Application of millimeter-wave imaging system to LHD

DOI PDF 被引用文献6件
  • A. Mase
    Advanced Science and Technology Center for Cooperative Research, Kyushu University, Kasuga 816-8580, Japan
  • M. Ohashi
    Advanced Science and Technology Center for Cooperative Research, Kyushu University, Kasuga 816-8580, Japan
  • A. Yamamoto
    Advanced Science and Technology Center for Cooperative Research, Kyushu University, Kasuga 816-8580, Japan
  • H. Negishi
    Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
  • N. Oyama
    Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
  • Y. Nagayama
    National Institute for Fusion Science, Toki 509-5292, Japan
  • K. Kawahata
    National Institute for Fusion Science, Toki 509-5292, Japan
  • K. Watabe
    Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
  • K. Mizuno
    Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
  • H. Matsuura
    R & D Department 1, TERATEC Co., Musashino 180-0006, Japan
  • K. Uchida
    R & D Department 1, TERATEC Co., Musashino 180-0006, Japan
  • A. Miura
    R & D Department 1, TERATEC Co., Musashino 180-0006, Japan

抄録

<jats:p>Millimeter-wave imaging systems in the frequency range of 70–140 GHz have been developed for diagnostics of magnetically confined plasmas. The 70 GHz imaging system successfully measures time evolutions of both radial and axial profiles of line density and electron cyclotron emission (ECE) in a tandem mirror. The imaging system is being installed in Large Helical Device (LHD) at the National Institute for Fusion Science. In order to cover the frequency range of the second harmonic ECE on LHD, a new detector using monolithic microwave integrated circuit technology has been designed and fabricated. The detector consists of the integration of a receiving antenna, a down-converting mixer diode, and an intermediate frequency amplifier on a GaAs substrate chip. The heterodyne response up to 10 GHz was confirmed at 70–140 GHz. The optical system consisting of an ellipsoidal mirror and a flat mirror was designed by using a ray-tracing code and evaluated experimentally at 140 GHz.</jats:p>

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