of physics basic parameters: • 2 experiments • tunes 0.22/0.23 • Brho ~81 Tm • b*: 0.85, 0.85, 5, 7, 5, 5

  4. Expected Luminosity for HI • No. of bunches: likely to increase gradually during the run, maybe up to 111 • ions/bunch: 1.1 109 achieved => we could probably get 1.3-1.5 109 from injectors • transition crossing • vacuum/pressure rise • b*: squeeze to 0.85 m (=> background, collimators …) • time in store: how can we reach 60%? Automation, QLI reduction, PS reliability, weather … • bunched intensity, vertex: stochastic cooling • stochastic cooling: yellow only (blue in testing), will not yet reduce vertex distribution significantly but increase yellow bunched lifetime, 10% L increase?

  5. RHIC Run-4 – Au-Au operation Major achievements Au-Au: • Start-up/ramp-up in 4 weeks (1 week less than planned) • Consistent high bunch intensity from injector(109Au) • Time in store increased to 53% (65% at 31.2GeV/u) • Reliable, almost complete rebucketing into storage rf • Steering and collimator setting time reduced to 10min • Best 7 days delivered 179 μb-1 to Phenix (2x Run-2) • Set-up for 31.2GeV/u run in less than 2 days from W.Fischer, Retreat 04

  6. 60e9 Auintensity, with 45 bunches only! Beam experiments enhancedluminosity designluminosity RHIC Run-4 record week Week 9 Feb to 17 Feb[66% of calendar time in store]=> so we’ve done it before ;) f. W. Fischer, retreat 04

  7. Run4 Emittances and Luminosities (Initial)

  8. Run-7 upgrades/improvements Booster/AGS bunch merge => Brennan, Gardner yellow only work in progress

  9. Cool-Down mode … followed by ramp- and store setup and ramp up intensity (3 weeks total) add some hours to check polarity of re-cabled sextupoles with beam in principle blue could ramp before yellow is ready. begin testing chromaticity measurements/feedback at injection

  10. Gap Cleaning Efficiency • existing data cannot determine 1st or 2nd order • extrapolation allows 1.4 109 ions/bunch with current gap cleaner and debunching rate • no IBS suppression assumed • no cooling • assume a store length of 4 hours before limit of debunched beam is reached • improve gap cleaner? • is in progress • software changes • duty cycle x 10 (looks good so far) • 1.4 109 ions/bunch can probably reached by injectors/tandem

  11. Run-7: ramp, set-up and efficiency • More automation: • Steering small changes compared to run4 • Collimation(small SW changes compared to run4) • Ramp & store orbit correction improved(time saving: machine became reproducible over whole run, can eliminate luminosity optimization, also saves time when exp. magnet configuration is changed) • Gap Cleaning: continuous during the store (no change), good up to 1.4 109 ions/bunch • Automate/Sequence all of the above • ongoing operations analysis meetings throughout the run • Configuration database • Instrumentation: BBQ, tune feedback, BTFs, de-coupling on the ramp

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