LBNL LC-TPC Activities

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LBNL LC-TPC Activities

• International LC-TPC RD
• Micromegas-based TPC RD
• US-Japan Proposal
• Americal Large TPC Detector

• International LC-TPC RD
• Physics and Detector Simulations
• Micromegas-based TPC RD
• US-Japan TPC RD Proposal
• American Large TPC Detector Design

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International LC-TPC RD
US Japan Europe LC-TPC RD coordination
Takeshi Matsuda KEK Mike Ronan LBNL Ron
Settles DESY/MPI Organize international LC-TPC
RD 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 RD Steering
Committee. Ongoing LC-TPC RD Collaborations
Micromegas-based TPC RD (Berkeley, Orsay
Saclay) GEM-based TPC RD (Berkeley, CERN,
Karlsruhe MPI) TPC DAQ and Analysis
software (Berkeley, Carleton, Montreal
Victoria) TPC Simulation software (Berkeley,
Cornell, SLAC Victoria) US-Japan LC-TPC RD
(Berkeley, KEK, MPI Tokyo)
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American Large TPC Detector Simulations
LCD Modules Hit smearing TPC Pattern
recognition Event display ... LCIO JAS
histograms AIDA tuples
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Micromegas-based TPC RD
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
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Online Event Display
Ar-Iso 5, Vmesh 300 VB 1 Tesla wT 2
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Transverse Diffusion Measurement
Gas Argon CF4 3 E field 200 V/cm
vdrift 9-10 cm/?sec diffusion 400 ?m _at_ 1
cm Micromegas Vmesh 340 V Expected transverse
diffusion For B 3 T and d 50
cm 1 m 2.5 m 188 266 421 ?m Position
resolution limits (1 cm pads) 19 27 42 ?m
Diffusion mm2
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. (B1T) 64 - 13 - 10
?m/sqrt(cm)
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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 gt 243 cm (_at_ 95 conf. level)
0 cm
50 cm
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US-Japan Proposal
Phase I KEK 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 II New composite TPC
New large-area composite TPC dimensions dia.
80 cm, length 80 cm Electronics ALTRO
chip zero suppression, ... Phase III New
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 insulatorthickness 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
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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 Reconstruction 3D 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)