Observation of Zonal Flow Type Oscillation in Linear Cylindrical ECR Plasmas

Kunihiro KAMATAKI; Sanae -I. ITOH; Yoshihiko NAGASHIMA; Shigeru INAGAKI; Shunjiro SHINOHARA; Masatoshi YAGI; Takuma YAMADA; Yoshinobu KAWAI; Akihide FUJISAWA; Kimitaka ITOH

doi:10.1585/pfr.3.047

Letters

Observation of Zonal Flow Type Oscillation in Linear Cylindrical ECR Plasmas

Kunihiro KAMATAKI, Sanae -I. ITOH, Yoshihiko NAGASHIMA, Shigeru INAGAKI, Shunjiro SHINOHARA, Masatoshi YAGI, Takuma YAMADA, Yoshinobu KAWAI, Akihide FUJISAWA, Kimitaka ITOH

Author information

Kunihiro KAMATAKI
Interdisciplinary Graduate School of Engineering Science, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
Sanae -I. ITOH
Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
Yoshihiko NAGASHIMA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
Shigeru INAGAKI
Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
Shunjiro SHINOHARA
Interdisciplinary Graduate School of Engineering Science, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
Masatoshi YAGI
Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
Takuma YAMADA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
Yoshinobu KAWAI
Interdisciplinary Graduate School of Engineering Science, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
Akihide FUJISAWA
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
Kimitaka ITOH
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan

Keywords: zonal flow type oscillation, drift wave turbulence, ECR modulation, linear cylindrical ECR plasma

JOURNAL FREE ACCESS

2008 Volume 3 Pages 047

DOI https://doi.org/10.1585/pfr.3.047

Details

Abstract

Zonal flow type oscillation, which is driven by a small modulation of the electron cyclotron resonance (ECR) power in a low-frequency band (< 0.1 kHz), and its impact on drift wave turbulence are observed in linear cylindrical ECR plasmas by simultaneous spatiotemporal measurements with a multi-ring probe array. It is found that a potential low-frequency (< 0.1 kHz) oscillation can have a zonal flow type structure. Bicoherence analysis reveals that this zonal flow type oscillation has a nonlinear interaction with the drift mode. These results indicate that an electric field with zonal flow, which is excited externally, can modulate the drift mode amplitude, similar to spontaneous zonal flow.

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