Twenty barrel <i>in situ</i> pipe gun type solid hydrogen pellet injector for the Large Helical Device

  • Ryuichi Sakamoto
    National Institute for Fusion Science , Toki, Gifu 509-5292, Japan
  • Gen Motojima
    National Institute for Fusion Science , Toki, Gifu 509-5292, Japan
  • Hiromi Hayashi
    National Institute for Fusion Science , Toki, Gifu 509-5292, Japan
  • Tomoyuki Inoue
    National Institute for Fusion Science , Toki, Gifu 509-5292, Japan
  • Yasuhiko Ito
    National Institute for Fusion Science , Toki, Gifu 509-5292, Japan
  • Hideki Ogawa
    National Institute for Fusion Science , Toki, Gifu 509-5292, Japan
  • Shigeyuki Takami
    National Institute for Fusion Science , Toki, Gifu 509-5292, Japan
  • Mitsuhiro Yokota
    National Institute for Fusion Science , Toki, Gifu 509-5292, Japan
  • Hiroshi Yamada
    National Institute for Fusion Science , Toki, Gifu 509-5292, Japan

Abstract

<jats:p>A 20 barrel solid hydrogen pellet injector, which is able to inject 20 cylindrical pellets with a diameter and length of between 3.0 and 3.8 mm at the velocity of 1200 m/s, has been developed for the purpose of direct core fueling in LHD (Large Helical Device). The in situ pipe gun concept with the use of compact cryo-coolers enables stable operation as a fundamental facility in plasma experiments. The combination of the two types of pellet injection timing control modes, i.e., pre-programing mode and real-time control mode, allows the build-up and sustainment of high density plasma around the density limit. The pellet injector has demonstrated stable operation characteristics during the past three years of LHD experiments.</jats:p>

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