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RHIC Machine Status

RHIC Machine Status. Wolfram Fischer — Run Coordinator for Run-4 Gold-Gold Operation — For the C-A RHIC Team RHIC Spin Collaboration Meeting 19 March 2004. Content. Run-4 Au-Au luminosity development Low energy run preparation Summary. enhanced luminosity. design luminosity.

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RHIC Machine Status

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  1. RHIC Machine Status Wolfram Fischer — Run Coordinator for Run-4 Gold-Gold Operation — For the C-A RHIC Team RHIC Spin Collaboration Meeting19 March 2004

  2. Content • Run-4 Au-Au luminosity development • Low energy run preparation • Summary

  3. enhancedluminosity designluminosity RHIC Run-4 17 March 2003 Stores during last week, Monday to Monday 60e9 Auintensity beam experiments

  4. physics target minimumprojection maximumprojection RHIC Run-4 17 March 2003 Delivered 1196 (mb)-1 to Phenix [week ago : 1060] 136 (mb)-1 last week [best week: 158] As of 03/14/04 24:00 Star 0.9 Phobos 0.3 Brahms 0.4

  5. RHIC Time in store new target including: 11h beam exper. 10h maintenance [last month] [last month] [last month] [last month] [1st 8 weeks] [Best week withoutmaintenance: 66%] Comments: - Not all store time used by experiments (initial background, detector turn-on, etc.) - Usable store time differs from experiment to experiment

  6. RHIC Run-4 17 March 2003 • Low energy run: 31.2GeV/u total beam energy • Tested ramp without beam (Al, George, Johannes) • Thursday: test ramp with beam (10 hrs) Accelerated and stored beam, started rf re-commissioning • Wednesday 24-March, 8am: switch to low energy Need to reach production fast, only small changes after setup • 24h shifts scheduledfor 3 days • Finish ramp development • Re-commission rf storage system • Other systems (ZDC, BLM,gap cleaning, collimation) 3/8/04

  7. RHIC Run-4 Set-up for 62.4GeV/u cm energy 1st ramp to 31.2GeV/u successful M. BaiJ. van ZeijtsG. Ganetis A. Marusic

  8. RHIC Run-4 Set-up for 62.4GeV/u cm energy Beam rebucketed at lower energy M. BrennanM. Blaskiewicz

  9. RHIC Run-4 Set-up for 62.4GeV/u cm energy About 50Hz ZDC rates (gains not adjusted, 23 bunches/ring) T. SatogataJ. van Zeijts

  10. Summary • Delivered Au-Au luminosity exceed most optimistic assumptions:delivered >1200(mb)-1 to PHENIX in 11 weeks(almost the same to STAR, 1/3 to BRAHMS and PHOBOS) • Calendar time in store increased to 50% • Low energy run setup on track

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