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A barrel TOF for STAR at RHIC

A barrel TOF for STAR at RHIC. Jian WU for the STAR Collaboration Department of Modern Physics, USTC. Outline Introduction Performance of STAR-TOF prototypes Physics results: achieved & expected Summary and outlook. Introduction S olenoidal T racker A t R HIC ( STAR ).

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A barrel TOF for STAR at RHIC

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  1. A barrel TOF for STAR at RHIC Jian WU for the STAR Collaboration Department of Modern Physics, USTC Outline Introduction Performance of STAR-TOF prototypes Physics results: achieved & expected Summary and outlook J.WU USTC

  2. IntroductionSolenoidalTrackerAtRHIC(STAR) J.WU USTC

  3. IntroductionWhy STAR-TOF ? TPC dE/dxfor low momentum range: π/K 0.6 GeV/c proton/meson 1.0GeV/c • Identified hadron spectra • freeze-out dynamics • hadronization mechanism • Heavy flavor • Identified particle correlations • Chemical and kinetic properties of in-medium jet associated spectra • Fluctuations and correlations • Heavy flavor • Lepton program • In-medium vector meson properties • Heavy flavor TOF will extend momentum range of PID ! J.WU USTC

  4. IntroductionSTAR-TOF requirement • Overall timing resolution: < 100 ps in Au+Au collisions. • Occupancy per channel: < 10%. • Rate capability: 200 Hz/cm2. • High efficiency: > 90%. • Replaces Central Trigger Barrel. J.WU USTC

  5. IntroductionSTAR TOF group Huazhong Normal University, IHEP(Beijing), IMP(Lanzhou), SINAP, Tsinghua, USTC Module construction, QA and calibration & BNL, LBL, MEPI, NASA, UNAM, RICE, UCLA, UT-Austin, U. Washington, Yale Electronics, tray assembly, andintegration Project supported by DOE(US) & NSFC, MST,CAS(China) J.WU USTC

  6. Performance of STAR-TOF prototypesDesign of Multi-gap Resistive Plate Chamber for TOFr Module size: 21.2×9.4×1.79 cm3 MRPC strip size： 3.15cm×6.30cm Gas gap： 6×0.22mm Technology first developed by ALICE-TOF group E. Cerron Zeballos et al. Nucl. Instr. Meth. A 374, 132(1996) M.C.S. Williams et al. Nucl. Instr. Meth. A 478, 183(2002) J.WU USTC

  7. Performance of STAR-TOF prototypesTOFr Tray Configuration Covers 6 in azimuth and 1 in pseudo-rapidity at radius ~ 2.2 m J.WU USTC

  8. Performance of STAR-TOF prototypesTray LevelTOFElectronics (Final) J. Schambach ， DOE TOF Review J.WU USTC

  9. Performance of STAR-TOF prototypesTOFr Tray in STAR TOFr5 for Runs 5 & 6 W.J. Llope， DOE TOF Review J.WU USTC

  10. Performance of STAR-TOF prototypesTOF Starter:pseudo-VertexPositionDetector ±5.4m , 4.43<||<4.94, ~19% (Upgraded in 2006 ×6 acceptance) J.WU USTC

  11. Performance of STAR-TOF prototypesAchievements from the prototype • 86 ps overall timing resolution achieved in 200GeV Au+Au collisions. • 3.15 cm  6.30 cm, 200GeV Au+Au occupancy<10% • Rate capability: ~300 Hz/cm2 (test beam, CERN) • High efficiency: > 95% J.WU USTC

  12. Performance of STAR-TOF prototypesTime resolutions in Runs M. Shao QM2006 Poster J.WU USTC

  13. |1/β-1|<0.03 Performance of STAR-TOF prototypesHadron/Electron PID capability Hadron PID: (, K) ~1.6 GeV/c p ~ 3 GeV/c. STAR Collaboration, PLB 616(2005)8 Clean electron PID can be obtained up to PT< 3 GeV/c.  This has been used to measure the semi-leptonic decay of open charm.STAR Collaboration, PRL 94(2005)062301 J.WU USTC

  14. e π μ Performance of STAR-TOF prototypesMuon identification at low pT 0.15<pT<0.25 GeV/c, DCA<3cm Chen ZHONG (QM2006) Session: Heavy quark production J.WU USTC

  15. Performance of STAR-TOF prototypesφ background suppression Au+Au 200GeV min-bias STAR Preliminary TOF+TPC : one kaon from φidentified by TPC, the other by TOF TPC+TPC : the 2 kaons from φidentified using only TPC J.WU USTC

  16. Performance of STAR-TOF prototypesPID by combining TOF+TPC TOF alone, (, K) ~1.6 GeV/c , p ~ 3 GeV/c. TOF+dE/dx+rdE/dx ( ,p) 0.3~12 GeV/c M. Shao et al., NIMA 558, (419) 2006 J.WU USTC

  17. Physics results Phys. Rev. Lett. 97 152301(2006) J.WU USTC

  18. Physics results • Identified baryon and meson distributions at large transverse momenta from Au+Au collisions at 200 GeV, Phys. Rev. Lett. 97 152301(2006) • 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 • A lot of conference proceedings, QM04, SQM04, QM05, SQM06 talks. • 6 Ph. D theses. • 10 NIM publications:Nucl.Instrum.Meth.A 478:176-179, 2002 (B. Bonner et al) Nucl.Instrum.Meth.A 492:344-350, 2002 (M. Shao et al)Nucl.Instrum.Meth.A 508:181-184, 2003 (B. Bonner et al) Nucl.Instrum.Meth.A 533:60-64, 2004 (F. Geurts et al) Nucl.Instrum.Meth.A 537:698-702, 2005 (Y. Wang et al) Nucl.Instrum.Meth.A 538:243-248, 2005 (J. Wu et al)Nucl.Instrum.Meth.A 538:425-430, 2005 (Y. Wang et al) Nucl.Instrum.Meth.A 547:334-341, 2005 (Y. E. Zhao et al) Nucl.Instrum.Meth.B 241:306, 2005(W.J. Llope) Nucl.Instrum.Meth.A 558:419, 2006 (M. Shao et al) Imagine what we can accomplish with Full TOF (120 trays) J.WU USTC

  19. Physics results expectedPhysics with Full Barrel TOF - I Event reduction factor for two particle decays (achieving the same signal statistical significance) J.WU USTC

  20. Physics results expected Physics with Full Barrel TOF - II TPC+TOF+SSD+HFT ~ 200M Central AuAu events : 22Kand 6K vector meson for one year RHIC running J.WU USTC

  21. Physics results expectedPhysics with Full Barrel TOF - III J.WU USTC

  22. Summary and outlookMRPCStatus & Plans • Status • MRPC Standard production procedure setup • Quality check measurements defined • Web Parameter Database installed J.WU USTC

  23. Summary and outlookMRPCStatus & Plans MRPC production facility at Tsinghua and USTC Tray assembly instruments at UT-Austin J.WU USTC

  24. Summary and outlook • The advantages of new technology – MRPC: good timing resolution, high efficiency , cost effective large area Time of Flight detector. • The prototype of TOF detectors in STAR work well, and satisfy the requirements. • TOF prototype detectors have already provided important physics results! The End Thanks! J.WU USTC

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