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PHENIX Status Update on Accumulated Luminosity and Particle Production - May 11, 2010

This report summarizes the accumulated luminosity and performance of the PHENIX experiment as of May 11, 2010. Key highlights include a significant increase in luminosity, with rates achieved twice as high due to enhanced beam intensity. The meeting, led by Stefan Bathe, discussed the efficiency and cleanliness of the BBCLL1 triggers, reporting a 70% efficiency with clean counts. Additionally, the relationship between charge multiplicity and pseudorapidity was examined, showing nearly perfect alignment with UrQMD data. The current store length and operational parameters were also covered.

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PHENIX Status Update on Accumulated Luminosity and Particle Production - May 11, 2010

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  1. PHENIX Status @ 7.7 GeV Stefan Bathe, Time Meeting, May 11, 2010

  2. Accumulated luminosity BBCLL1(>1 tubes) 2nd attempt at 6 m beta* also caused high background rate As of Sunday morning, luminosity twice higher than before due to higher intensity 450 K minimum bias events recordedto date 1Hz in store average 0.7 Hz all-time average 470K mbiasevts/week 1.1Mevents in 4 weeks Stefan Bathe

  3. Time Dependence PHENIX BBCLL1(>1 tubes) +/- 30 cm vtx cut (2 Hz laser rate subtracted) very clean ~70% efficient counts at all times 3-4 Hz in beginning of store rate(t=0) = 3.5Hz component 1: fraction=24%, t1/2=1.15min component 2: fraction=76%, t1/2=6.4 min rate [Hz] t [min.] Significant lifetime improvement since last week Stefan Bathe

  4. Optimum Store Length Current store length: 15 minutes Assumptions: - 4 min. between stores (dump to peak) - Counted only from peak on 6min. store length = 30 % luminosity gain Typically 1Hz average rate while in store average rate [Hz] optimum store length: 6minutes t [s] Stefan Bathe

  5. BBC Charge vs. h=0 Multiplicity Almost PERFECT agreement with UrQMD DATA UrQMD from Jeff Mitchell Stefan Bathe

  6. Pseudorapidity dependence of particle production from Kotaro Kijima Stefan Bathe

  7. Cleanliness of BBCLL1(>1 tubes) trigger • BBCLL1 singles triggers (North, South separately) fire at 10s of Hzno random coincidences • BBCLL1 coincidence trigger fires at ~0.004 Hz with just one beam in the machine (<0.5 % of collision rate) Stefan Bathe

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