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ANDY Status - Commissioning with Colliding Beams (p+p at √s=500 GeV)

This document provides an overview of the commissioning status of the AnDY project with colliding beams, highlighting achievements, issues, and plans for future access. Detailed information on triggers, detectors, energy scale determination, and upcoming tasks is included.

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ANDY Status - Commissioning with Colliding Beams (p+p at √s=500 GeV)

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  1. ANDY StatusCommissioning with colliding beams (p+p at s=500 GeV) L.C.Bland, for AnDY 8 February 2011 Time Meeting, BNL

  2. 1 MIP 2 MIP Minimum Bias (MB) Trigger • AnDY beam-beam counter uses former paddle counters from PHOBOS • Minimum-ionizing particle (MIP) peaks used for first-pass gain matching • MB = (SQB > Q0)(SQY > Q0)

  3. Hit TimingMB Collision Triggerrecovered after 20110202 access No timing cut • “reversed logic” issue reported last week fixed during access • Hit timing measurements now in data • Collision trigger = (MB)  (DT1<DT<DT2) commissioned on 20110205 • Subsequent to this commissioning, we are in collision-trigger “production” until next access where some remaining issues will be resolved Yellow backgnd Collisions Blue backgnd With timing cut

  4. Increasing row  Increasing column/distance from beam  Hadron Calorimeteras seen by collision trigger • Uses relative gain matching from cosmic-ray m events • Still need to trigger on LED to establish if optics is unaffected by final placement of HCal • Energy scale still to be determined • Work on HCal trigger has begun

  5. Issues and Plansfor next access possibility and beyond • Resolve a few remaining single-channel issues • Set up measurement of live time • We are in “production” now for minimum bias with >50M events recorded so far. • Following access, in coming week… • Begin ECal final calibration • Commission additional triggers

  6. Backup

  7. Schematic of detector for Run-11 • Equipment in place: • HCal is two existing 9x12 modules from E864 (NIM406,227) • ECal are two small lead-glass modules from BigCal at JLab • BBC (from PHOBOS) and ZDC • Preshower is newly constructed scintillator arrays • Goals: • Establish impact of 3IR operation on PHENIX/STAR luminosity • Calibrate HCal • relative gain via cosmic-ray m • absolute energy scale via r,L,KS… • Measure hadronic backgrounds to benchmark simulations • Measure jet analyzing power (Lint~10 / pb, P=50%)

  8. Trigger/DAQ electronics Left/right symmetric HCal Left/right symmetric ECal Blue-facing BBC Left/right symmetric preshower Beryllium vacuum pipe IP2 in January, 2011Run-11 Staging of ANDY See http://hena.lbl.gov/IP2/Business/status/<date> for pictures of progress

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