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The STAR barrel TOF detector upgrade: an overview

The STAR barrel TOF detector upgrade: an overview. T. Hallman Brookhaven National Laboratory Annual DOE TOF Review Brookhaven National Laboratory August 25-26, 2006. The outline of this talk. Overview of the proposed TOF upgrade New Physics Reach provided by the STAR TOF upgrade

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The STAR barrel TOF detector upgrade: an overview

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  1. The STAR barrel TOF detector upgrade: an overview T. Hallman Brookhaven National Laboratory Annual DOE TOF Review Brookhaven National Laboratory August 25-26, 2006 TJH: DOE TOF Review 2006, 9/25-26 BNL

  2. The outline of this talk • Overview of the proposed TOF upgrade • New Physics Reach provided by the STAR TOF upgrade • Brief Word on Cost and Schedule • The TOF upgrade construction team • Conclusions TJH: DOE TOF Review 2006, 9/25-26 BNL

  3. STAR Detector TOF Trays TJH: DOE TOF Review 2006, 9/25-26 BNL

  4. Main features • Large acceptance TOF detector to dramatically extend STAR’s scientific • reach through enhanced PID. Specifically: • 120 Trays of MRPC modules to cover acceptance of the STAR TPC having: • TOF Resolution< 100 ps • Large coverage –p < f <p, -1< h < 1, R ≈ 2.1 m • More than double the momentum range of present STAR PID (95% of charged • particles in acceptance) • 3800 modules with 23,000 readout channels • Fast detector response – maintains (improves) trigger capability of existing • CTB scintillators. TJH: DOE TOF Review 2006, 9/25-26 BNL

  5. MRPC Module Structure TJH: DOE TOF Review 2006, 9/25-26 BNL

  6. Module design is well proven with discreet electronics and prototype final electronics p/K separation to p = 1.6 GeV/c (0.7 for TPC Alone) (+K)/p to p = 3 GeV/c (1.2 for TPC Alone) TJH: DOE TOF Review 2006, 9/25-26 BNL

  7. Extending STAR Particle ID Log10(dE/dx) Log10(p) • TPC: • Pion: 0-~0.6GeV/c • Kaon: 0.2-~0.6GeV/c • Proton: 0.2-~1 GeV/c Results up to 12 GeV/c in Au+Au Methods paper submitted to NIM A, nucl-ex/0505026. • TPC+TOF: • Pion: 0.-~10 GeV/c • Kaon: 0.2-~3GeV/c • Proton: 0.2-~? GeV/c • TOF: • Pion: 0.2-~1.6GeV/c • Kaon: 0.2-~1.6GeV/c • Proton: 0.2-~3 GeV/c TJH: DOE TOF Review 2006, 9/25-26 BNL

  8. STAR TOF Barrel Status What TOF Provides: PID information for > 95% of kaons and protons in the STAR acceptance clean e± ID down to 0.2 GeV/c Status of Construction Project • Construction project underway • First 130 modules off Chinese production • lines complete; 62 in hand, 68 in shipment • to U.S.A. • Construction of mechanical elements (trays, • stacking fixtures, etc.) on track • Project cost and schedule within • envelope of DOE construction project • Significant implementation by Run 8, completion in FY09 • Budget: $4.8M US, $2.3M in-kind from China TJH: DOE TOF Review 2006, 9/25-26 BNL

  9. Scientific urgency of TOF upgrade for STAR/RHIC Where are we in studying the new matter discovered at RHIC? Dramatic effects in the production of particles with light quarks indicate the discovery of a new strongly interacting dense state of matter with: Very high energy density ( ~ 10-15 GeV/fm3) Collective transverse motion, very likely at established at an early partonic stage when the DOF are those of quarks and gluons What’s questions must be answered next? Is the matter thermalized? How do high pT partons couple to the bulk matter? How does the matter hadronize? Is chiral symmetry restored? What does 2 TOF Provide? Dramatic increase in S/N for Heavy Flavor Identified particle correlations Identified hadron spectra Leptonic decays The STAR Barrel TOF provides completely new physics reach and significantly improves PID for every STAR mid-rapidity measurement TJH: DOE TOF Review 2006, 9/25-26 BNL

  10. A new physics horizon in STAR provided by the TOF upgrade: electrons at intermediate pT One entirely new physics horizon opened in STAR by the TOF upgrade.. charmonium open charm vector mesons all tracks TOF  ~ 1 TJH: DOE TOF Review 2006, 9/25-26 BNL

  11. Dilepton capability TPC+TOF+SSD+HFT ~ 200M central Au+Au events : 22Kand 6K vector meson pairs for one year RHIC running TJH: DOE TOF Review 2006, 9/25-26 BNL

  12. Examples of benefit of TOF Open Charm and Resonances in central Au-Au collisions FOM (figure of merit) = reduction in required data set by using TOF PID for a significance of 3σ TOF PID also reduces systematic errors from correlated back-ground due to misidentified particles Certain measurements are impossible without TOF – unlike particle correlations, scale dependent correlation studies (velocity vs momentum correlations), exotic searches… TJH: DOE TOF Review 2006, 9/25-26 BNL

  13. Does a QCD Critical Point Exist? If so, where? • LQCD results show that as the baryon chemical potential • increases, fluctuations on the cross-over line increase • suggesting a critical point in the QCD phase diagram. The location of the QCD Critical Point, if it exists, remains a matter for experiment The search for critical fluctuations will be central for which full 2 TOF is crucial: Misidentification of only 1% leading to a swapping of pions for kaons reduces the width of the observed k/pi fluctuation distribution by 10%. A misidentification of 2% leads to a reduction in width of 20%. TJH: DOE TOF Review 2006, 9/25-26 BNL

  14. Cost and Schedule A complete status of the cost/schedule plan will be presented by Geary Eppley Main Points: Cost: $ 4.8M including escalation ($2.3M in-kind for MRPC modules) Schedule: Complete by second quarter of FY09 Scope: All trays complete and delivered to BNL Manpower: In harness and working Short summary: Cost and Schedule continue to be challenging but so far the project is on track. Some draw on contingency requested due to startup adjustments TJH: DOE TOF Review 2006, 9/25-26 BNL

  15. STAR TOF Team Leaders • Rice University *: • Geary Eppley, Bill Llope, Nussbaum • University of California* : • Huan Huang, Vahe Ghazikhanian • University of Texas *: • Gerry Hoffmann, Joe Schambach, Christina Markert • Moscow Engineering Physics Institute* • Leonid Kotchenda • Brookhaven National Laboratory:* • Zhangbu Xu, Danny Padrazo, Bill Christie, Tim Hallman • Lawrence Berkeley National Laboratory: • Nu Xu, Lijuan Ruan, Bedanga Monhanty, Xin Dong • Blue Sky Electronics* • Lloyd Bridges • (* line responsibility for construction activity) TJH: DOE TOF Review 2006, 9/25-26 BNL

  16. U.S.-China Collaboration on STAR TOF • University of Science and Technology of CHINA* : • Hongfang Chen • Tsinghua University* : • Jianping Cheng • Shanghai Institute of Nuclear Research* : • Yugang Ma • Central China Normal University, Wuhan (CCNU): • Feng Liu • Institute of Modern Physics at LanZhou: • Wenlong Zhan • Institute of High Energy Physics, Beijing: • Jin Li • 6 Institutions, ~30 Scientists and Students • (* line responsibility for fabrication of MRPC modules) TJH: DOE TOF Review 2006, 9/25-26 BNL

  17. A little PID goes a long way !STAR MRPC TOF publications already • Identified baryon and meson distributions at large transverse momenta from Au+Au collisions at 200 GeV, nucl-ex/0606003, accepted by PRL. • PID Cronin Effect in d+Au, Phys. Lett. B 616 (2005) 8. • Charm Cross section and spectra in p+p, d+Au,Phys. Rev. Lett. 94 (2005) 062301. • Conference proceedings for QM04, SQM04, QM05, and SQM06 • Two Ph. D theses. • 8 NIM A publications:Nucl.Instrum.Meth.A538:243-248,2005Nucl.Instrum.Meth.A533:60-64,2004Nucl.Instrum.Meth.A492:344-350,2002Nucl.Instrum.Meth.A508:181-184,2003Nucl.Instrum.Meth.A478:176-179,2002Nucl.Instrum.Meth.A538:425-430,2005Nucl.Instrum.Meth.A537:698-702,2005Nucl.Instrum.Meth.A558:419,2006 • Two Ph. D theses next year, 3 QM06 talks, 2 STAR papers in preparation. Imagine what will be possible with the full barrel TOF TJH: DOE TOF Review 2006, 9/25-26 BNL

  18. Conclusion • Scientific merit is exceptional • Technology is in hand • Construction project underway in China and US • Some startup adjustments to C/S—no major showstoppers • Cost and Schedule are being tracked closely • Strong, committed team working on the project • STAR is building this upgrade, and anxiously waiting to get at the • science it will make possible TJH: DOE TOF Review 2006, 9/25-26 BNL

  19. Backup Slides TJH: DOE TOF Review 2006, 9/25-26 BNL

  20. TJH: DOE TOF Review 2006, 9/25-26 BNL

  21. TJH: DOE TOF Review 2006, 9/25-26 BNL

  22. Identified Particle Spectra and Flow Analyses TJH: DOE TOF Review 2006, 9/25-26 BNL

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