A n dy status commissioning with colliding beams p p at s 500 gev
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A N DY Status Commissioning with colliding beams (p  +p  at s=500 GeV). L.C.Bland, for AnDY 12 April 2011 Time Meeting, BNL. Local Polarimetry Event data analysis to tune parameters for scaler board.

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A N DY Status Commissioning with colliding beams (p  +p  at s=500 GeV)

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A n dy status commissioning with colliding beams p p at s 500 gev

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

L.C.Bland, for AnDY

12 April 2011

Time Meeting, BNL

Local polarimetry event data analysis to tune parameters for scaler board

Local PolarimetryEvent data analysis to tune parameters for scaler board

  • Events that pass a ZDC trigger (Blue-facing OR Yellow-facing) are analyzed. Similar information is available on scaler board (acquiring data at 9.38 MHz), although final tuning is required.

  • Uses ZDC shower maximum detector to reconstruct azimuth (f) for event. f is spin sorted, based on 7-bit bunch counter and polarization pattern.

  • N±(f) and N±(f+p) are combined in a cross ratio analysis and then fit by esin(f-f0).

Higher intensity for ip2 collisions

Minimal impact on STAR,PHENIX

Higher Intensity for IP2 Collisions

Fri. 8 April


IP2 collisions have begun <3 hours after physics ON

Integrated luminosity estimate to date

Integrated Luminosity Estimate to Date

~2mr crossing angle

~1.6mr crossing angle

~0mr crossing angle

systematically increased thresholds for IP2 collisions

  • Presently, no accidentals correction (found to be large for ZDC). All rates are now scaled on bunch-crossing scalers, following 20110330 access and subsequent timing adjustments.

  • 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)

Many thanks to C-A for increasing the threshold for IP2 collisions



Issues and plans

Issues and Plans

  • We are in “production” with a jet trigger >660M jet events recorded.

  • Further increase per bunch intensity for IP2 bump removal? Present criteria couples IP2 collision start with CNI measurement  move CNI measurement earlier?

  • Vernier scan at IP2?

  • Reduce IP2 b* during APEX?

  • Demonstrate reproducibility

  • Complete ECal gain matching Not much progress in past week.

  • Begin local polarimetry production. Scaler board and FPGA configurations in production. Final tuning required







Reminder of goals long term and run 11

Reminder of GoalsLong-term and run-11

  • Goals of ANDY project:

  • Establish that large-xF low-mass dileptons from the Drell-Yan process can be discriminated from background in s=500 GeV p+p collisions

  • Measure the analyzing power for Drell-Yan production with sufficient statistical precision to test the theoretical prediction of a sign change for DY in relation to semi-inclusive deep inelastic scattering

  • Establish if robust detection of Drell-Yan dileptons at large xF and low mass requires magnetic analysis  critical for future facilities at RHIC



A n dy priorities for remainder of rhic run 11

ANDY Prioritiesfor remainder of RHIC run-11

  • Run-11 goals:

  • Establish the impact of a third IR on RHIC performance for p+p collisions at s=500 GeV - Demonstrate luminosity at IP2, as required for Drell-Yan sample in runs 12 (without magnet),13 (with magnet). Estimate that 150 / pb gives 104 large-rapidity di-electrons with M>4 GeV/c2 for p+p at s=500 GeV. Is this possible in a 10-week run?

  • Demonstrate calibration of HCal

  • Measure analyzing power for large xF jet production. Non-zero AN required for jets if Drell-Yan production has an analyzing power. Complete the measurement of the analyzing power for jet production. A non-zero AN for jets is a requirement for Drell-Yan to have non-zero analyzing power. Recent theoretical work establishes intrinsic interest in the jet analyzing power measurement.



Run11 a n jet

Run11 AN(Jet)

arXiv:1103.1591 jet AN measurements are required to clarify signs of quark/gluon correlators related to Sivers functions.


s=200 GeV

from p+pp

“new” Sivers function

“old” Sivers function


Non-zero jet analyzing power essentially a prerequisite before proceeding to Drell Yan


  • Siver’s effect only (no collin’s effect contribution)

  • Need AN(Jet) measurements before DY

  • With ~10/pb & P=50%, AnDY run11 can measure AN(Jet)




  • At present threshold for IP2 collisions (average intensity < 0.901011/bunch), integrate ~200 / nb / fill

  • 2 fills/day has been achieved

  • Consequently, 12.5 days are required to get 5 / pb

  • Maximum possible integrated luminosity (IP2 collisions for entire fill) would yield ~700 nb/fill

    • One week at 2 fills/day would provide 5 / pb

    • Two weeks at 2 fills/day would provide 10 / pb

Schematic of detector for run 11

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%)



Ip2 in january 2011 run 11 staging of a n dy

Trigger/DAQ electronics

Left/right symmetric HCal

Left/right symmetric


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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