A N DY RHIC Run-11 Goals/Status/Operation

1. ANDYRHIC Run-11 Goals/Status/Operation L.C. Bland, BNL RHIC Retreat 20 July 2011

2. ANDY E.C.Aschenauer, A. Bazilevsky, L.C. Bland, K. Drees, C. Folz, Y. Makdisi, A. Ogawa, P. Pile, T.G. Throwe Brookhaven National Laboratory H.J. Crawford, J.M. Engelage, E.G. Judd University of. California, Berkeley/Space Sciences Laboratory C.W. Perkins University of. California, Berkeley/Space Sciences Laboratory /Stony Brook University A. Derevshchikov, N. Minaev, D. Morozov, L.V. Nogach Institute for High Energy Physics, Protvino G. Igo University of California, Los Angeles M. Grosse Perdekamp University of Illinois M.X. Liu Los Alamos National Laboratory H. Avakian Thomas Jefferson National Accelerator Facility E.J.Brash Christopher Newport University and TJNAF C.F.Perdrisat College of William and Mary V. Punjabi Norfolk State University Li, Xuan Shandong University, China Mirko Planinic, Goran Simatovic University of Zagreb, Croatia A. Vossen Indiana University G. Schnell University of the Basque Country and IKERBASQUE,Spain A. Shahinyan, S. Abrahamyan Yerevan Physics Institute “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 2

3. ANDY Goalsfor RHIC run-11 • 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 in “model 2”. 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. Recent theoretical work establishes intrinsic interest in the jet analyzing power measurement. (Beyond the letter of intent)

4. Run11 AN(Jet) arXiv:1103.1591 jet AN measurements are required to clarify signs of quark/gluon correlators related to Sivers functions. arXiv:1011.2692v1 s=200 GeV from p+pp “new” Sivers function “old” Sivers function 200GeV Non-zero jet analyzing power essentially a prerequisite before proceeding to Drell Yan 12/1/2014 • Sivers effect only (no Collins effect contribution) • Need AN(Jet) measurements before DY • With ~10/pb & P=50%, AnDY run11 can measure AN(Jet) 4

5. IP2 in January, 2011 Trigger/DAQ electronics Left/right symmetric HCal Left/right symmetric ECal Blue-facing BBC Left/right symmetric preshower Beryllium vacuum pipe Many thanks to C-A for the IP2 cleanup and run-11 implementation!

6. Minimal impact on STAR,PHENIX Impact of IP2 Collisions Fri. 8 April 1.501011/bunch IP2 collisions have begun <3 hours after physics ON with minimal impact on IP6,IP8 Thanks Angelika!

7. Integrated Luminosity in Run-11 ~1.6mr crossing angle ~0mr crossing angle systematically increased thresholds for IP2 collisions ~2mr crossing angle • 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

8. Jet Trigger Hadron calorimeter is quiet ~107ns before jet event • 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 again ~107ns after jet event

9. 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 r±p±p0 and wp+p-p0 to correct h/g differences p0gg peaks from HCal HCal energy scale determined from p0gg reconstruction. Next step: jet AN

10. ZDC Calibration • ZDC at IP2 were uncalibrated during s=500 GeV p+p running. • There were some issues related to luminosity and ZDC that could be addressed by calibrating the ZDC, as best done by the single neutron peak in sNN=200 GeV Au+Au collisions • IP2 was brought into collision for two stores (16075,16081) enabling ~30M minimum bias events and calibration of sector-3 ZDC (second module of this ZDC did have low gain. The impact on local polarimetry needs investigation.) Neutron peak from AuAu collisions

11. Developments • Program Advisory Committee review of ANDY proposal 6 June: endorses project • 2/3 of BigCal now at BNL, with remaining 1/3 to be moved before the end of July • 400 XP-2972 photomultipliers + Cockcroft-Walton bases loaned to ANDY for preshower are now at BNL • Lowered Lint expectations has led to major changes in the original ANDY configuration to gain a factor of two more acceptance. Funding proposal nearing completion… • Optimized ANDY acceptance for estimated 10 pb-1/week  estimates are favorable for transverse spin DY without magnet. Split-dipole from PHOBOS now is aperture restriction and will require larger gap between poles. This makes 3D magnet calculations and field mapping critical. Full-acceptance charge-sign measurement would greatly benefit by shorter bunches. • Have specified construction tasks prior to RHIC run 12  primary effort is construction of ECal and preshower. Reconfiguration of HCal also required to optimally use larger ECal acceptance

12. BigCal from JLab1744 element lead-glass calorimeter Protvino Glass 32 column × 32 row submatrix 38mm × 38mm ×45cm TF1 glass from IHEP Yerevan Glass 30 column × 24 row submatrix 40mm × 40mm × 40cm TF1 glass from Yerevan Physics Institute. Unpacked lead glass in 1002B This is a picture of BigCal from a talk by Vina Punjabi at the Hall A collaboration meeting in June, 2010.  Some people from BigCal have joined AnDY! FEU-84 ~1200 cells from BigCal are now at BNL/IP2. Remaining 512 cells to come to BNL by end of July. 12 Still packed cartons, courtesy of JLab

13. Thomson rails to move enclosures away from beam for servicing Stack insert to provide f complete ECal coverage Existing vertical lift tables from AGS-E949 ECal Design for Run 12 C. Folz • 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?

14. 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 b*<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?

15. Summary • Collisions can occur at IP2 in polarized proton operation at s=500 GeV without significant impact on operations at IP6,IP8. Integrated luminosity projected for runs 12,13 is sufficient for a significant measurement of the analyzing power for Drell Yan production. • Calibration of HCal has been accomplished. Further work on hadronic response is needed to establish a jet energy scale for the run-11 data. Significant integrated luminosity was acquired during run 11 to allow for measurement of the jet analyzing power. • The additions of ECal (BigCal from JLab) and preshower and ~100 / pb of integrated luminosity for p+p collisions at s=500 GeV will allow AnDY to address in RHIC run 12 the goal… • to observe J/e+e- and Ue+e- and the dilepton continuum between these two signals as a clear benchmark for DY feasibility