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

This document provides updates on the commissioning progress of the ANDY experiment using colliding beams at a center-of-mass energy of 500 GeV. It includes information on triggers, gain matching, gain factors, and future plans.

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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 22 February 2011 Time Meeting, BNL

  2. HCal Events • Cosmic ray trigger is essentially the same as jet trigger, except that the threshold on the summed calorimeter response is set at 5 pC (20 counts) • This is a trigger that will work without beam. We have other cosmic-ray triggers that will work with beam, when commissioned, for continuous monitoring. • The tracks test noise, patterns, etc. • From last week… • Select from jet-trigger events for HCal “high-tower” to be centered in module • Display for each detector of each module the ADC count as color scale (black=greatest count yellow=lowest count) • Events look “jetty”, as expected

  3. ECal Gain Matching • Use neutral-pion reconstruction for online gain matching. • Determine software gain factors from p0 reconstruction, to get mass peaks near physical mass for all detectors. • Measure gain curves for each PMT, using LED and varying applied voltage. • Combine software gain factors and gain curves to predict new HV. • So far, one iteration has been completed. column 1: closest to beam

  4. Issues and Plansfor next access possibility and beyond • Resolve a few remaining single-channel issues • Reduce HCal gain – limited scheduled access time last Wednesday did not allow completion of HCal gain reduction. • We are in “production” with a jet trigger >100M jet events recorded. • Last three stores had smooth IP2 bump removals • In coming week… • Increase DAQ rate (multiple tokens) • Complete ECal gain matching • ECal trigger development

  5. Backup

  6. 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%)

  7. 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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