Nov.14-20, 2006 QM2006 Shanghai J.WU USTC1 A barrel TOF for STAR at RHIC Outline Introduction ...

Nov.14-20, 2006 QM2006 Shanghai

J.WU USTC 1

A barrel TOF for STAR at RHIC

Outline

Introduction

Performance of STAR-TOF prototypes

Physics results: achieved & expected

Summary and outlook

Jian WU for the STAR Collaboration Department of Modern Physics, USTC


J.WU USTC 2

Introduction Solenoidal Tracker At RHIC (STAR)


J.WU USTC 3

IntroductionWhy STAR-TOF ?

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

TPC dE/dx for low momentum range: π/K 0.6 GeV/c proton/meson 1.0 GeV/c

TOF will extendmomentum range of PID !


J.WU USTC 4

Introduction STAR-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

Introduction STAR TOF group

Module construction, QA and calibrationModule construction, QA and calibration

BNL, LBL, MEPI, NASA, UNAM, RICE, UCLA, UT-Austin, U. Washington, Yale

Huazhong Normal University, IHEP(Beijing), IMP(Lanzhou), SINAP, Tsinghua, USTC

Electronics, tray assembly, andElectronics, tray assembly, and integrationintegration

&

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

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)

Module size: 21.2×9.4×1.79 cm3


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 prototypes Tray Level TOF Electronics (Final)

Start Detector

TDIGTDIGTPMDTPMDPMTsPMTs

TOF Tray

TDIG TDIG

TCPU

DATA, CLOCK& CANbus

TINO TINO

MRPC MRPC

96 CHAN

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

PMTs TPMD TDIG TCPUData, Clock& CANbus

Cop

per

:D

ata

, S

ampl

e C

lk,

Res

etT

rg S

tro

be &

Dat

a

Reset & ClockFrom other THUBs

Reset & ClockTo other THUBs

To Control PC

L2TDIG TDIG

TINO TINO

MRPC MRPC

44

SIU FIBER

Clock & Commands

Busy

Fast Z-Vertex Electronics

3 3

J. Schambach ， DOE TOF Review


J.WU USTC 9

Performance of STAR-TOF prototypesTOFr Tray in STAR

W.J. Llope ， DOE TOF Review

TOFr5 for Runs 5 & 6


J.WU USTC 10

Performance of STAR-TOF prototypes TOF Starter: pseudo-Vertex Position Detector

±5.4m , 4.43<||<4.94, ~19% (Upgraded in 2006 ×6 acceptance)

200GeV/n_pair Au+Au d+Au p+pTrigger Efficiency 100% 30% 10%

t (ps) 25 85 140


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

Operation conditions

Time Resolution (ps)

pVPDTOFr

(overall)

TOFr

(intrinsic)

Run III200GeV d+Au ~85 ~120 ~85

200GeV p+p ~140 ~160 ~80

Run IV

62GeV (Au+Au) ~55 ~105 ~89

200GeV (Au+Au)

FF/RFF ~27 ~86(74) ~82(70)

HF ~20 ~82(74) ~80(71)

Run V200GeV Cu Cu (ToT) ~ 50 ~105(92) ~92(75)

62GeV Cu Cu (ToT) ~ 82 ~125 ~94

M. Shao QM2006 Poster


J.WU USTC 13

Performance of STAR-TOF prototypes Hadron/Electron PID capability

Hadron PID: (, K) ~1.6 GeV/c p ~ 3 GeV/c.

STAR Collaboration, PLB 616(2005)8

|1/β-1|<0.03

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

Performance of STAR-TOF prototypes Muon identification at low pT

e

μ

π

0.15<pT<0.25 GeV/c, DCA<3cm Chen ZHONG (QM2006)Session: Heavy quark production


J.WU USTC 15

Performance of STAR-TOF prototypes φ background suppression

STAR Preliminary

TOF+TPC : one kaon from φ identified by TPC, the other by TOF TPC+TPC : the 2 kaons from φ identified using only TPC

Au+Au 200GeV min-bias


J.WU USTC 16

Performance of STAR-TOF prototypes PID 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 expected Physics with Full Barrel TOF - I

Event reduction factor for two particle decays (achieving the same signal statistical significance)

Particle pT range (GeV/c) (TPC+TOF)/TPC

K*0 0-1 2.0

K*0 1-2 1.85

K*0 2-3 1.74

K*0 3-5 1.39

0-2 5.0

2-5 3.42

Λ* 0-1.6 11.4

D0 0-5 4.6


J.WU USTC 20

Physics results expectedPhysics with Full Barrel TOF - II

TPC+TOF+SSD+HFT ~ 200M Central AuAu events : 22Kand 6K vector meson for one year RHIC running


J.WU USTC 21

Physics results expected Physics with Full Barrel TOF - III

Measurement Physics Goal

all particle v2, especially increasing the efficiency for multi-strange particle v2 measurement

Fix the partonic collectivity parameters

Fluctuation/ correlation studies with PID Understand the nature of possible phase transition

Away-side jet fragmentation yields, spectra Search for Mach cone

Yields, spectra of high-mass resonancesMap out most of the resonances (if it is not all) from RHIC

Unlike-particle (e.g., -) correlationsSpatial and temporal distributions of hadron production

Charmed hadron flow and yield ratiosCharm collectivity and thermalization of light quarks (u,d,s)

Heavy quark jets; D,B-meson spectra at high pTProbe partonic medium and understand the nature of parton interactions, i.e. parton energy loss

Inclusive lepton and di-lepton spectra and invariant mass distributions

Study possible in-medium modification of hadrons.

e+e pair production in UPC Strong field QED effects

o longitudinal polarization correlations CP violation search


J.WU USTC 22

Summary and outlook MRPC Status & Plans

StatusMRPC Standard production procedure setupQuality check measurements definedWeb Parameter Database installed


J.WU USTC 23

Summary and outlook MRPC Status & Plans

Tray assembly instruments at UT-Austin

MRPC production facility at Tsinghua and USTC


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!Thanks!

Nov.14-20, 2006 QM2006 Shanghai J.WU USTC1 A barrel TOF for STAR at RHIC Outline Introduction ...

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