Post on 04-Jan-2016
STAR-TOF and Related Physics Outline Introduction Performance of STAR-TOF prototypes Physics results: achieved & expected Summary and outlookJian WU for the STAR Collaboration Department of Modern Physics, USTC
J.WU USTC
Introduction Solenoidal Tracker At RHIC (STAR)
J.WU USTC
IntroductionWhy STAR-TOF ?Identified hadron spectrafreeze-out dynamicshadronization mechanismIdentified particle correlationsChemical and kinetic properties of in-medium jet associated spectraFluctuations and correlations Lepton programIn-medium vector meson propertiesHeavy flavorBaseline detector for future upgrades TPC dE/dx for low momentum range: /K 0.6 GeV/c proton/meson 1.0 GeV/cTOF will extendmomentum range of PID !
J.WU USTC
Introduction STAR-TOF requirement
Good overall timing resolution: < 100 ps in Au+Au collisions.
Small occupancy per channel: < 10%.
Rate capability: 200 Hz/cm2.
High efficiency: > 90%.
Fit into CTB.
Safe and not impair the performance of other STAR detectors
J.WU USTC
Introduction STAR TOF groupModule construction and QABNL, LBL, MEPI, NASA, UNAM, RICE, UCLA, UT-Austin, U. Washington, YaleHuazhong Normal University, IHEP(Beijing), IMP(Lanzhou), SINAP, Tsinghua, USTCElectronics, tray assembly, and integration&Project supported by DOE & NSFC
J.WU USTC
Performance of STAR-TOF prototypesDesign of Multi-gap Resistive Plate Chamber for TOFrMRPC Strip size3.15cm6.30cmGas gap60.22mmTechnology First developed by ALICE-TOF groupE. 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
Performance of STAR-TOF prototypesTOFr1 Tray Configuration Cover 6 in azimuth and 1 in pseudo-rapidity at radius ~ 2.2m
J.WU USTC
Performance of STAR-TOF prototypes Tray Level TOF Electronics (Final)J. Schambach DOE TOF Review
J.WU USTC
TDIG
TDIG
TCPU
DATA, CLOCK& CANbus
TINO
TINO
MRPC
MRPC
TDIG
TDIG
96 CHAN
TINO
TINO
MRPC
TRAY CAN BUS
MULTIPLICITY
THUB
COPPER: DATA, SAMPLE CLOCK, RESET TRIGGER STROBE & DATA
TOP LEVEL CAN BUS
COPPER LINKS TO 29 TRAYS
SIU
FIBER
CAN BUS TO 29 TRAYS
TCD
DAQ
96 CHAN
4
L0 Trigger
4
TOF Tray
PMTs
TPMD
TDIG
TCPU
Data, Clock& CANbus
Copper:Data, Sample Clk, ResetTrg Strobe & Data
Start Detector
Reset & ClockFrom other THUBs
Reset & ClockTo other THUBs
To Control PC
L2
MRPC
4
4
SIU
FIBER
Clock & Commands
Busy
Fast Z-Vertex Electronics
PMTs
PMTs
TPMD
TPMD
TDIG
TDIG
3
3
Performance of STAR-TOF prototypesTOFr1 Tray in STAR
J.WU USTC
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, small granularity
Rate capability: ~300 Hz/cm2 (test beam, CERN)
High efficiency: > 95%
Will benefit from or enhance the performance of other STAR detectors
J.WU USTC
Performance of STAR-TOF prototypesTime resolutions in Runs
J.WU USTC
Performance of STAR-TOF prototypes Hadron/Electron PID capabilityHadron PID: (, K) ~1.6 GeV/c p ~ 3 GeV/c. STAR Collaboration, PLB616(2005)8Clean 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, PRL94(2005)062301
J.WU USTC
Performance of STAR-TOF prototypes identification powerSTAR Preliminary TOF+TPC : the 2 kaons from are identified using TOF & TPC respectivelyTPC+TPC : the 2 kaons from are identified using only TPC
J.WU USTC
Performance of STAR-TOF prototypes PID by combining TOF+TPCTOF 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
Physics results achieved Phys. Rev. Lett. 97 152301(2006)
J.WU USTC
Physics results achievedIdentified 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) 8Charm Cross section and spectra in p+p, d+Au, Phys. Rev. Lett. 94 (2005) 062301A lot of conference proceedings, QM04, SQM04, QM05, SQM06 talks. Two Ph. D theses.
9 NIMA publications: Nucl.Instrum.Meth.A 478:176-179, 2002 (B. Bonner et al) Nucl.Instrum.Meth.A 492:344-350, 2002 (SHao Ming 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 (Wang Yi et al) Nucl.Instrum.Meth.A 538:243-248, 2005 (Wu Jian et al) Nucl.Instrum.Meth.A 538:425-430, 2005 (Wang Yi et al) Nucl.Instrum.Meth.A 547:334-341, 2005 (Zhao Yan e et al) Nucl.Instrum.Meth.A 558:419, 2006 (Shao Ming et al)More to come from prototype TOFr
Imagine what we can accomplish with Full TOF (120 trays)
J.WU USTC
Physics results expected Physics with Full Barrel TOF - IEvent reduction factor (achieving the same signal statistical significance)
J.WU USTC
Physics results expectedPhysics with Full Barrel TOF - IITPC+TOF+SSD+HFT ~ 200M Central AuAu events : 22Kand 6K vector meson pairs for one year RHIC running
J.WU USTC
Physics results expected Physics with Full Barrel TOF - III
J.WU USTC
Summary and outlook Status & PlansStatusMRPC Standard production procedure setupQuality check measurements definedWeb Parameter Database installed132 MRPCs sent to US already for 4 tray run
J.WU USTC
Summary and outlookStatus & plansProduction Facility at Tsinghua (Left) & USTC (Right)
J.WU USTC
Summary and outlookStatus & plansTray assembly instruments at UT-AustinG. W. HoffmannDOE TOF Review
J.WU USTC
Summary and outlookStatus & plansW.J. Llope DOE TOF ReviewTOFr5 for Runs 5 & 6
J.WU USTC
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 detectors in STAR work well, and satisfy the requirements proposed. t ~ 86 ps , efficiency ~ 95%
TOF prototype detectors have already provided important physics results and a full TOF will provide more !
J.WU USTC
The End Thanks!
J.WU USTC