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 › peer-review

2 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 - 2010

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1585/pfr.5.S2047

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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, 2010.

Research output: Contribution to journal › Article › peer-review

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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title = "Bispectral analysis of density and potential fluctuations in a high neutral density cylindrical plasma",

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.",

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

note = "Funding Information: This work was partly supported by a Grant-in-Aid for Scientific Research (S) from the Japan Society for the Promotion of Science (21224014) and the collaboration programs of RIAM at Kyushu University and the National Institute of Fusion Science (NIFS07KOAP017). Publisher Copyright: {\textcopyright} 2010 The Japan Society of Plasma Science and Nuclear Fusion Research.",

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doi = "10.1585/pfr.5.S2047",

language = "English",

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journal = "Plasma and Fusion Research",

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AU - Kobayashi, Tatsuya

AU - Inagaki, Shigeru

AU - Arakawa, Hiroyuki

AU - Kamataki, Kunihiro

AU - Nagashima, Yoshihiko

AU - Yamada, Takuma

AU - Sugita, Satoru

AU - Yagi, Masatoshi

AU - Kasuya, Naohiro

AU - Fujisawa, Akihide

AU - Itoh, Sanae I.

AU - Itoh, Kimitaka

N1 - Funding Information: This work was partly supported by a Grant-in-Aid for Scientific Research (S) from the Japan Society for the Promotion of Science (21224014) and the collaboration programs of RIAM at Kyushu University and the National Institute of Fusion Science (NIFS07KOAP017). Publisher Copyright: © 2010 The Japan Society of Plasma Science and Nuclear Fusion Research.

PY - 2010

Y1 - 2010

N2 - 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.

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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JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

SN - 1880-6821

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

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