On the Nonlinear Coupling of the High Wavenumber Fluctuations Exhibiting the Discrete Spectra Observed in PANTA

Yuichi Kawachi; Makoto Sasaki; Takashi Nishizawa; Yusuke Kosuga; Kenichiro Terasaka; Inagaki Shigeru; Takuma Yamada; Naohiro Kasuya; Chanho Moon; Yoshihiko Nagashima; Akihide Fujisawa

doi:10.1585/PFR.1201031

On the Nonlinear Coupling of the High Wavenumber Fluctuations Exhibiting the Discrete Spectra Observed in PANTA

Yuichi Kawachi, Makoto Sasaki, Takashi Nishizawa, Yusuke Kosuga, Kenichiro Terasaka, Inagaki Shigeru, Takuma Yamada, Naohiro Kasuya, Chanho Moon, Yoshihiko Nagashima, Akihide Fujisawa

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

Abstract

We report on the nonlinear coupling properties of high-wavenumber fluctuation, which exhibits discrete frequency spectra with a frequency span comparable to the ion cyclotron frequency observed in PANTA. Bicoherence analysis is used to investigate this nonlinear coupling. The results indicate a finite coupling between individual discrete peaks but no coupling between the ion cyclotron frequency components of these discrete peaks. This suggests that the observed turbulence with a discrete spectrum is destabilized linearly rather than through nonlinear coupling.

Original language	English
Article number	1201031
Pages (from-to)	1-2
Number of pages	2
Journal	Plasma and Fusion Research
Volume	19
DOIs	https://doi.org/10.1585/PFR.1201031
Publication status	Published - 2024

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1585/PFR.1201031

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title = "On the Nonlinear Coupling of the High Wavenumber Fluctuations Exhibiting the Discrete Spectra Observed in PANTA",

abstract = "We report on the nonlinear coupling properties of high-wavenumber fluctuation, which exhibits discrete frequency spectra with a frequency span comparable to the ion cyclotron frequency observed in PANTA. Bicoherence analysis is used to investigate this nonlinear coupling. The results indicate a finite coupling between individual discrete peaks but no coupling between the ion cyclotron frequency components of these discrete peaks. This suggests that the observed turbulence with a discrete spectrum is destabilized linearly rather than through nonlinear coupling.",

keywords = "high wavenumber turbulence, ion cyclotron ranges of frequency fluctuations, nonlinear interaction",

author = "Yuichi Kawachi and Makoto Sasaki and Takashi Nishizawa and Yusuke Kosuga and Kenichiro Terasaka and Inagaki Shigeru and Takuma Yamada and Naohiro Kasuya and Chanho Moon and Yoshihiko Nagashima and Akihide Fujisawa",

note = "Publisher Copyright: {\textcopyright} 2024 The Japan Society of Plasma Science and Nuclear Fusion Research",

year = "2024",

doi = "10.1585/PFR.1201031",

language = "English",

volume = "19",

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journal = "Plasma and Fusion Research",

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publisher = "The Japan Society of Plasma Science and Nuclear Fusion Research (JSPF)",

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TY - JOUR

T1 - On the Nonlinear Coupling of the High Wavenumber Fluctuations Exhibiting the Discrete Spectra Observed in PANTA

AU - Kawachi, Yuichi

AU - Sasaki, Makoto

AU - Nishizawa, Takashi

AU - Kosuga, Yusuke

AU - Terasaka, Kenichiro

AU - Shigeru, Inagaki

AU - Yamada, Takuma

AU - Kasuya, Naohiro

AU - Moon, Chanho

AU - Nagashima, Yoshihiko

AU - Fujisawa, Akihide

PY - 2024

Y1 - 2024

N2 - We report on the nonlinear coupling properties of high-wavenumber fluctuation, which exhibits discrete frequency spectra with a frequency span comparable to the ion cyclotron frequency observed in PANTA. Bicoherence analysis is used to investigate this nonlinear coupling. The results indicate a finite coupling between individual discrete peaks but no coupling between the ion cyclotron frequency components of these discrete peaks. This suggests that the observed turbulence with a discrete spectrum is destabilized linearly rather than through nonlinear coupling.

AB - We report on the nonlinear coupling properties of high-wavenumber fluctuation, which exhibits discrete frequency spectra with a frequency span comparable to the ion cyclotron frequency observed in PANTA. Bicoherence analysis is used to investigate this nonlinear coupling. The results indicate a finite coupling between individual discrete peaks but no coupling between the ion cyclotron frequency components of these discrete peaks. This suggests that the observed turbulence with a discrete spectrum is destabilized linearly rather than through nonlinear coupling.

KW - high wavenumber turbulence

KW - ion cyclotron ranges of frequency fluctuations

KW - nonlinear interaction

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VL - 19

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JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

M1 - 1201031

ER -

On the Nonlinear Coupling of the High Wavenumber Fluctuations Exhibiting the Discrete Spectra Observed in PANTA

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