RHIC-STAR飞行时间谱仪

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1、RHIC-STAR飞行时间谱仪的进展CHEN,Hongfang,USTCforSTAR-China2005June28-301ShanghaiEasternForumTimeofFlightProjectinSTARIntroductionofMulti-gapResistivePlateChamber(MRPC)PrototyperunninginSTARPreparationformassproductioninChina(atUSTCandTsinghua)ConclusionOutline2005June28-302ShanghaiEasternForumTimeofFlight

2、ProjectinSTAR80年代初物理学家提议建立高能重离子装置产生和研究QGP,高温QCD物质。T.D.Lee提议在BNL利用ISABELLA的隧道来建造RHIC。1991年在BNL开始建造。1999年建成，环周长3.8公里。加速金核最大能量100GeV/Nu2005June28-303ShanghaiEasternForumSTARDetector(baseline)Largecoverage>2,~2ZCalBarrelEMCalorimeterEndcapCalorimeterMagnetCoilsTPCEndcap&MWPCZCalFTPCsVertexPositi

3、onDetectorsCentralTriggerBarrelorTOFTimeProjectionChamberSiliconVertexTracker2005June28-304ShanghaiEasternForumSpecificEnergyLossinSTARTPCSTARp+pat200GeVdataddtpKpKpeeWiththeSTARTPCKpidentification:pT~0.6GeV/cProtonidentification:pT~1.1GeV/cS/Nforfreconstruction:~1/few100Multi-strangeparticlesrec

4、onstructionefficiency:~10-4--10-3J.Ma,Yamamotoetal.2005June28-305ShanghaiEasternForumUpgradeRequirementsKeep(expand)thegeneralSTARphilosophyoflargecoverageHighratereadoutandDAQMicrovertexdetectorforenhancedheavyquarkIDEnhanced(highermomentum)PIDbarrelTOFHighratetrackingcapabilityandimprovedmoment

5、umresolution(TPCreplacement,GEMtechnology)2005June28-306ShanghaiEasternForumbyR.MajkaforSTARBarrelTimeofFlightusingMulti-gapResistivePlateChambersGoal:CoverentireouterbarrelofTPCwithaffordable,highresolutionTOF(0<Φ<2π,-1<η<1,t<100ps)LimitsForPID2σPIDTPCdE/dxTOF(η~0)TOF(η~1)π/K/P~0.7GeV/c~1.6GeV/

6、c~2.0GeV/c(π+K)/p~1.0GeV/c~2.6GeV/c~3.2GeV/cd~1.0GeV/c~4.0GeV/c~4.7GeV/cWithTOF,over95%oftheparticlesintheTPCacceptancewillbeIdentified2005June28-307ShanghaiEasternForumGoodtimeresolution(<100ps),highdetectionefficiency(>95%),highgranularity,robustious,lowcost.Activearea:20×6cm,ReadoutPad：3.15cm×

7、6.1cm,gap：6×0.22mmGas：95%C2H2F4+5%Iso-C4H10Beamtestresult多气隙电阻板室（MRPC）是在95年以后发展的一种新探测器，利用MRPC技术制作桶部STAR－TOF探测器是一个好的方案。在STAR上采用MRPC技术建成TOF系统，将是国际上首先应用此技术的TOF。TOF的运行将大大改进和扩展STAR的粒子识别能力，增强物理潜力。这是一项有高技术含量的硬件建设工作。Introducti