Bispectral Analysis of Density and Potential Fluctuations in a High Neutral Density Cylindrical Plasma
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概要
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The structure of fluctuations in the Large Mirror Device-Upgrade (LMD-U) depends on the neutral density. In this study, we focus on the high neutral density plasma in which the potential and density fluctuation waveforms are nontrigonometric functions similar to sawtooth waves, and peaks in the power spectrum lie along a straight line when plotted as frequency versus wavenumber. Two-dimentional auto and cross bispectral analyses of Iis and/or Vf, which consider both the matching conditions for both the azimuthal wavenumber and the frequency, have been performed; significant couplings are observed at particular peak frequencies. Similarities and differences between the auto and cross bicoherence of Iis and/or Vf are discussed.
著者
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Yamada Takuma
Graduate School Of Frontier Science University Of Tokyo
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KASUYA Naohiro
National Institute for Fusion Science
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Itoh Sanae
Research Institute For Applied Mechanics Kyushu University
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Inagaki Shigeru
Research Institute For Applied Mechanics Kyushu University
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Yagi Masatoshi
Research Instittue For Applied Mechanics Kyushu University
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Itoh Kimitaka
National Inst. For Fusion Sci. Gifu
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Fujisawa Akihide
Research Institute For Applied Mechanics Kyushu University
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ARAKAWA Hiroyuki
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan
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KAMATAKI Kunihiro
Interdisciplinary Graduate School of Engineering Science, Kyushu University
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KOBAYASHI Tatsuya
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
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NAGASHIMA Yoshihiko
Graduate School of Frontier Science, The University of Tokyo, Kashiwa 277-8561, Japan
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SUGITA Satoru
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan
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