LBNL LC-TPC ActivitiesInternational LC-TPC R&D
Micromegas-based TPC R&D
Takeshi Matsuda KEK
Mike Ronan LBNL
Ron Settles DESY/MPI
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
Studied physics performance and LC background sensitivity.
TESLA-TPC
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)
2/9/04
1
LCD Modules:
Hit smearing
2/9/04
1
Micromegas
d = 50 cm 1 m 2.5 m
188 266 421 m
19 27 42 m
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
Diffusion [mm^2]
Calculate truncated mean.
Find no significant attenuation in low field (200V/cm) drift volume.
Attenuation Measurement
MPI TPC Chamber
Electronics
New VME readout module
New large-area composite TPC
Electronics
HV Stripe
Ground Stripe
Carbon Structural Shell (2-3mm)
Field Cage Bonded Assembly
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
Rohacell Foam ~25mm
G10 doubler (thin)
Plated Thru Holes
2/9/04
1
Large (TPC) reference detector
pad layout 144-256 pad rows
readout options: Wire or GEM or Micromegas
Electronics
Magnet
no-detector effects
Tracks (red), Clusters (green)