First Ohmic Discharge Assisted with RF Power in QUEST Spherical Tokamak
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概要
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Ohmic plasma currents of up to 17 kA with a discharge duration of 0.32 s have been obtained in the Kyushu University Experiment with Steady-State Spherical Tokamak (QUEST) with the help of electron cyclotron wave (ECW) and cancellation coils (CCs). The CCs, originally installed to create a field null in the plasma breakdown phase, are essential for producing plasma current in QUEST. Although the ohmic coil current is initially biased and then reduced completely to zero to induce the plasma current in 15-20 ms, we demonstrate that the flat top of the plasma current exceeding 20 ms is maintained by the vertical field after the ohmic current is switched off. This type of operation is quite favorable for extending pulsed operation to the steady state by electron Bernstein wave current drive (EBCD).
著者
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Takase Yuichi
Graduate School Of Frontier Sciences The Univ. Of Tokyo
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HASEGAWA Makoto
Research Institute for Applied Mechanics, Kyushu University
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HANADA Kazuaki
Research Institute for Applied Mechanics, Kyushu University
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ZUSHI Hideki
Research Institute for Applied Mechanics, Kyushu University
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SAKAMOTO Mizuki
Research Institute for Applied Mechanics, Kyushu University
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KAWASAKI Shoji
Research Institute for Applied Mechanics, Kyushu University
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HIGASHIJIMA Aki
Research Institute for Applied Mechanics, Kyushu University
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Sato Kohnosuke
Research Information Center Institute Of Plasma Physics Nagoya University
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Maekawa Takashi
Graduate School of Energy Science, Kyoto University
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Nakashima Hisatoshi
Research Institute For Applied Mechanics Kyushu University
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Idei Hiroshi
Research Institute For Applied Mechanics Kyushu University
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NISHINO Nobuhiro
Department of Mechanical Engineering, Hiroshima University
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Nakamura Kazuo
Research & Development Division Kikkoman Corporation
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NAKAMURA Kazuo
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
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LIU Hai
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
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SATO Kohnosuke
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
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HIGASHIJIMA Aki
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
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MITARAI Osamu
Liberal Arts Education Center, Kumamoto Campus, Tokai University, 9-1-1 Toroku, Kumamoto 862-8652, Japan
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HIGASHIZONO Yuta
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
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TASHIMA Saya
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
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ISHIGURO Masaki
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
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NAKASHIMA Hisatoshi
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
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TAKASE Yuichi
Graduate School of Frontier Science, University Tokyo, Kashiwa 277-8561, Japan
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ZUSHI Hideki
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
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NISHINO Nobuhiro
Department of Engineering, Hiroshima Univeristy, Higashi-Hiroshima 739-8527, Japan
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HANADA Kazuaki
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
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