1 / 39

The Time-Of-Flight Detector for RHIC/STAR and Related Physics

The Time-Of-Flight Detector for RHIC/STAR and Related Physics. Jian WU University of Science & Technology of China. Outline Introduction MRPC & Performance of TOF prototypes Physics results Summary and outlook. 2SC. Introduction Heavy Ion Collisions – search for QGP. Tc~160MeV

cece
Download Presentation

The Time-Of-Flight Detector for RHIC/STAR and Related Physics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Time-Of-Flight Detector for RHIC/STAR and Related Physics Jian WU University of Science & Technology of China Outline Introduction MRPC & Performance of TOF prototypes Physics results Summary and outlook ATHIC 2006 Seoul

  2. 2SC IntroductionHeavy Ion Collisions – search for QGP Tc~160MeV ε(Tc)~1GeV/fm3 ATHIC 2006 Seoul

  3. BRAHMS PHOBOS STAR PHENIX IntroductionRelativistic Heavy Ion Collider (RHIC) ATHIC 2006 Seoul

  4. IntroductionSolenoidalTrackerAtRHIC(STAR) ATHIC 2006 Seoul

  5. IntroductionParticleIDentification@STAR Ionization Energy Loss (dE/dx) in TPC π/K 0.6 GeV/c proton/meson 1.0GeV/c ATHIC 2006 Seoul

  6. IntroductionWhy TOF of MRPC ? Key measurements so far: • Collective flow • High pT suppression --- jet quenching • Number of constituent quark scaling of elliptic flow Stable particles, resonances, V0 particles etc. • Identified particle characteristics • High pT reach • High detecting efficiency New technology – MultigapResistivePlateChamberEconomic! ATHIC 2006 Seoul

  7. IntroductionTOF requirement • Requirements about TOF detector for STAR • Good timing resolution (<100ps) • Small occupancy (~10%) • Large acceptance (|η|<1, ΔΦ~2π) • Greatly Extend PID capability of stable hadrons: pi/K ~ 1.8GeV, p/(pi+K) ~ 3GeV • Significantly reduce the integrated luminosity needed for the key measurements. • Extend the pT reach of resonances measurements. • Allow us to study large and small scale correlations and fluctuations. • ...... ATHIC 2006 Seoul

  8. MRPC & Performance of TOF prototypes 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) ATHIC 2006 Seoul

  9. MRPC & Performance of TOF prototypes Sensitive area ~20 x 6.3 cm2 ATHIC 2006 Seoul

  10. MRPC & Performance of TOF prototypes ATHIC 2006 Seoul

  11. MRPC & Performance of TOF prototypes Simulation of MRPC : Charge distributions M. Abbrescia et al., Nucl. Instr. and Meth. A 398 (1997) 173-179 Nucl. Instr. and Meth. A 431 (1999) 413-427 ATHIC 2006 Seoul

  12. MRPC & Performance of TOF prototypes Proto type of MRPC-TOF (TOFr) 241.3cm long, 21.6cm wide and 8.9cm high. 32 MRPC modules ATHIC 2006 Seoul

  13. MRPC & Performance of TOF prototypes Test of TOFr @AGS • gas : Freon 90% i-C4H10 5% SF6 5% • Efficiency > 95% • σt < 75 ps B. Bonner et al., Nucl. Instr. Meth. A 508, 181(2003) M. Shao et al., Nucl. Instr. Meth. A 492, 344(2002) ATHIC 2006 Seoul

  14. MRPC & Performance of TOF prototypes TOFr @STAR ATHIC 2006 Seoul

  15. MRPC & Performance of TOF prototypes TOF Starter: Pseudo-Vertex Position Detector • ±5.4m , 4.43<||<4.94, ~19% • Trigger Efficiency:100%,30%,10%in Au+Au,d+Au,p+p • t:25,85,140 psinAu+Au,d+Au,p+p(200 GeV) ATHIC 2006 Seoul

  16. MRPC & Performance of TOF prototypes ATHIC 2006 Seoul

  17. Physics results ATHIC 2006 Seoul

  18. Physics results ATHIC 2006 Seoul

  19. Summary and outlook • The advantages of new technology – MRPC: good timing resolution, high efficiency , low cost to enable large acceptance etc. • The prototype of TOF detector in STAR works well, and satisfies the requirements proposed. σt ~ 85 ps , efficiency ~ 95% • TOFr detector has already provided important physics results. ATHIC 2006 Seoul

  20. Summary and outlook Physics with Full Barrel TOF - I Reduce the required integrated luminosity Open charm Resonances ATHIC 2006 Seoul

  21. Summary and outlook Physics with Full Barrel TOF - II Vector meson study – benefit from the electron PID Total bkgd: ~10-4/25MeV (ω) ~2∙10-5/25MeV (Φ) Dalitz decay bkgd: ~5∙10-6/25MeV (ω) ~5∙10-7/25MeV (Φ) ATHIC 2006 Seoul

  22. Summary and outlookPhysics with Full Barrel TOF - III ATHIC 2006 Seoul

  23. Summary and outlook Project Schedule ATHIC 2006 Seoul

  24. STAR TOF group STAR TOF Team: 16 institutions US Electronics, tray assembly and integration China Module construction andQA BNL, LBL, MEPI, NASA, UNAM, RICE, UCLA, UT-Austin, U. Washington, Yale Huazhong Normal University, IHEP(Beijing), IMP(Lanzhou), SINR, Tsinghua, USTC ATHIC 2006 Seoul

  25. The End Thanks! ATHIC 2006 Seoul

  26. Backup slides ATHIC 2006 Seoul

  27. Today t = 51017 sec T=1 meV Quark-hadron transition Hadrons form - protons & neutrons t = 10-6 sec T=1 GeV The Planck epoch ATHIC 2006 Seoul

  28. Specification of typical MRPC ATHIC 2006 Seoul

  29. ATHIC 2006 Seoul

  30. Avalanche Process Exponential Avalanche Avalanche Fluctuation Coefficient: The Signal Induced Process Ionization Process Weighting Field Cluster Numbers: Total Signal in One Gap: j-th Cluster Position: Working Principle Simulation ATHIC 2006 Seoul

  31. W.J. Llope et al., nucl-ex/0308022 ATHIC 2006 Seoul

  32. ATHIC 2006 Seoul

  33. detecting efficiency: ~95%was achieved. ATHIC 2006 Seoul

  34. Cronin Effect of Identified Particles • Enhancement above pT ~ 1-1.5 GeV/c • RdAu of protons increases faster than that of pions • Protons ~ not Nbin scaling in intermediate pT nucl-ex/0309012 ATHIC 2006 Seoul

  35. Cronin Data at Lower energy J.W. Cronin et al., PRD 11, 3105 (1975); • Enhancement of hadron production in proton-nucleus collisions. • R=1 in absence of nuclear effects. • Bound nucleons “cooperate” producing high-pT particles. • Suppression at small pT. • Explained by initial multiple scattering. Cronin effect larger for protons compared to pions ATHIC 2006 Seoul

  36. Proton/hadron ratio J.W. Cronin et al., PRD 11, 3105 (1975) P.B. Straub et al., PRL 68, 452 (1992) nucl-ex/0309012 • p-=0.041 0.010  0.006 (1.2 < pT < 3 GeV/c), lower energy sqrt(s)~30 GeV/c, p-=0.095 0.004 • (pbar+p)/h=0.24,a factor of 2 smaller than that in Au+Au AuAu baryon excess due to Final State Effect. ATHIC 2006 Seoul

  37. nucl-ex/0407006 ATHIC 2006 Seoul

  38. Physics with Full Barrel TOF - I Improve the V0 particle reconstruction significance Clearly identified daughters Outlook ATHIC 2006 Seoul

  39. ATHIC 2006 Seoul

More Related