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Machine status

Machine status. Status - overview. Tue Jan 4 beginning”2 weeks” ramp-up Tue Jan 11 beginning of phyisics (eve) Tue Jan 18 < 1 week into physics (data up to Monday morning 5:30am). Total from January 11 (nbarn-1) Phenix: 1.38 STAR: 1.38 Brahms: 0.64 Phobos: 0.52.

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Machine status

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  1. Machine status

  2. Status - overview Tue Jan 4 beginning”2 weeks” ramp-up Tue Jan 11beginning of phyisics (eve) Tue Jan 18 <1 week into physics (data up to Monday morning 5:30am) Total from January 11 (nbarn-1) Phenix: 1.38 STAR: 1.38 Brahms: 0.64 Phobos: 0.52

  3. Intensity/collisions – Week 1 best 45 43 34 37 37 31 access 28 28 28 28 28 28 37

  4. Week 1 – best store (31x31 4.5e9) 5904 – Sunday afternoon

  5. Operations issues • Rates Phenix/Star, Phobos/Brahms (procedure for phenix steering) • Reduce time between stores data, revisitoptimum store lengths? • Gap cleaning (no cleaning or cleaning • Nominal intensity – reproducibility (better with AGS, and low intensity interlock) • Transmission – reproducibility (auto-orbit correction, + regular re-tuning on ramp) • Ramp check/maintenance every morning (by day shift leader) • Use of configuration page

  6. Luminosity development Ramp/store parameters now: 37x37 4.5 e9 limitations Pressure rises • Phobos PR with 43x43 • transition pressure rise atwarm section 4 o’clock with 45x45 Losses at transition Transverse Emittance Background  not yet Beam-beam  not yet Luminosity development • Increase bunch intensity 4.56-7e9 Transition optimization for bunch intensity>4.5e9 Emittance measurement, control (injectors, emittance growth RHIC) • Re-try Increase number of bunches to 45-55 • IR correction, yellow • Common cavities • Test of different working point (ramp/store)

  7. Back from access Monday-Tuesday - many problems • AGS main magnet and PS • ODH alarms • Repeated quenches • RF cavity tuner failures ………..impact on luminosity clear Recover from access owl today: • Support to operation (Greg, Todd…) • Ramp maintenance (transmission) • Revert to ramp/store 5904(Sunday- Phobos B)

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