A N DY Status Commissioning with colliding beams (p +p at s=500 GeV)
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ANDY StatusCommissioning with colliding beams (p+p at s=500 GeV)
L.C.Bland, for AnDY
8 March 2011
Time Meeting, BNL
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04/20/23 2
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.
g=g0(V/V0)a
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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.
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Effect of HCal Gain Change
Before Gain Change After Gain Change
Ready for jet physics to large xF at s = 500 GeV
107 ns before trigger
107 ns after trigger
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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.
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ZDC Shower Maximum Detectorjet trigger
Blue vertical strips
Blue horizontal strips
Yellow vertical strips
Yellow horizontal strips
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ZDC SMD Events• Select events that have
Q>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.
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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)
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Issues and PlansIssues
• 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?
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Backup
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Schematic of detector for Run-11Equipment 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
• absolute energy scale via ,KS…
• Measure hadronic backgrounds to benchmark simulations
• Measure jet analyzing power (Lint~10 / pb, P=50%)
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IP2 in January, 2011Run-11 Staging of ANDY
See http://hena.lbl.gov/IP2/Business/status/<date> for pictures of progress
Left/right symmetric HCal
Left/right symmetric ECal
Left/right symmetric preshower
Trigger/DAQ electronics
Blue-facing BBC
Beryllium vacuum pipe