Bispectral analysis of density and potential fluctuations in a high neutral density cylindrical plasma

Tatsuya Kobayashi; Shigeru Inagaki; Hiroyuki Arakawa; Kunihiro Kamataki; Yoshihiko Nagashima; Takuma Yamada; Satoru Sugita; Masatoshi Yagi; Naohiro Kasuya; Akihide Fujisawa; Sanae I. Itoh; Kimitaka Itoh

doi:10.1585/pfr.5.S2047

Bispectral analysis of density and potential fluctuations in a high neutral density cylindrical plasma

Tatsuya Kobayashi, Shigeru Inagaki, Hiroyuki Arakawa, Kunihiro Kamataki, Yoshihiko Nagashima, Takuma Yamada, Satoru Sugita, Masatoshi Yagi, Naohiro Kasuya, Akihide Fujisawa, Sanae I. Itoh, Kimitaka Itoh

Research output: Contribution to journal › Article

3 Citations (Scopus)

Abstract

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 Ĩ_is and/or VÃ_f , 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 Ĩ_is and/or VÃ_f are discussed.

Original language	English
Article number	S2047
Journal	Plasma and Fusion Research
Volume	5
DOIs	https://doi.org/10.1585/pfr.5.S2047
Publication status	Published - Jan 1 2010

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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Kobayashi, T., Inagaki, S., Arakawa, H., Kamataki, K., Nagashima, Y., Yamada, T., Sugita, S., Yagi, M., Kasuya, N., Fujisawa, A., Itoh, S. I., & Itoh, K. (2010). Bispectral analysis of density and potential fluctuations in a high neutral density cylindrical plasma. Plasma and Fusion Research, 5, [S2047]. https://doi.org/10.1585/pfr.5.S2047

Bispectral analysis of density and potential fluctuations in a high neutral density cylindrical plasma. / Kobayashi, Tatsuya; Inagaki, Shigeru; Arakawa, Hiroyuki; Kamataki, Kunihiro ; Nagashima, Yoshihiko ; Yamada, Takuma; Sugita, Satoru; Yagi, Masatoshi; Kasuya, Naohiro ; Fujisawa, Akihide; Itoh, Sanae I.; Itoh, Kimitaka.

In: Plasma and Fusion Research, Vol. 5, S2047, 01.01.2010.

Research output: Contribution to journal › Article

Kobayashi, Tatsuya ; Inagaki, Shigeru ; Arakawa, Hiroyuki ; Kamataki, Kunihiro ; Nagashima, Yoshihiko ; Yamada, Takuma ; Sugita, Satoru ; Yagi, Masatoshi ; Kasuya, Naohiro ; Fujisawa, Akihide ; Itoh, Sanae I. ; Itoh, Kimitaka. / Bispectral analysis of density and potential fluctuations in a high neutral density cylindrical plasma. In: Plasma and Fusion Research. 2010 ; Vol. 5.

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abstract = "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 Ĩis and/or V{\~A}f , 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 Ĩis and/or V{\~A}f are discussed.",

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AU - Kobayashi, Tatsuya

AU - Inagaki, Shigeru

AU - Arakawa, Hiroyuki

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AU - Nagashima, Yoshihiko

AU - Yamada, Takuma

AU - Sugita, Satoru

AU - Yagi, Masatoshi

AU - Kasuya, Naohiro

AU - Fujisawa, Akihide

AU - Itoh, Sanae I.

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AB - 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 Ĩis and/or VÃf , 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 Ĩis and/or VÃf are discussed.

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