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

L.C.Bland, for AnDY1 February 2011Time Meeting, BNL

04/22/23 2

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%)

04/22/23 3

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

04/22/23 4

Commissioning• First data recorded on Weds. 26 January after fixing MVME 2306 and FPGA board (DSM)

• Timed-in beam-beam counter, ECal and HCal phototube signals to ADC

• Commissioned minimum-bias trigger

• Further commissioning on Thurs. 27 January

• HV scan of BBC for gain adjustments

• Align data pipeline timing for ZDC

• Timed-in ZDC, ZDC shower-maximum detector and preshower signals to ADC

• Further commissioning on Sun. 30 January

• Identify reversed logic issue for time-to-amplitude converters (partially fixed on 31 Jan 15-minute access)

• Commission elog, database recording

So far, no impact of collisions at IP2 on IP6,8

04/22/23 5

Event ReconstructionReconstruct 200K minimum-bias events as seen in beam-left ECal via

• Clustering

• Shower-shape analysis

50 MeV/count for all detectors

Fixed vertex position used (TAC issue)

Epair>12 GeV, |E1-E2|/Epair < 0.8

Neutral pion reconstruction from ECal will be part of HCal calibration

Reconstructions concurrent with data acquisition provide critical feedback to experiment

04/22/23 6

Issuesshould be resolved during 20110202 access

• Recover event hit-timing information from BBC detectors

• Single-channel issues

• Increase monitoring feedback to MCR

• … and a long list of small tasks

• After access,

• adjust gains for ECal and selected HCal (mostly good from cosmic-rays)

• start commissioning triggers on HCal, ECal and ZDC

We are ~1 week from physics-quality data