A N DY Status Commissioning with colliding beams (p  +p  at s=500 GeV)

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

2. g=g0(V/V0)a Gain Monitoring for Hadron Calorimeter • Fast current pulser (from Berkeley) and Blue Nichia light-emitting diodes (LED) drive fiber optics to distribute fast light pulses to individual detectors. • Used LED system to measure gain curves from each HCal PMT prior to start of run 11. • Use LED system as continuous gain monitor for cosmic rays and collisions.

3. HCal Gain ChangeDuring 20110302 Access • Gain adjustment to enable jet physics to large xF at s=500 GeV • Choose target to be 60% of gain used for day<11061 jet trigger. • Used measured gain curves for each PMT. • Confirmed gain change with LED system.

4. 107 ns before trigger 107 ns after trigger Before Gain Change After Gain Change Effect of HCal Gain Change  Ready for jet physics to large xF at s = 500 GeV

5. ZDC Response • ZDC response (summed over three modules) to different triggers shows interesting biases. • ZDC trigger is still required to be commissioned for local polarimetry • ZDC shower maximum detector is mostly in working order.

6. ZDC Shower Maximum Detectorjet trigger Blue vertical strips Blue horizontal strips Yellow vertical strips Yellow horizontal strips

7. ZDC SMD Events • Select events that have SQ>250 and Q2>10 (middle module) for Yellow-facing ZDC • Make event display by having vertical axis correspond to ADC value and horizontal axis correspond to detector ID. • Showers look reasonable; double checks of mapping still required • Next step is to trigger on ZDC for local polarimetry, using bunch counter to distinguish single-beam backgrounds from collisions.

8. Integrated Luminosity Estimate to Date • Presently, no accidentals correction (found to be large for ZDC). Singles rates from BBC are now scaled, following 20110302 access. • Requires calibration of effective cross section for BBC via vernier scan. • Jet analyzing power measurement sets goal of 10 / pb for run 11. • Establishing luminosity capability in run 11 is important for Drell Yan attempt in runs 12,13 (150 / pb in each run)

9. Issues and Plans • Issues • Resolve a few remaining single-channel issues • We are in “production” with a jet trigger >250M jet events recorded. • In coming week… • Complete ECal gain matching • Commission ZDC trigger for local polarimetry. • Commission scaler system for local polarimetry. • Increase per bunch intensity for IP2 bump removal? • Remove beam crossing angle at IP2?

10. Backup

11. 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%)

12. 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