Manufacturing and Leak Check of Shell Targets for the FIREX-I Project

DOI Web Site 2 Citations 3 References
  • FUJIMURA Takeshi
    Institute of Laser Engineering (ILE), Osaka University, 2-6 Yamada-oka, Osaka 565-0871 Japan
  • NAKAI Mitsuo
    Institute of Laser Engineering (ILE), Osaka University, 2-6 Yamada-oka, Osaka 565-0871 Japan
  • IWAMOTO Akifumi
    National Institute for Fusion Science (NIFS), 322-6 Oroshi-cho, Toki, Gifu 509-0292, Japan
  • NAGAI Keiji
    Institute of Laser Engineering (ILE), Osaka University, 2-6 Yamada-oka, Osaka 565-0871 Japan
  • HOMMA Hirofumi
    Institute of Laser Engineering (ILE), Osaka University, 2-6 Yamada-oka, Osaka 565-0871 Japan
  • TANABE Ken-ichi
    Institute of Laser Engineering (ILE), Osaka University, 2-6 Yamada-oka, Osaka 565-0871 Japan
  • NORIMATSU Takayoshi
    Institute of Laser Engineering (ILE), Osaka University, 2-6 Yamada-oka, Osaka 565-0871 Japan

Abstract

This article reports the latest progress in the manufacture of shell targets used for the first stage of the Fast Ignition Realization Experiment (FIREX-I). In the project, the targets are cooled to cryogenic temperature and filled with hydrogen isotope fuel through a gas feed tube. If the target has a leak or the gas feeder is blocked, the experiments cannot be carried out successfully and waste much time. The authors have developed a system to check integrity of the targets. SF6 is used instead of H2 or D2 because of its high refractive index and low diffusivity. When SF6 is loaded into the target, the optical path length that passes through a target is longer than that of an evacuated target. The difference can be measured with an interferometer. Analyzing the interference images, it is possible to know whether the gas feeder is blocked and a leak is present. The validity of the system was experimentally confirmed.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 4 S1010-S1010, 2009

    The Japan Society of Plasma Science and Nuclear Fusion Research

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