Experimental Study of Drift Wave Turbulence in Linear Plasmas
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概要
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Linear plasmas allow multi-point, low-temperature measurements with Langmuir probes. We measured ion saturation-current fluctuations of a Large Mirror Device-Upgrade linear plasma using a poloidal Langmuir probe array. By varying the discharge conditions, the spatiotemporal behavior showed a change from a coherent sine wave to a turbulent waveform through a periodic, modulated sine wave. The two-dimensional (poloidal wave number and frequency) power spectrum for each regime showed a single fluctuation peak, a peak and its harmonics, and a number of peaks in the poloidal wave number-frequency space. Bi-spectral analysis was performed for the turbulent regime, and showed the existence of nonlinear couplings among fluctuation peaks and broadband components.
著者
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Nagashima Yoshihiko
Research Institute For Applied Mechanics Kyushu University
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Fujisawa Akihide
National Institute For Fusion Science
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Shinohara Shunjiro
Interdisciplinary Graduate School Of Engineering Science Kyushu University
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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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Kawai Yoshinobu
Research Information Center Institute Of Plasma Physics Nagoya University
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Terasaka Kenichiro
Interdisciplinary Graduate School Of Engineering Science Kyushu University
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YAMADA Takuma
Research Institute for Applied Mechanics, Kyushu University
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MARUTA Takashi
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
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MARUTA Takashi
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
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FUKAO Masayuki
Myojocho, Uji 611-0014, Japan
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FUKAO Masayuki
Myojocho, Uji
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