Transcript Document 7694447

MPI/Desy/Kek TPC Prototype:
Cosmics at Desy, 2-Beam at
Kek
by Ron Settles MPI/DESY
for the MPI, DESY, ASIAN, IPN Orsay groups
listed on next slide
--Steps leading up to tests at Kek
--Beam tests
--Some first preliminary results
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--Next steps
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Asia/Europe TPC Prototype
MPI, DESY, ASIAN, IPN Orsay groups:
(a complete list is in preparation, apologies if some
names missing below…)
MPI
Tscharlie Ackermann, Helmut Schendzielorz, Heinrich Keppeler, et al
Volker Eckardt, Peter Maierbeck, Ron Settles
DESY/HH
Markus Ball, Ties Behnke, Markus Hamann, Rolf Heuer, Matthias Jenssen, Thorsten Kuhl,
Thorsten Lux, Peter Wienemann, et al
ASIA
Keisuke Fujii, Tomohiro Kijima, Makoto Kobayashi, Takeshi Matsuda, Tak Matsui, Osamu Nito,
Tohru Takahashi, Akira Sugiyama, Nobutomo Sakamoto, Takashi Watanabe, Rose Reserva,
Jun Gooc et al from the CDC groups:
Dept. of Physics, Mindanae State University, Ilagan City, Philippines
Department of Physics, Saga University
Department of Quantum Matter, Hiroshima University
Venture Business Laboratory, Hiroshima University
Department of Mathematics and Physics, Kinki University
Department of Applied Physics, Tokyo University of Agriculture and
Technology
Kogakuin University
Department of Physics, University of Tokyo
International Center for Elementary Particle Physics, University of
Tokyo
Institute of Applied Physics, University of Tsukuba, and
Institute of Particle and Nuclear Studies, KEK
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IPN Orsay
Bernard Genolini, JoelRon
Pouthas,
PhilippeALCPG
Rosier,
Vincent Lepeltier et al
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Prototype built in MPI for comparing Wires,
Gem, Micromegas technologies. Tests of wire
version in Desy 5T magnet and in 2 beam at
Kek up to now.
Gem, Micromegas versions in preparation.
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MPI/Desy/KekTPC Prototype
at MPI
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• Pad
plane 100mm x 100mm
• Pad size 2mm x 6mm
• 12 of 16 rows (384 pads) instrumentable
• Wire spacing 2mm (without fieldwires)
• Pad-wire distance 1mm (σ_PRF ~ 1.4mm,
in principle -> to be measured)
• No gating plane for the moment
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MPI/Desy/KekTPC Prototype
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MPI/Desy/KekTPC – first tests at MPI
• First tests “by hand”
• Connection pad-preamp original
flexible circuits problems 
replaced by wires
• Connectors adapted for Aleph
preamps
• Final tests at MPI end Feb 
sent to Desy
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Some steps with Desy/Kek Colleagues
8-9 March
10-28 March
31 March-2 April
12-18 April
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Desy
VE transports MPI TPC to
Set up and test MPI TPC at Desy
MPI chamber working—cosmics taken
Measurments with
cosmics in 5T magnet
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Further steps with Desy/Kek/Asia
Colleagues
Video meetings every 2 weeks
March, April, May
KEK
Early May
May-June
Ship MPI TPC + electronics to
Set up at KEK for test in beam
June 16-July 1
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Keisuke Fujii, Osamu Nito, Katsumasa
Ikemasu at Desy
Beam tests
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2 Hall,
JACEE magnet at KEK
We would like to thank the IPNS cryogenic group lead by Prof. T. Haruyama KEK for their support
for the JACEE magnet operation, Prof. A. Yamamoto the director of the cryogenic center, Dr. Y.
Makida IPNS KEK for having made the JACEE magnet available to us.
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Magnet installation,
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TPC mounting fixture
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Broken wire
Chamber +
had to be fixed
electronics prepared
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Chamber installed in the magnet and centered on
the beam line
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A lot of work went into tuning the beam & the p.i.d.
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Tests in 2 Beam
Experiment T558
• 1-4 Gev/c e, μ, pi,K,p with Č,Aerogel,TOF
• 7 pad rows equipped = 7 × 32 = 224 pads
• Diffusion, resolution, ect measured as
function of drift distance, B field, padcrossing angle.
• dE/dx data taken with p.i.d.
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Measurements in 2 Beam
• ~1000 triggers/setting
• Chamber moved precise distance and
measured V_drift = 4.5cm/μs  1-2%
for “TDR” gas (93%Ar 5%CH4 2%CO2)
• Spread beam to illuminate full chamber
with mult scatt in few-mm-thick Pb plate
• Data taken with B = 0&1T; φ=0,10&20°
• 0.6,1.4,2.0,4.0GeV/c proton (+polarity)
• 1.0,2.0,4.0 GeV/c  (-polarity)
• As function of beam intensity
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• Analyses in progress, some preliminary
results below
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…and a lot of meetings to understand the data…
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Plots by Katsumas Ikematsu
x resolution as function of B, drift distance.
Method: fit track using outer rows, look at
point-track deviation for central row#6
N.B.: this overestimates error (better method in
progress)
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Same for z resolution
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x resolution as function of padcrossing angle, drift distance
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Same for z resolution
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Different crossing angle
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Different crossing angle
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1.39 mm
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N.B. “Layer”  “Pad row”
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Next steps
• Move to Cryo Hall
• Continue testing with cosmics
• Prepare conversion to Gems, Micromegas
• Install Gems around October,
Micromegas later
• Test with cosmics up to April’05
• Continue beam tests
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