ANDY StatusCommissioning with colliding beams (p+p at s=500 GeV)

L.C.Bland, for AnDY22 February 2011Time Meeting, BNL

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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

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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

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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

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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