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EMCal-RICH level1 trigger performance at PHENIX

EMCal-RICH level1 trigger performance at PHENIX. Kensuke Okada (RIKEN Wako, Saitama, Japan) for the PHENIX collaboration. EMCal-RICH trigger. Trigger for high pT  s h  s electrons. Physics. G from A LL (of direct g ,  0 2 g , h  )

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EMCal-RICH level1 trigger performance at PHENIX

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  1. EMCal-RICH level1 trigger performance at PHENIX Kensuke Okada (RIKEN Wako, Saitama, Japan) for the PHENIX collaboration Kensuke Okada (RIKEN)

  2. EMCal-RICH trigger Trigger for high pT s hs electrons Physics • G from ALL (of direct g, 0 2g,h) • q/q with W production asymmetry (Wen) • G from charm production asymmetry(charmenX) • pQCD test through AN(0 2g,h) • Comparison data for Heavy Ion collision (0 2g,h ,J/y ee) pp run in run2 (’01Dec~’02Jan) Rejection power requirement in run2 averaged trigger rate : ~20kHz (max 75kHz) DAQ bandwidth : ~1kHz (200Hz assigned to this trigger) factor 100 was needed Kensuke Okada (RIKEN)

  3. EMCal EMCal RICH RICH h PHENIX central arm 2 types of EMCal (PbSc, PbGl) (0) Concept of EMCal-RICH trigger (0) : EMCal Electron : EMCal and RICH h : EMCal and RICH (through hadronic interactions) Kensuke Okada (RIKEN)

  4. PMT 2x2 4x4 overlap EMCal trigger Threshold 2x2 4x4a 4x4b 4x4c : not used in this run EMCal tower 5.25*5.25cm(PbSc) 4*4cm (PbGl) Total 15552 towers (PbSc) and 9216 towers (PbGl) Kensuke Okada (RIKEN)

  5. Trigger Performance Check • Turn on curve (important for the rejection power) • Live ratio Kensuke Okada (RIKEN)

  6. Trigger Turn On Curve GeV/tile • Turn on width comes from 2 places. • PMT gain variation • Trigger circuit Kensuke Okada (RIKEN)

  7. EMCal PMT gain variance PbSc PbGl 11% 18% PbGl has better shape than PbSc. Both of them have some very off gain PMT. (Some of them were not used in the last plots as a offline mask) Kensuke Okada (RIKEN)

  8. PbGl 2x2 PbSc 2x2 14% 13% Min bias Min bias PbGl 4x4a PbSc 4x4a 29% 29% 2x2 trig event 2x2 trig event PbGl 4x4b PbSc 4x4b 2x2 trig event 2x2 trig event 24% 23% [ADC/tile] Trigger turn on curve for ADC value To reject gain variance effect. Only circuit “noise” appears. Comparable to the gain variance (=11% and 18%) Dominant source of turn on curve Dominant source of turn on curve Kensuke Okada (RIKEN)

  9. 4x4 2x2 rejection power threshold[GeV/tile] Rejection Power of EMCal Trigger compared to the MC simulation with sharp turn on. 4x4 has low rejection power than expectation because of wide turn on curve. Kensuke Okada (RIKEN)

  10. Live Ratio Dead area mainly came from hot channel mask Unit= super module (SM) PbSc PbSc PbGl PbSc ~75% is alive Need to be investigated for RUN3. Kensuke Okada (RIKEN)

  11. EMCal trigger + Edep cut min-bias pT[GeV/c] • Mass(ee) Profits in Various Channels from EMCal 2x2 trigger ~40nb-1 p0 (g) J/y (e) EMCal trigger h Kensuke Okada (RIKEN)

  12. efficiency #photo electrons / tile RICH trigger Structure 4x5 PMT is the unit. total 256 tiles. Turn on curve Live ratio 38tiles (14.8%) in run2 Bad parts are already fixed for RUN3 Kensuke Okada (RIKEN)

  13. Summary EMCal-RICH trigger was newly installed at PHENIX RUN2. EMCal trigger ~75% worked properly Turn on curve width came from PMT gain variance and trigger circuit. Statistical gain of p0, h, J/y RICH trigger ~15% of RICH trigger units worked properly. • For the next run (RUN3 January,2003) : • Luminosity : ~20 RUN2 • DAQ ability : ~5 • We will be in severer condition. • raise the live ratio • EMCal-RICH coincidence • reduce the turn on width Kensuke Okada (RIKEN)

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