Spatiotemporal Behavior of Drift Waves in LMD-U
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概要
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In the LMD-U linear magnetized plasma, fluctuation measurements have been performed with multi-channel poloidal Langmuir probe arrays to investigate the spatiotemporal behaviors of drift wave turbulence. Two-dimensional (poloidal mode number-frequency) power spectrum showed not only fluctuation peaks but also the existence of a broadband fluctuation. The broadband fluctuation developed at high poloidal mode number and high frequency regions and not along the linear dispersion relation curve of drift wave modes. It showed shorter correlation time and poloidal length than the peaked fluctuations. Two-dimensional axial coherence was measured with two poloidal probe arrays separated in the axial direction. The axial coherence was strong for both the broadband fluctuation and peak fluctuations, suggesting the quasi-two-dimensional structure of the drift wave turbulence.
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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