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RHIC Status Update: Progress and Challenges in Beam Work for High Bunch Number Operation

Last week focused on raising bunch number and rebucketing progress. Key highlights include energy storage mechanics, transmission efficiency over 98%, and 65% polarization at flattop. Challenges with 109-on-109 setups noted in RHIC status update meeting. Re-commissioning LLRF planned, with AC and RF issues being addressed. Stay tuned for more updates on beam operations.

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RHIC Status Update: Progress and Challenges in Beam Work for High Bunch Number Operation

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  1. Spent most of last week raising the bunch number and setting up rebucketing • Progress of beam work • Energy and storage ramp mechanics are worked out • Transmission efficiency > 98% • Polarization ~65% at flattop • Currently working on getting through rebucketing with high bunch number • Losses with 109 on 109 pull the permit RHIC Status Update Time Meeting, V. Schoefer 2/7/12

  2. RHIC Status Update Time Meeting, V. Schoefer 2/7/12 • Speed bumps • Rebucketing setup took somewhat longer than expected • Essentially re-commissioning LLRF this year • Several trips of x-arc due to AC problem in 1000P • Cryo software and communication problem • Frequent trips of the 9 MHz RF while at store • Cavity trips due to a very fast rise in vacuum. Not explained yet • Yellow carbon polarimeters are swamped with noise after rebucketing. • Blue and yellow bunch distributions are the same

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