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RHIC 2010 Running Status Update: 31.2 GeV/N Preparations and Rebucketing Insights

The RHIC 2010 run is currently operating with 111x111 bunches, featuring more than 1.3e9 ions per bunch. Active rebucketing at 4.8 MV for both Yellow and Blue beams has been initiated. Peak ZDC rates exceeding 40 kHz have been observed. Stochastic cooling is ongoing, and a vacuum spike has affected the Blue beam. Preparations for 31.2 GeV/N run are in place, with a focus on injection and RF setup. Detailed timelines and shifter schedules have been established to facilitate efficient operations and collisional setups.

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RHIC 2010 Running Status Update: 31.2 GeV/N Preparations and Rebucketing Insights

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  1. Run 10 Status http://www.cadops.bnl.gov/AP/RHIC2010/ http://www.cadops.bnl.gov/AP/RHIC2010/

  2. Status • Running with 111x111, >1.3e9 ions/bunch • With rebucketing, 4.8 MV in Yellow, 4.8 MV Blue • ZDC rates >40kHz peak • Stochastic Cooling status • Vacuum spiked at Blue Longitudinal , BL now off • Transverse cooling alternating, Blue / Yellow • Rebucketing & ZDC rates • Latest store, try 4.6 MV (600 kV on “colored” cavities, 700 kV on common cavities.)

  3. Run 1062.4 GeV Setup

  4. 19.5 GeV/N 31.2 GeV/N

  5. Preparations • 2 days for setup (hopefully less) • Shift schedule is posted • storage rf system can be used above 19.5 GeV/nucleon • We will use it for the 31.2 GeV run • (We may be able to use it for the 19.5 GeV run) • Expect to work on rebucketing the evening on 1st day • Beta* ~ 2.5m, all crossing angles are 0. • Basic configuration is same at injection through transition • Develop checklists for energy change

  6. Basic Plan • Injection doesn’t change • RF setup at injection (synchro) remains the same • Ramp changes slightly even before transition • Keep gamma jumps as they are (time changes slightly) • Beta-squeeze after transition changes • Yellow dipole feedback – timing will change • Brho loop timing will change • Use tune/coupling and orbit feedback for ramp – 3 ramps • Rebucketing setup = 1 shift (new frequency, new phases) • Collimation and orbit setup

  7. Schedule: • Thurs. March 18 • 8 am: end 200 GeV run • Switch to new ramp (modify scripts/sequences) • Check timing – brho loop, loss mons., yellow dipole feedback • Run 6x6 bunch ramp with tune/coupling and orbit feedback including data-stores for p.s. group • Do second 6x6 bunch ramp with feedback w/ data-stores • Run feed-forward ramp and tune ramp efficiencies • 4 pm: setup rebucketing and collisions • Once rebucketing is working, work on store setup (scale IR corrections and check) • Fri. March 19 • continue collimation setup, store orbits • Start raising number of bunches • Physics by evening

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