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The Central Tracker of the P ANDA Detector

The Central Tracker of the P ANDA Detector. Andrey Sokolov IKP FZ Jülich, Germany. The X International Conference on Instrumentation for Colliding Beam Physics Novosibirsk, Russia 28.02-5.03.2008. Outline. Overview of FAIR project Layout of PANDA detector PANDA Central Tracker:

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The Central Tracker of the P ANDA Detector

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  1. The Central Tracker of thePANDA Detector Andrey Sokolov IKP FZ Jülich, Germany The X International Conference on Instrumentation for Colliding Beam Physics Novosibirsk, Russia 28.02-5.03.2008

  2. Outline Overview of FAIR project Layout of PANDA detector PANDA Central Tracker: Micro-Vertex Detector Straw Tube Tracker Conclusions and Outlook. Andrey Sokolov 2

  3. Andrey Sokolov

  4. Facility for Antiproton and Ion Research Andrey Sokolov GSI, Darmstadt - heavy ionphysics; - nuclear structure; - atomic and plasma physics; - cancer therapy. FAIR: New facility - heavy ion physics; - higher intensities & energies; - antiproton physics. 4

  5. FAIR Andrey Sokolov Primary Beams • 238U28+: 1012/s @ 1.5-2 Age; • 238U92+: 1010/s @ up to 35 AGeV • Protons : 2 x1013/s @ 30 GeV; up to 90 GeV; • 100-1000 times present intensity. New Existing SIS 100/300 SIS 18 UNILAC FRS ESR Secondary Beams • Broad range of radioactive beams; up to 1.5 - 2 AGeV; • intensity up to 10 000x over present; • Antiprotons 0 - 15 GeV. HESR Super FRS CR Storage and Cooler Rings • Radioactive beams; • e-– A (or p-A) collider; • 1011 stored and cooled antiprotons 0.8 - 14.5 GeV/c; • Future: Polarized antiprotons (?). FLAIR RESR NESR Key Technical Features • Cooledbeams; • Rapidlycycling superconducting magnets; • Parallel Operation. 5

  6. High Energy Storage Ring Andrey Sokolov • Parameters of HESR • Injection of p at 3.7 GeV; • Beam momentum - 1.5-14.5 GeV/c; • Storage ring for internal target operation; • Luminosity up to L~ 2x1032 cm-2s-1; • Beam cooling (stochastic & electron); • Energy resolution down to 4·10-5. PANDA ECM 6

  7. The Physics Overview Charmonium and open charm spectroscopy; Charmed hybrids and glueballs: Many narrow states are predicted; Interaction of charmed particles with nuclei: Meson mass modification in the nuclear matter; Hypernuclei: Double hypernuclei production via Ξ-baryon capture; Many further options: Wide angle compton scattering; Baryon-Antibaryon production; CP-Violation (Λ,D). Andrey Sokolov 7

  8. AntiprotonANnihilations at DArmstadt: PANDA Andrey Sokolov Detector requirements: nearly 4π solid angle for PWA; high rate capability: 2x107 interactions/s; efficient event selection; good momentum resolution ≈ 1%; vertex info for D, K0, Σ, Λ; good PID (γ, e, μ, π, Κ, p); photon detection 1 MeV – 10 GeV. 8

  9. PANDA Detector Andrey Sokolov 9

  10. PANDA Detector Andrey Sokolov Pellet or Cluster Jet Target • Forward Spectrometer • Dipole magnet for forward tracks • Target Spectrometer: • Superconducting solenoid for high pt tracks. 10

  11. PANDA Detector: PID Andrey Sokolov Muon Detectors Forward RICH Barrel DIRC (G.Shepers) Barrel TOF Endcap DIRC Forward TOF 11

  12. PANDA Detector: Calorimeters Andrey Sokolov PWO Calorimeters, (P.Semenov) Forward Shashlyk EMC Hadron Calorimeter 12

  13. PANDA Detector: Tracking Andrey Sokolov Drift Chambers PANDA Central Tracker Micro vertex Detector Tracker GEM Detectors 13

  14. Micro-Vertex Detector: Challenges Provide an information about secondary vertices from charm and strange particles decays: c123μm for D0, c8.71cm for 0  high precision and large sensitive volume; Broad momentum range of the outgoing particles: low material budget to minimize multiple scattering; Asymmetric particle flux due to the fixed target nature of experiment: specific detector layout; Continuous beam operation: triggerless operational mode; High event rate (up to 107evt/s); Particle identification. Andrey Sokolov 14

  15. Micro-Vertex Detector Andrey Sokolov Beam Beam pipe Target pipe 15

  16. Micro-Vertex Detector Andrey Sokolov 4 Barrel Layers 16

  17. Micro-Vertex Detector Andrey Sokolov 6 Forward Disks 17

  18. Micro-Vertex Detector: Pixel Part Andrey Sokolov • Hybrid pixels 100x100 µm2; • 120 modules; • Maximum rate up to 10 Mhits/s/module; • ~10 M channels; • ToT; • 0.15 m2; • ~1% X0 per layer. 18

  19. Andrey Sokolov Micro-Vertex Detector: Pixel Part Front-End chip: ATLAS front end chip as a starting point; Custom pixel front-end chip – TOPIX (TOrino PIXel) in 0.13µm CMOS: TOPIX1 – only analogue part (2005); TOPIX2 – preamp + buffers (2007). Maximum hit rate up to 2 MHits/s  data rate 200Mbit/s; Thickness ~ 200µm. Sensor: Epitaxial silicon sensors: 50µm , 75µm, 100µm under testingin Torino. INFN Torino

  20. MVD: Strip Part Andrey Sokolov • ~400 modules; • ~0.5m2 active area; • ~70.000 readout channels. 20

  21. MVD: Strip Part Microstrip readout: • 128-channel ASIC for strips; • Prototype n-XYTER chip for DETNI (GSI); • Fast timing shaper/amplifier with comparator (1ns time resolution); • Slow channel for analog r/o with peak detector; • Token ring readout of hit channels. • Next iteration with lower power consumption; • Self-triggering operation mode. • Sensor: • Silicon double side strip sensor with pitch 100µm. 29.2.2008 Andrey Sokolov 21

  22. MVD: Spatial resolution Andrey Sokolov 22

  23. MVD: Particle Identification Andrey Sokolov 23

  24. Andrey Sokolov MVD Support Structure It’s planned to build the support structure out of the 2mm Carbon foam.

  25. Andrey Sokolov STT Assembling and Installation

  26. Andrey Sokolov Tracker: TPC Option • Multi-GEM stack for amplification and ion backflow suppression; • Gas: Ne/CO2 (+CH4/CF4); • 100k pads of 2 x 2 mm2; • 50-70µs drift, 700 events overlap. • Simulations: • p/p ~ 1%; • dE/dx resolution ~ 6%. Challenges: • space charge build-up; • continuous sampling; • Field homogeneity better 2%; • ∫Br /Bz dz < 2mm.

  27. Andrey Sokolov Straw Tubes Tracker • ~4100 straws; • 30µmAl-mylar tube, Ø=10mm, l=1.5m; • Rin= 16cm, Rout= 42cm; • Gas filling Ar/10%CO2; • Light detector withX/X0 ~ 1.0-1.3%. Axial layers: • r< 150µm, A ~ 99%; Skewed layers: • z ~ 3mm, A~ 90-95%; Momentum resolution: pt / pt ~ 1.2 %

  28. Andrey Sokolov STT Layout 10mm 1.5m Self-supporting straw layers at ~1 bar overpressure.

  29. PANDA Detector Straw Tube Tracker 29.02.2008 Andrey Sokolov 29

  30. Andrey Sokolov COSY-TOF Straw Tube Tracker • 3120 straw tubesin15 planar double layers ; • Aligned at  = 0°, 60°, 300° for 3d-reconstruction; • Gas: Ar/CO2(10%), p=1.2bar; • Active volume: 1m2x 30cm; • Resolution:r  100 µm; • Efficiency:  99%; • Radiation length: X/X01.3%; • Lowest detector weight ~ 15kg • total stretching force ~ 3200 kg! • Operates in vacuum. 1m

  31. Andrey Sokolov COSY-TOF STT: Cosmic Ray Test limited ionisation clusters near tube wall  Radial efficiency  ~ 98% • Spatial resolution  ~ 100µm

  32. Andrey Sokolov STT Particle Flux Density Recoil protons from the target produce a charge load up to 0.4C/cm/year.

  33. Andrey Sokolov STT Aging Beam Test • 32 straws in doble layer; • 3 gas mixtures: • Ar+10%CO2; • Ar+30%CO2; • Ar+30%C2H6. • Proton beam: • 3GeV/c; • up to 8106 protons/s; • beam spot  ~4cm. • Gas gain .5-1105. • Accumulated charge up to 1.2Q/cm (~3 years of PANDA operation).

  34. Andrey Sokolov STT Aging Test Maximum gain drop less than 10%!

  35. Andrey Sokolov Conclusions FAIR project has been officially started. PANDA will be a versatile detector for charm physics. The design and prototyping of MVD is on the good way: Two prototypes of the front end pixel chip are released. The prototope for the strip front end chip is under construction. The MVD design comprises the good spatial resolution with PID capabilities. The straw tubes is suggested as option forPANDA tracker. Due to the new technique STT will have very low material budget combining with the good spatial resolution and efficiency. The beam test shows sufficient radiation hardness of STT.

  36. Andrey Sokolov Outlook TOPIX3 prototype should be ready by the end of this year; Half-cylinder full length STT prototype should be finished in the next year; The PANDA TDR will be ready in the beginning 2010; PANDA commissioning in 2015.

  37. Andrey Sokolov The PANDA Collaboration More than 420 physicists from 55 institutions in 17 countries U Pavia IHEP Protvino PNPI Gatchina U of Silesia U Stockholm KTH Stockholm U & INFN Torino Politechnico di Torino U Oriente, Torino U & INFN Trieste U Tübingen U & TSL Uppsala U Valencia SMI Vienna SINS Warsaw U Warsaw U & INFN Genova U Glasgow U Gießen KVI Groningen U Helsinki IKP Jülich I + II U Katowice IMP Lanzhou U Mainz U & Politecnico & INFN Milano U Minsk Moscow, ITEP & MPEI TU München U Münster BINP Novosibirsk LAL Orsay U Basel IHEP Beijing U Bochum U Bonn U & INFN Brescia U & INFN Catania Cracow JU,TU, IFJ PAN GSI Darmstadt TU Dresden JINR Dubna (LIT,LPP,VBLHE) U Edinburgh U Erlangen NWU Evanston U & INFN Ferrara U Frankfurt LNF-INFN Frascati

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