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TPC R&D status in Japan

TPC R&D status in Japan. Center for Nuclear Study, University of Tokyo. T. Isobe, H. Hamagaki, K. Ozawa, and M. Inuzuka. Contents. Development of a prototype TPC Basic Gas Test of pure CF4 Performance evaluation GEM development. 19, Nov., 2003. TPC/HBD Upgrade Working Group Meeting.

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TPC R&D status in Japan

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  1. TPC R&D status in Japan Center for Nuclear Study, University of Tokyo T. Isobe, H. Hamagaki, K. Ozawa, and M. Inuzuka Contents • Development of a prototype TPC • Basic Gas Test of pure CF4 • Performance evaluation • GEM development 19, Nov., 2003 TPC/HBD Upgrade Working Group Meeting

  2. Development of a prototype TPC Drift region -V • A prototype TPC • 30cm drift length, -30 kV HV • Readout from cathode pads • 20 mm anode wire • 13mm, 9.5mm, 6mm, 2.5mm pad • Designed as GEM can be mounted • Three holes for LASER input • Front End Electronics • Charge sensitive Pre-amp • 300MHz bandwidth • 100MHz 8bit FADC Drift 34cm Readout

  3. Gain 6*10^4 • 5.9 keV X-ray from 55Fe Gain test setup  CF4 needs much higher voltage to detect the suitable signals.

  4. 10cm/μsec @900V/cm/atm CF4 characteristics • Drift velocity and longitudinal diffusion were measured. • N2 LASER (λ=337nm) • Attenuated for single electron source • Input to 3 different positions • Gas condition • 20C,1 atm • H2O = 100ppm • O2= 30ppm 60μm Test system

  5. Performance of TPC Energy loss • Beam Test at KEK(Jun. 2003) • e,π,p,d beam (0.5-2.0GeV/c ) • readout with anode wire (no GEM readout) • Measurement Topics • Position resolution • 100μm resolution along the anode wire direction (2.5mm pad) • 500μm resolution in the drift direction • Double Track Separation • Double track could be identified, when the difference in distance between the tracks in the drift direction was more than 1.5cm • Particle Identification • Estimate that it is able to identify the electron with p < 80MeV/c • 5cm track length, 2 separation Schematic view of the beam test setup

  6. CERN Development of GEM • Two kinds of GEM are tested • GEM from CERN • Sauli group • Wet etching • 100 GΏ between both electrodes • GEM was made in Japan • Univ. of Tokyo and Fuchigami Co. • Plasma etching • 10 GΏ between both electrodes Fuchigami CO. Gain consistent with the results of CERN GEM P10 Ar-CO2 *10^3 Next  Plan to test GEM readout for TPC [V]

  7. Summary & Outlook • Achievements • A prototype TPC was developed. • CF4 characteristics was investigated. • 10cm/μsec drift velocity & 60μm longitudinal diffusion @E=900V/cm • Total performance of TPC with CF4 gas was investigated. • achieved 100μm resolution along the wire direction • GEM was developed using plasma etching method in Japan. • Outlook • Install the GEM as TPC readout • investigate the capability (next year) • Other types of readout pads • Improve the Front End Electronics • Applying for the high density signal (large band width)

  8. Additional slides

  9. CF4 signal • 110n second rise time • ~10 points to obtain the T0. • With 100MHz sampling

  10. Position Resolution 100μm Position resolution in the drift direction and along the anode wire were investigated as a function of drift length, pad size and input angle.

  11. Beam Test(2) Double Track Position resolution Along the wire 100μm Energy loss Drift direction 500μm 80MeV

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