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

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MPI/Desy/Kek TPC PrototypeCosmics at Desy,
?2-Beam at Kekby Ron Settles MPI/DESY for
the MPI, DESY, ASIAN, IPN Orsay groupslisted on
next slide
--Steps leading up to tests at Kek --Beam
tests --Some first preliminary results --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

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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 (s_PRF 1.4mm, in
  principle -gt 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 VE transports MPI TPC to
Desy 10-28 March Set up and
test MPI TPC at Desy 31 March-2 April
MPI chamber workingcosmics taken
12-18 April Measurments with
cosmics in 5T magnet
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Cosmics in 5T Magnet at DESY Data being analyzed
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Further steps with Desy/Kek/Asia Colleagues Video
meetings every 2 weeks
March, April, May Keisuke Fujii, Osamu Nito,
Katsumasa
Ikemasu at Desy Early May
Ship MPI TPC electronics to KEK
May-June Set up at KEK for test in
beam June 16-July 1 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, 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 BeamExperiment T558

• 1-4 Gev/c e, µ, pi,K,p with C,Aerogel,TOF
• 7 pad rows equipped 7 32 224 pads
• Diffusion, resolution, ect measured as function
  of drift distance, B field, pad-crossing angle.
• dE/dx data taken with p.i.d.

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T558 Run Sheet
Shift leader/Crew/Comments
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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 (93Ar
  5CH4 2CO2)
• Spread beam to illuminate full chamber with mult
  scatt in few-mm-thick Pb plate
• Data taken with B 01T f0,1020
• 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
• Analyses in progress, some preliminary results
  below

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and a lot of meetings to understand the data
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Very preliminary results on the x resolution by
Jun showed 3 dead preamps (out of 224)
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Some plots by Katsumsa Ikematsu, here the
noise/channel
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x resolution as function of B, drift
distance. Method fit track using outer rows,
look at point-track deviation for central
row6 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 pad-crossing 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 April05
• Continue beam tests

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Conversion to Gems

• Decided to use a 4-Gem stack triple Gem for gas
  amplification, one Gem for gating
• KEK will make a new 'Zwischenflansch' for
  mounting the padplane 4 Gem stack
• New 'Zwischenflansch' will have extra HV
  feedthroughs as proposed by Philippe
  Rosier/Tscharlie Ackermann), to be fabricated at
  Kek
• Decided to remove the last FC ring (rather than
  leave the last one in and mill off some material)
• Need Guardring (Bernard Genolini)
• KEK will manufacture the Gem frames and
  spacers,etc

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Studies with IPN Orsay

• (Joel, Philippe, Bernard, Vincent and others)
• Looking at end-plate mechanics -gt material
  dominated by electronics -gt
• require lt 30 rad. length
• Designed quad-Gem plane for MPI/Desy/Kek
  prototype tests at KEK

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GEM planes for MPI prototype