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LBNL LC-TPC Activities

International LC-TPC R&D Micromegas-based TPC R&D US-Japan Proposal Americal Large TPC Detector. LBNL LC-TPC Activities. International LC-TPC R&D Physics and Detector Simulations Micromegas-based TPC R&D US-Japan TPC R&D Proposal American Large TPC Detector Design.

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LBNL LC-TPC Activities

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  1. International LC-TPC R&D • Micromegas-based TPC R&D • US-Japan Proposal • Americal Large TPC Detector LBNL LC-TPC Activities • International LC-TPC R&D • Physics and Detector Simulations • Micromegas-based TPC R&D • US-Japan TPC R&D Proposal • American Large TPC Detector Design

  2. International LC-TPC R&D US – Japan – Europe LC-TPC R&D coordination: Takeshi Matsuda KEK Mike Ronan LBNL Ron Settles DESY/MPI Organize international LC-TPC R&D meetings, e.g. Jan. 2001 Carleton - following American LC Chicago meeting Sep. 2002 KEK - following International LCWS meeting at Jeju Is., Korea Oct. 2003 LBNL - following Berkeley TPC Symposium Apr. 2004 Paris - before International LCWS in Paris American Large TPC Detector Layed out conceptual design and wrote LCD reconstruction software. Studied physics performance and LC background sensitivity. TESLA-TPC Contributed to TPC design in TESLA TDR. Member of European LC-TPC R&D Steering Committee. Ongoing LC-TPC R&D Collaborations: Micromegas-based TPC R&D (Berkeley, Orsay & Saclay) GEM-based TPC R&D (Berkeley, CERN, Karlsruhe & MPI) TPC DAQ and Analysis software (Berkeley, Carleton, Montreal & Victoria) TPC Simulation software (Berkeley, Cornell, SLAC & Victoria) US-Japan LC-TPC R&D (Berkeley, KEK, MPI & Tokyo)

  3. American Large TPC Detector Simulations LCD Modules: Hit smearing TPC Pattern recognition Event display ... LCIO JAS histograms AIDA tuples

  4. Micromegas-based TPC R&D Berkeley Saclay Orsay Chamber diameter 50 cm length 50 cm Readout anode pad plane 1024 pads Mesh 2x10 mm2 pads 1x10 mm2 pads 50 m pitch 50 m gap

  5. Online Event Display Ar-Iso 5%, Vmesh = 300 VB = 1 Tesla wT ~ 2

  6. Transverse Diffusion Measurement GasArgon CF4 3% E field 200 V/cm vdrift 9-10 cm/sec diffusion ~400 m @ 1 cm Micromegas Vmesh 340 V Expected transverse diffusion For B = 3 T and d = 50 cm1 m2.5 m 188 266 421 m Position resolution limits (1 cm pads) 19 27 42 m Diffusion [mm^2] B = 1 Tesla B fieldDiff. ( m/sqrt(cm)) 0 T 0 400 0.5 T 2.5 150 1 T 5 80 2 T 10 40 3 T 15 27 4 T 20 20 Distance Measure Diff. (B=1T) = 64 +- 13 +- 10 m/sqrt(cm)

  7. Attenuation Measurement Attenuation vs. drift time Ar-CF4 attenuation check: Use all 10 pad rows. Calculate truncated mean. Plot average track TrMean in several drift time bins. Find no significant attenuation in low field (200V/cm) drift volume. TrMean Att. Length > 243 cm (@ 95% conf. level) 0 cm 50 cm

  8. G10 doubler (thin) Rohacell Foam ~25mm Plated Thru Holes Shorts Outer Stripes to corresponding inner stripes US-Japan Proposal Phase IKEK TPC Testing w/ MPI Munich MPI TPC Chamber dimensions dia. 25 cm readout options: Wire or GEM Electronics STAR FEE cards 256 channels New VME readout module Magnet thin coil 1.2 T large bore 80 cm KEK test beam Phase IINew composite TPC New large-area composite TPC dimensions dia. 80 cm, length 80 cm Electronics ALTRO chip zero suppression, ... Phase IIINew electronics Next generation RO electronics new chip design New versions of MPGD's Field Cage Bonded Assembly EMI Foil ~50-100 Al Carbon Structural Shell (2-3mm) Termination Ring (Al) Termination Ring (Al) G10 insulator—thickness to stand-off required HV 1mm/kV Surface Standoff Ground Stripe HV Stripe Cu-Kapton Double sided flex circuit printed with field degradation stripes backside art helps to ‘pull-down’ charge collected on insulator between stripes in active volume

  9. American Large TPC Detector Design Z() + H(jets) event Large (TPC) reference detector Large TPC Chamber dimensions dia. 2 m, half-length 2.5 m pad layout 144-256 pad rows readout options: Wire or GEM or Micromegas Electronics Next generation over 1M channels Magnet outside cal. 3-4 T Reconstruction3D Pattern Recognition LCD Java Framework modular design TPC Simulation smear space points with 100-140 m resolution no-detector effects Tracking efficiency ~ 99% Hits: TPC (cyan), EM Cal (blue) Tracks (red), Clusters (green)

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