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PHENIX flying into new era

PHENIX flying into new era. Stefan Bathe, Time Meeting, April 27, 2010. Beam Clock Fixed. Beam clock fixed last night! Thanks to: Tom Hayes, Freddy Severino , Rob Michnoff , Kevin Smith, Joe Mead, Jack Fried, Todd Satogata , our own John Haggerty, and others . . .

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PHENIX flying into new era

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  1. PHENIX flying into new era Stefan Bathe, Time Meeting, April 27, 2010

  2. Beam Clock Fixed Beam clock fixed last night! Thanks to: Tom Hayes, Freddy Severino, Rob Michnoff, Kevin Smith, Joe Mead, Jack Fried, Todd Satogata, our own John Haggerty, and others . . . Lumi increase by factor 3! 600 K events in 4 weeks seem reachable New slope: 150 K mbias events/week 21.4 K/day 0.25 Hz Stefan Bathe

  3. PHENIX BBCLL1 rate [Hz] vs. time [min.] PHENIX BBCLL1 (2 Hz bckgrd from laser subtracted) 100% clean 90% efficient counts at all times 2-3 Hz in beginning of storezvtx within +/- 30 cm  rate(t=0) = 2.5 Hz component 1: fraction=88.5%, t1/2=2.5min component 2: fraction=11.5%, t1/2=25.7 min Stefan Bathe

  4. Optimum Store Length Assumption: 8 min. between stores 6min. store length = 50 % luminosity gain 0.5 Hz rate roughly consistent with actually recorded events Factor 3 increase also consistent Continuous running Having to switch clocks (4 min. loss) Stefan Bathe

  5. Data Validation I Data In central events: BBC charge NOT close to zero = No inefficiency for central events UrQMD + frammentation afterburner Data and simulation agree  physics triggers Stefan Bathe

  6. Event Validation II Looks as expected Stefan Bathe

  7. Event Validation III Looks as expected Mean BBC time in ns Stefan Bathe

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