A study on low-frequency fluctuations using new azimuthal probe array in high-density helicon linear plasma

Kenichiro Terasaka; Shunjiro Shinohara; Yoshihiko Nagashima; Takuma Yamada; Masato Kawaguchi; Takashi Maruta; Shigeru Inagaki; Yoshinobu Kawai; Naohiro Kasuya; Masatoshi Yagi; Akihide Fujisawa; Kimitaka Itoh; Sanae I. Itoh

doi:10.1585/pfr.2.031

A study on low-frequency fluctuations using new azimuthal probe array in high-density helicon linear plasma

Kenichiro Terasaka, Shunjiro Shinohara, Yoshihiko Nagashima, Takuma Yamada, Masato Kawaguchi, Takashi Maruta, Shigeru Inagaki, Yoshinobu Kawai, Naohiro Kasuya, Masatoshi Yagi, Akihide Fujisawa, Kimitaka Itoh, Sanae I. Itoh

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

22 Citations (Scopus)

Abstract

In a high-density plasma produced by helicon waves in a linear device, a change from the coherent to broadband density fluctuations was observed on increasing the magnetic field. The coherent mode exhibited the drift wave features, and a steady oscillation state was observed. When the magnetic field was increased, the fluctuation level increased, and the higher azimuthal Fourier components were excited. When the spectrum became broad at the higher magnetic field, the behavior of the azimuthal structure became complex and changed rapidly with time. The analysis performed using the movable probe array (48ch.-probe) decomposed the short-lived structure into poloidal mode-frequency space and indicated mode-mode coupling in the broad-band spectrum.

Original language	English
Article number	031
Journal	Plasma and Fusion Research
Volume	2
DOIs	https://doi.org/10.1585/pfr.2.031
Publication status	Published - 2007

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1585/pfr.2.031

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title = "A study on low-frequency fluctuations using new azimuthal probe array in high-density helicon linear plasma",

abstract = "In a high-density plasma produced by helicon waves in a linear device, a change from the coherent to broadband density fluctuations was observed on increasing the magnetic field. The coherent mode exhibited the drift wave features, and a steady oscillation state was observed. When the magnetic field was increased, the fluctuation level increased, and the higher azimuthal Fourier components were excited. When the spectrum became broad at the higher magnetic field, the behavior of the azimuthal structure became complex and changed rapidly with time. The analysis performed using the movable probe array (48ch.-probe) decomposed the short-lived structure into poloidal mode-frequency space and indicated mode-mode coupling in the broad-band spectrum.",

author = "Kenichiro Terasaka and Shunjiro Shinohara and Yoshihiko Nagashima and Takuma Yamada and Masato Kawaguchi and Takashi Maruta and Shigeru Inagaki and Yoshinobu Kawai and Naohiro Kasuya and Masatoshi Yagi and Akihide Fujisawa and Kimitaka Itoh and Itoh, {Sanae I.}",

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doi = "10.1585/pfr.2.031",

language = "English",

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journal = "Plasma and Fusion Research",

issn = "1880-6821",

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

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TY - JOUR

T1 - A study on low-frequency fluctuations using new azimuthal probe array in high-density helicon linear plasma

AU - Terasaka, Kenichiro

AU - Shinohara, Shunjiro

AU - Nagashima, Yoshihiko

AU - Yamada, Takuma

AU - Kawaguchi, Masato

AU - Maruta, Takashi

AU - Inagaki, Shigeru

AU - Kawai, Yoshinobu

AU - Kasuya, Naohiro

AU - Yagi, Masatoshi

AU - Fujisawa, Akihide

AU - Itoh, Kimitaka

AU - Itoh, Sanae I.

PY - 2007

Y1 - 2007

N2 - In a high-density plasma produced by helicon waves in a linear device, a change from the coherent to broadband density fluctuations was observed on increasing the magnetic field. The coherent mode exhibited the drift wave features, and a steady oscillation state was observed. When the magnetic field was increased, the fluctuation level increased, and the higher azimuthal Fourier components were excited. When the spectrum became broad at the higher magnetic field, the behavior of the azimuthal structure became complex and changed rapidly with time. The analysis performed using the movable probe array (48ch.-probe) decomposed the short-lived structure into poloidal mode-frequency space and indicated mode-mode coupling in the broad-band spectrum.

AB - In a high-density plasma produced by helicon waves in a linear device, a change from the coherent to broadband density fluctuations was observed on increasing the magnetic field. The coherent mode exhibited the drift wave features, and a steady oscillation state was observed. When the magnetic field was increased, the fluctuation level increased, and the higher azimuthal Fourier components were excited. When the spectrum became broad at the higher magnetic field, the behavior of the azimuthal structure became complex and changed rapidly with time. The analysis performed using the movable probe array (48ch.-probe) decomposed the short-lived structure into poloidal mode-frequency space and indicated mode-mode coupling in the broad-band spectrum.

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DO - 10.1585/pfr.2.031

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SN - 1880-6821

VL - 2

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

M1 - 031

ER -

A study on low-frequency fluctuations using new azimuthal probe array in high-density helicon linear plasma

Abstract

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