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RHIC Status

RHIC Status. RHIC Spin Collaboration V. Schoefer 2/10/12. Startup Summary. 1/21: Blue injection 1/24: 9 MHz ARC EVENT 1.5 Shifts of beam lost 1/25: Circulating beam and operational instrumentation reach very quickly. Great improvement in global timing setup.

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RHIC Status

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  1. RHIC Status RHIC Spin Collaboration V. Schoefer 2/10/12

  2. Startup Summary • 1/21: Blue injection • 1/24: 9 MHz ARC EVENT • 1.5 Shifts of beam lost • 1/25: • Circulating beam and operational instrumentation reach very quickly. Great improvement in global timing setup. • LLRF capture in both rings ahead of schedule • 1/27: Power supplies ready for 100 GeV • 1/29: LLRF ready for ramps • Blue beam to flattop in one ramp • 1/30: • Both beams to flattop on fourth attempt • 1/31-2/2 • Ramp setup, 9 MHz vacuum pulls begin • 2/2-2/4 • Rebucketing setup: Longer than expected • 2/5-2/7 • Intensity ramp up • 2/8 • Beam conditioning of 9 MHz vacuum, no trips since then • Able to increase bunch number after this • 2/9-2/10 • Bunch number increase, regular stores

  3. Current Status • Successful rebucketed store at 96x96, 1.1e11 (injected) • Vernier scan planned soon to measure cross section • Problems • BBQ system for tune feedback is locking across rings (yellow system measures blue vertical tune) • Responsible for many lost fills last night • Polarimeter sees noise • Associated with the 197 MHz storage cavities

  4. Horizontal tunes Vertical tunes Blue Yellow

  5. Agreement down to the noise Separating the tunes on the ramp a small amount seems to work as a stopgap

  6. Polarization lifetime Horizontal store tunes are drifting high during the store toward 0.7 spin resonance Will adjust incrementally

  7. Plan • Run continuously for the weekend • Vernier scan at end of store • Some beam development left for day shift next week (Monday, 1-2 dedicated low intensity ramps) • Beta* measurements • Linear optics

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