a n dy status commissioning with colliding beams (p +p at s=500 gev) l.c.bland, for andy 22...
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ANDY StatusCommissioning with colliding beams (p+p at s=500 GeV)
L.C.Bland, for AnDY22 February 2011Time Meeting, BNL
05/08/23 2
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
• 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.
HCal Events
05/08/23 3
ECal Gain Matching• Use neutral-pion reconstruction
for online gain matching.
• Determine software gain factors from 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
05/08/23 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 removalsIn coming week…
• Increase DAQ rate (multiple tokens)
• Complete ECal gain matching
• ECal trigger development
05/08/23 5
Backup
05/08/23 6
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%)
05/08/23 7
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
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