ANDYRHIC Run-12 Status/Proposed Goals

L.C. Bland, BNL

RHIC Spin Collaboration

13 Jan 2012

13 Jan 2012 2

E.C.Aschenauer, A. Bazilevsky, L.C. Bland, K. Drees, C. Folz, Y. Makdisi, A. Ogawa, P. Pile, T.G. Throwe

Brookhaven National LaboratoryH.J. Crawford, J.M. Engelage, E.G. Judd

University of. California, Berkeley/Space Sciences LaboratoryC.W. Perkins

University of. California, Berkeley/Space Sciences Laboratory /Stony Brook University

A. Derevshchikov, N. Minaev, D. Morozov, L.V. NogachInstitute for High Energy Physics, Protvino

G. IgoUniversity of California, Los Angeles

M.X. LiuLos Alamos National Laboratory

H. AvakianThomas Jefferson National Accelerator Facility

E.J.BrashChristopher Newport University and TJNAF

C.F.PerdrisatCollege of William and Mary

V. PunjabiNorfolk State University

Li, XuanShandong University, China

Mirko Planinic, Goran Simatovic University of Zagreb, Croatia

A. VossenIndiana University

G. SchnellUniversity of the Basque Country and IKERBASQUE,Spain

A. Shahinyan, S. AbrahamyanYerevan Physics Institute K. Gnovo, N. K. Liyanage

University of VirginiaE. Cisbani

INFN Roma, Italy

ANDY

“Large Rapidity Drell Yan Production at RHIC”

Letter of Intent submitted 24 May 2010:

http://www.bnl.gov/npp/docs/pac0610/Crawford_LoI.100524.v1.pdf

PAC presentation: http://www.bnl.gov/npp/docs/pac0610/aschenauer_DY-collider_june10.pdf

Proposal to 2011 PAC:http://www.bnl.gov/npp/docs/pac0611/DY_pro_110516_final.2.pdf

Construction Proposal Nearing Completion

JLab-SBS GEM experts

13 Jan 2012 3

Goal of ANDY ProjectMeasure the analyzing power for forward Drell-Yan production to test the predicted change in sign from semi-inclusive deep inelastic scattering to DY associated with the Sivers function

Projected precision for proposed ANDY apparatusGEANT model of proposed ANDY apparatus (run-13)

13 Jan 2012 4

Present Status• Construction proposal estimated completion is middle of January

• Minimal changes made to run-11 apparatus

o HCal annulus (below)

o ECal modules can now move to eliminate shadow on HCal

Conversion of run-11 HCal modules to annulus

Run-11 HCL9-col x 12-row

hadron calorimeter

Run-11 HCR9-col x 12-row

hadron calorimeter

Two2-col x 5-row

InsertsFor run 12

13 Jan 2012 5

Critical Run-12 Tests…to be proposed...

• (1) Finish HCal calibration with new annulus: correction for hadronic response

• (2) Test operation of GEM prototype

• (3) Demonstrate 10 pb-1/week at s=500 GeV, as required for runs 13,14 ANDY

Comments:

• Corrections to run-11 HCal calibration for hadron showers expected to be ~20%

• GEMs improve position resolution from ~5cm (run-11) ~0.1mm for calorimeter/preshower association required for background discrimination and other trackings

• Data from run-12 IP2 tests will improve run-11 J/ , enable B J/ +K and start on concurrent s=500 GeV AN measurement required to determine sign of DY AN

With run-12 test, becomes “measured to be”

13 Jan 2012 6

Dileptons from Run 11 Data• ANDY profiling methods were applied to a limited data

sample (Lint=0.5 / pb) of run-11 ECal triggered data.

• Dominant backgrounds are now from , and are suppressed by using MIP response of beam-beam counters to tag clusters.

• Individual detector calibration for HCal was an essential step to reconstruct J/

• Limited granularity of BBC and poor position resolution of HCal-EM cluster results in less photon suppression than expected for final ANDY apparatus (project ~100x better suppression)

• Hadron suppression is not yet required, but will be in going from dileptons to DY

• J/e+e- peak has ~120 events with 5.4 statistical significance. PYTHIA 6.425 with NRQCD expects 420 events in the run-11 acceptance, approximately consistent with observation after crude efficiency correction. From PYTHIA 6.425, DY with M>4 GeV/c2 is 170x smaller in this acceptance.

• J/ is a window to heavy flavor via BJ/K and bJ/p that would help quantify intrinsic b from proton backgrounds to DY

13 Jan 2012 7

Summary

• Proposal is nearing completion… a primary finishing touch is to benchmark PAC proposal simulations against run-11 dilepton signal.

• Limited data sample from run 11 shows dilepton signal of ~120 events from 3.5x107 triggers in ~0.5 pb-1.

• Critical run-12 tests will be proposed following completion of proposal

13 Jan 2012 8

Backup

13 Jan 2012 9

Gas Electron Multiplier

13 Jan 2012 1004/21/23 10

Run11 AN(Jet)

arXiv:1011.2692v1

200GeV

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

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

from p+p

“old” Sivers function

“new” Sivers function

s=200 GeV

• Sivers effect only (no Collins effect contribution)

• Need AN(Jet) measurements before DY

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

13 Jan 2012 11

Schematic of detector for Run-11Polarized proton collisions at s=500 GeV from

February to April 2011

• Beam-beam counter (BBC) for minimum-bias trigger and luminosity measurement from PHOBOS [NIM A474 (2001) 38]

• Zero-degree calorimeter and shower maximum detector for luminosity measurement and local polarimetry (ZDC/ZDC-SMD, not shown)

• Hadron calorimeter modules (HCal) are 9x12 modules from AGS-E864 (NIM406,227)

• Small (~120 cells) ECal loaned from BigCal at JLab

• Pre-shower detector

13 Jan 2012 12

IP2 in January, 2011Left/right symmetric HCal

Left/right symmetric ECal

Left/right symmetric preshower

Trigger/DAQ electronics

Blue-facing BBC

Beryllium vacuum pipe

Many thanks to C-A for the IP2 cleanup and run-11 implementation!

13 Jan 2012 13

Impact of IP2 Collisions

IP2 collisions have begun <3 hours after physics ON with minimal impact on IP6,IP8

Thanks Angelika!

Minimal impact on STAR,PHENIX

Fri. 8 April

1.501011/bunch

13 Jan 2012 14

~2mr crossing angle~1.6mr crossing angle

~0mr crossing angle

systematically increased thresholds for IP2

collisions

Integrated Luminosity in Run-11

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

• Effective BBC cross section has been revisited through full simulations and now is in better agreement with vernier scan measurements (e.g., fill=15457)

• Jet analyzing power measurement sets goal of 10 / pb for run 11.

Many thanks to C-A for IP2 collisions

13 Jan 2012 15

Jet Trigger

• Jet trigger sums HCal response excluding outer two perimeters (rather than just two columns closest to beam)

• Definition is consistent with objective of having jet thrust axis centered in hadron calorimeter modules

• Backgrounds not an issue

• HCal energy scale is now determined

• In total, >750M jet events recorded during RHIC run 11.

Hadron calorimeter is quiet ~107ns before jet event

Hadron calorimeter is quiet again ~107ns after jet event

13 Jan 2012 16

HCal Data/Simulation Intercomparison• require: (1) 1-tower clusters; (2)

E>1.8 GeV; (3) |x|>50 cm to avoid ECal shadow; (4) >1 clusters to form pairs; (5) Epair>5 GeV; (6) Mpair<0.5 GeV; and (7) zpair<0.5.

• Apply to 20M BBCcol events in runs 11088023, 11088031, 11088039, 11088047, 11090004, 11091003, 11091015

• Apply to 20M PYTHIA events subjected to BBC charge sum trigger emulation (no vertex cut)

• Hadronic response also under study with prospects for and to correct h/ differences

peaks

from HCal

HCal energy scale determined from reconstruction. Next step: jet AN

13 Jan 2012 17

Towards Forward Jets

• Good agreement between data and PYTHIA/GEANT simulation for summed HCal response excluding outer two perimeters of cells QCD backgrounds can be modeled

• Good agreement between data and simulation for jet shape

• Next up: forward jet analyzing power

L. Nogach arXiv:1112.1812

13 Jan 2012 18

Forward Jet Energy Scale

• Jet energy scale determined by association analysis of simulation

• Required to add ECal energy deposition to masked summed HCal response

• Small rescaling (<20%) of HCal energy scale is applied, likely to account for hadronic corrections

L. Nogach arXiv:1112.1812

13 Jan 2012 19

Status of Hadronic Response of HCal

• HCal detectors are not fully compensated, meaning h/ response corrections required

• Hadronic response focused on meson reconstruction, to assess calibration via mass peak.

• Likely the best solution will be combining clusters from ECal and HCal, but this awaits GEANT simulations with survey geometry

• For now, focus on , with all clusters in HCal (separately “photon” tagged and “hadron” tagged)

• Reconstruction from 20M PYTHIA/GEANT events looks promising

13 Jan 2012 2020

BigCal from JLab1744 element lead-glass calorimeter

Some people from BigCal have joined AnDY!

This is a picture of BigCal from a talk by Vina Punjabi at the Hall A collaboration meeting in June, 2010. 

Protvino Glass32 column × 32 row submatrix38mm × 38mm ×45cm TF1 glass from IHEP

Yerevan Glass30 column × 24 row submatrix40mm × 40mm × 40cm TF1 glass from Yerevan Physics Institute.

~1200 cells from BigCal are now at BNL/IP2. Remaining 512 cells to come to BNL by end of July.

Unpacked lead glass in 1002B

FEU-84

Still packed cartons, courtesy of JLab

13 Jan 2012 21

ECal Design for Run 13

Existing vertical lift tables from AGS-E949

Thomson rails to move enclosures away from beam for servicing

Stack insert to provide complete ECal coverage

• Major mechanical design for ECal installation in IP2 well advanced by C. Folz.

• Enclosure and cable management plans underway following visit to JLab/BigCal on 17 May.

• BigCal unstacking/packing and shipment to BNL now 2/3 complete, with goal of completed relocating of BigCal to BNL prior to end of July.

• Azimuthal coverage of ECal design is closer to “model 1” acceptance, thereby reducing Lint requirements for 10K DY events

• Safety review in early August?

C. Folz

13 Jan 2012 22

Run 11 Operations/Observations/Questions• Some stores showed impact on STAR,PHENIX when IP2 collisions were initiated. This seemed to be most strongly correlated with tune adjustments. Tune swings just prior to IP2 collisions worked. Tune adjustments after IP2 collisions resulted in prolonged beam loss is scripted “tune swings” before IP2 collisions possible?

• Transverse spin Drell-Yan will require maximum possible P2L, and L>10 pb-1/week with P=50% would be beneficial to ANDY is there any possibility for *<1.5m at IP2? Should emphasis be shifted from L optimization to P2L optimization?

• Primary focus for run 11 was to establish IP2 collisions with minimal impact on STAR,PHENIX. Single-beam backgrounds were clearly observed for brief sNN=200 GeV AuAu run and perhaps could still be improved for s=500 GeV polarized pp. Some stores had large enough ZDC singles rates at IP2 with separation bumps in that there was confusion in STAR, PHENIX and MCR about when IP2 was in collision some development needed in run 12 for reducing single beam backgrounds at IP2

• The 9MHz RF system was operational (!!). We saw no evidence for shorter bunches at IP2 from 9MHz RF system will bunches be shorter in run 12? If so, by how much?

• We plan significant increase in channel count for run 12. Commissioning will be required. Short IR access now lengthened by key retrieval/return to MCR can IP2 iris scanner be reactivated?

• Recent elevated dewpoint/temperatures have resulted in significant condensation for electronics cooling system is climate control for IP2 area possible?