Fuminori Sakuma, RIKEN for the J-PARC E15 Collaboration

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Development of the Cylindrical Detector System for an experimental search for kaonic nuclei at J-PARC. Fuminori Sakuma, RIKEN for the J-PARC E15 Collaboration. J-PARC E15 Experiment Cylindrical Detector System Cylindrical Drift Chamber (CDC) Z-Vertex TPC Summary. - PowerPoint PPT Presentation

Transcript of Fuminori Sakuma, RIKEN for the J-PARC E15 Collaboration

  • Development ofthe Cylindrical Detector Systemfor an experimental searchfor kaonic nuclei at J-PARCFuminori Sakuma, RIKENfor the J-PARC E15 Collaboration*J-PARC E15 ExperimentCylindrical Detector SystemCylindrical Drift Chamber (CDC)Z-Vertex TPCSummaryThe Third Joint JPS/DNP Meeting (Hawaii 2009), Oct. 13-17, 2009

  • *J-PARC E15 Experimentsearch for K-pp bound state using 3He(K-,n) reactionK-3Heexclusive measurement by Missing mass spectroscopyandInvariant mass reconstruction Missing massSpectroscopy via neutron Invariant mass reconstruction at J-PARC

  • *J-PARC E15 Setup1GeV/cK- beampp-pnmass resolution for K-ppinvariant mass s = 19MeV/c2 (sCDC = 250mm)missing mass (for 1.3GeV/c neutron) s = 9.2MeV/c2 (sToF = 150ps)K1.8BR Beam Lineflight length = 15mneutronBeam trajectoryCDS &targetSweepingMagnetNeutronCounterBeam LineSpectrometer

  • *Cylindrical Detector System (CDS)Solenoid MagnetCylindrical Drift ChamberL3He Target SystemZ-Vertex TPCHodoscope Counter

  • *Cylindrical Drift Chamber (CDC)hexagonal cell (drift length ~9mm)15 layers (r = 19.05~48.45cm)7 super layers (AUVAUVA)made of Aluminum and CFRP# of wires : 8136 (read-out : 1816ch)solid angle = 2.6pAr:C2H6=50:50

  • *CDC (Contd)preamp cards and cables are attachedTDCs in the counting roomLVDSECL converters at the exp. hallChip : CXA3183Q (SONY, low noize ASD IC, t=16nsec)Output : LVDS differentialGain : 0.8V/pC at preamp8mcables60mcablesLVDSECL

  • *CDC Study with Cosmic-RayIntrinsic spatial resolution ~200mmCDC works good with expected performancesefficiency x-t correlationresidual resolutions=206mm--- cosmic-ray runstereostereo(using 90Sr)T.Hiraiwa (Kyoto-u)K.Tsukada (RIKEN)

  • *Z-Vetex TPC (Z-TPC)To improve z-resolution,Z-TPC is newly constructingreadout-padpad size:20x4mm# of pad:4x4x9=144 field stripdouble sided flexible print circuit board8mm strip10mm pitch

  • *Z-TPC (Contd)a double TGEM structure is used for amplificationSony ASD chips are used for our preamp at first (No dE/dx)in the future, fast FADC or ASDQ chips will be used to measure dE/dxTGEM for Z-TPCreadout partpreamps framefield cageZ-TPC will be ready in this year

  • *Thick-GEMa robust, simple to manufacture, high-gain gaseous electron multipliercost-effectively fabricated from double-clad G10 plates, using standard printed circuit board (PCB) techniquesholes are mechanically drilled (and the holes rim is chemically etched to prevent discharges)easy to operate and feasible to cover large areas, compared to the standard foil GEMThick-GEM @ RIKENw/ Rimsw/o Rims

  • *Thick-GEM StudyRETGEM: carbon electrodesH-RETGEM: carbon and copper electrodes on each sideThe TGEMs reach effective gain of ~104, that is of practical use

    It seems that the RETGEMs and hybrid RETGEMs work goodgoal ~104M.Tokuda (Tokyo-TECH)

    TypeCommentfholedrimpitchthicksizeTGEM1w/ rim0.3mm0.05mm0.6mm0.4mm100mmX100mm

    TGEM2w/o rimXRETGEMCarbonXH-RETGEMC+Cu hybridX

  • *Thick-GEM Studystart gain ~ 2x104start gain ~ 4x103RETGEM relative gainenergy resolutionTGEM1relative gainenergy resolutionstart gain ~ 2x104start gain ~ 4x103TGEM2relative gainenergy resolutionstart gain ~ 2x104start gain ~ 4x103start gain ~ 2x104start gain ~ 4x103H-RETGEM relative gainenergy resolutionRETGEM: carbon electrodesH-RETGEM: carbon and copper electrodes on each sideall TGEMs keep almost constant gain after initial gain dropinstablestable, but, there are no reproductive repeatability of the RETGEMs

    TypeCommentfholedrimpitchthicksizeTGEM1w/ rim0.3mm0.05mm0.6mm0.4mm100mmX100mm

    TGEM2w/o rimXRETGEMCarbonXH-RETGEMC+Cu hybridX

  • *Thick-GEM Studyinstability in the TGEM with rims is caused by charge up of the insulator?lack of productive repeatability of RETGEM is caused by drilling process?We have to study TGEM/REGEM in more detailproblems to be solved!RETGEM: carbon electrodesH-RETGEM: carbon and copper electrodes on each side

    TypeCommentfholedrimpitchthicksizeTGEM1w/ rim0.3mm0.05mm0.6mm0.4mm100mmX100mm

    TGEM2w/o rimXRETGEMCarbonXH-RETGEMC+Cu hybridX

  • *SummaryJ-PARC E15 experimentSearch for the simplest deeply-bound kaonic nuclear state, K-pp, by in-flight 3He(K-,n) reactionDetector construction is in progressSolenoid Magnet, CDC, Z-TPC, CDH, 3He Target, and other detectorsCDC works good with expected performancesZ-TPC will be completed in this yearTGEM study is ongoingInstability of TGEM with rimsLack of productive repeatability of RETGEMThe goal is to develop the stable TGEM/RETGEM.

  • *J-PARC E15 Collaboration

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  • Physics Motivation*QGPneutronstarSPS, RHIC, LHCKEK-PSW.Weise NPA553, 59 (1993).E549@KEK-PSFINUDA@DAFNEDISTO@SATURENOBELIX@CERN-LEART.Yamazaki, A.Dote, Y.Akiaishi PLB587,167(2004).We need conclusive evidence!deeply-bound kaonic nuclear states exist?

  • *L vtxK-pp vtxppp-n~1300MeV/c~400MeV/c~150MeV/c~500MeV/cExpected Kinematics for K-pp Decayppp-binding energy = 100MeV/c2Isotropic decay of K-pp with forward neutronCalculated using Geant4

  • *Hodoscope Counter (CDH)expected pID using ToF measurements CDH system has been mounted inside the Solenoid MagnetCDH is used for the charged trigger and particle identification.Plastic Scintillator : 99x30x700 mm3 WTLConfiguration : 36 modulesPMT: Hamamatsu H8409 (fine mesh) x 72sint = 76psecFeb. 2009

  • *Kaon Decay Veto Counterreduce fake triggers caused by decay of K- beamrequirements for the detectorinside CDC & magnetic fieldsmall and compactplastic scintillators embedded with wavelength shifting (WLS) fibers are in progressFeb. 5-8, 2008test experiment atLNS, Tohoku Univ., Japan

  • *Detailed Cell Configuration

  • *Calculated using Geant4generated at the center of CDS0
  • *invariant mass resolution for K-pp and Lmomentum resolution for p, K, pCalculated using Geant4Expected Spectrometer PerformanceInvariant mass of Lp (MeV)S0 channelL channelGK-pp= 60 MeVwe can distinguish the two non-mesonic decay modes for K-ppK-pp Lp pp-p K-pp S0p gLp gpp-p

    mass resolutionK-ppLpLpp-w/o chamber-resolution5.8 MeV/c21.6MeV/c2w/ chamber-resolution18.7MeV/c22.5MeV/c2

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