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, N. Ghodbane, H. C. Gooc, T. Kijima, M. Hamann, M. Habu, R. D. Heuer, K. Hiramatsu, K. Ikematsu, A. Kaukher, H. KuroiwaM. E. Janssen, Y. Kato, M. Kobayashi, T. Kuhl, T. Lux, T. Matsuda, S. Matsushita, A. Miyazaki, K. Nakamura, O. Nitoh, H. Ohta, J. Pouthas, R. L. Reserva, Ph Rosier, K. Sakai, N. Sakamoto, T. Sanuki, R. Settles, A. Sugiyama, T. Takahashi, T. Tomioka, H. Tsuji, T. Watanabe, P. Wienemann, R. Wurth, H. Yamaguchi, M. Yamaguchi, A. Yamaguchi, T. Yamamura, H. Yamaoka, T. Yazu, R. Yonamine

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


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 ArCF4-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.

Original languageEnglish
Pages (from-to)141-143
Number of pages3
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1
Publication statusPublished - 2010 Nov 1


  • CF
  • GEM
  • ILC
  • MWPC
  • Spatial resolution
  • TPC


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