T Yamamura

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Publications (2)0 Total impact

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    Article: Cosmic Ray Tests of the Prototype TPC for the ILC Experiment
    K. Ackermann, S Arai, D. C. Arogancia, A.M. Bacala, M. Ball, T Behnke, H Bito, V. Eckardt, K Fujii, T. Fusayasu, [......], T Watanabe, P. Wienemann, R. Wurth, H Yamaguchi, M Yamaguchi, A Yamaguchi, T Yamamura, H Yamaoka, T Yazu, R. Yonamine
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    ABSTRACT: A time projection chamber (TPC) is a strong candidate for the central tracker of the international linear collider (ILC) experiment and we have been conducting a series of cosmic ray experiments under a magnetic field up to 4 T, using a small prototype TPC with a replaceable readout device: multi-wire proportional chamber (MWPC) or gas electron multiplier (GEM). We first confirmed that the MWPC readout could not be a fall-back option of the ILC-TPC under a strong axial magnetic field of 4 T since its spatial resolution suffered severely from the so called E x B effect in the vicinity of the wire planes. The GEM readout, on the other hand, was found to be virtually free from the E x B effect as had been expected and gave the resolution determined by the transverse diffusion of the drift electrons (diffusion limited). Furthermore, GEMs allow a wider choice of gas mixtures than MWPCs. Among the gases we tried so far a mixture of Ar-CF4-isobutane, in which MWPCs could be prone to discharges, seems promising as the operating gas of the ILC-TPC because of its small diffusion constant especially under a strong magnetic field. We report the measured drift properties of this mixture including the diffusion constant as a function of the electric field and compare them with the predictions of Magboltz. Also presented is the spatial resolution of a GEM-based ILC-TPC estimated from the measurement with the prototype. Comment: 4 pages, 8 figures. Preprint submitted to TIPP09 Proceedings
    05/2009;
  • Article: A study with a small prototype TPC for the international linear collider experiment
    K. Ackermann, S Arai, D. C. Arogancia, A.M. Bacala, M. Ball, T Behnke, H Bito, V. Eckardt, K Fujii, T. Fusayasu, [......], T Takahashi, H Tsuji, T Watanabe, P. Wienemann, R. Wurth, H Yamaguchi, M Yamaguchi, A Yamaguchi, T Yamamura, T Yazu
    [show abstract] [hide abstract]
    ABSTRACT: A time projection chamber (TPC) is a strong candidate for the central tracker of the international linear collider (ILC) experiment and we have been conducting a series of cosmic ray experiments under a magnetic field up to 4 T, using a small prototype TPC with a replaceable readout device: multi-wire proportional chamber (MWPC) or gas electron multiplier (GEM). We first confirmed that the MWPC readout could not be a fall-back option of the ILC-TPC under a strong axial magnetic field of 4 T since its spatial resolution suffered severely from the so called E×B effect in the vicinity of the wire planes. The GEM readout, on the other hand, was found to be virtually free from the E×B effect and gave the resolution determined by the transverse diffusion of the drift electrons (diffusion limited). Furthermore, GEMs allow a wider choice of gas mixtures than MWPCs. Among the gases we tried so far a mixture of Ar–CF4-isobutane seems promising as the operating gas of the ILC-TPC because of its small diffusion constant especially under a strong magnetic field. We report the spatial resolution obtained with the GEM readout in this gas mixture. Also presented is the spatial resolution of a GEM-based ILC-TPC estimated from the measurement with the prototype.
    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
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