Electron and ion transmission of the gating foil for the TPC in the ILC experiment

M. Kobayashi, T. Ogawa, A. Shoji, Y. Aoki, K. Ikematsu, P. Gros, T. Kawaguchi, D. Arai, M. Iwamura, K. Katsuki, A. Koto, M. Yoshikai, K. Fujii, T. Fusayasu, Y. Kato, S. Kawada, T. Matsuda, S. Narita, K. Negishi, H. QiR. D. Settles, A. Sugiyama, T. Takahashi, J. Tian, T. Watanabe, R. Yonamine

Research output: Contribution to journalConference articlepeer-review


We have developed a gating foil for the time projection chamber envisaged as a central tracker for the international linear collider experiment. It has a structure similar to the Gas Electron Multiplier (GEM) with a higher optical aperture ratio and functions as an ion gate without gas amplification. The transmission rate for electrons was measured in a counting mode for a wide range of the voltages applied across the foil using an 55Fe source and a laser in the absence of a magnetic field. The upper limit of the transmission rate for positive ions was estimated to be 3.36 ± 0.05 (stat. only)) × 10-4 from the measured electron transmission at a relatively low reverse bias voltage applied to the foil (ΔV =-15.5 V). The blocking power of the gating foil was confirmed to be high enough to suppress the influence of ion backflow.

Original languageEnglish
Article number012020
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2020 Jun 11
Event6th International Conference on Micro Pattern Gaseous Detectors, MPGD 2019 - La Rochelle, France
Duration: 2019 May 52019 May 10

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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