Recent Progress of Vacuum System for Nuclear Fusion Researh. Vacuum Leak Test Technique of JT-60.

DOI Web Site 3 References
  • KAMINAGA Atsushi
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • ARAI Takashi
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • KODAMA Kozo
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • SASAKI Noboru
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • SAIDOH Masahiro
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute

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Other Title
  • 核融合における最先端真空技術　　臨界プラズマ試験装置（ＪＴ‐６０）のリークテスト技術
  • リンカイ プラズマ シケン ソウチ JT-60 ノ リークテスト ギジュツ

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Abstract

Since a vacuum vessel of JT-60 is very large (167 m3) and is combined with many components, such as magnetic coils, neutral beam injection systems and RF heating systems, etc., the position of leak testing exceeds 700. The two kind of techniques for vacuum leak test used in JT-60 has been described. Firstly the probe helium gas can be fed remotely in the three-dimensionnally sectioned 54 regions of the JT-60 torus. The leak test was very rapidly performed by using this method. Secondly the helium detector system has been modified by the additional installation of the cryopump, which reduced the background level of the deuterium gas. The sensitivity of vacuum leak test with the cryopump was two orders of magnitude larger than that of without it.<BR>The examples of the performed vacuum leak test are stated. The vacuum leaks during experiments were 9 times. They were caused by thermal strain and plasma discharge. The vacuum leaks just after maintenance are 36 times which mainly caused by mis-installation.

Journal

  • Shinku

    Shinku 41 (10), 846-850, 1998

    The Vacuum Society of Japan

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