Plasma and Fusion Research

Volume 3, 047 (2008)

Letters

Observation of Zonal Flow Type Oscillation in Linear Cylindrical ECR Plasmas
Kunihiro KAMATAKI, Sanae -I. ITOH1), Yoshihiko NAGASHIMA2), Shigeru INAGAKI1), Shunjiro SHINOHARA, Masatoshi YAGI1), Takuma YAMADA2), Yoshinobu KAWAI, Akihide FUJISAWA3) and Kimitaka ITOH3)
Interdisciplinary Graduate School of Engineering Science, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
1)
Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
2)
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
3)
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
(Received 3 June 2008 / Accepted 12 July 2008 / Published 20 August 2008)

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.

Keywords

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

DOI: 10.1585/pfr.3.047

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This paper may be cited as follows:

Kunihiro KAMATAKI, Sanae -I. ITOH, Yoshihiko NAGASHIMA, Shigeru INAGAKI, Shunjiro SHINOHARA, Masatoshi YAGI, Takuma YAMADA, Yoshinobu KAWAI, Akihide FUJISAWA and Kimitaka ITOH, Plasma Fusion Res. 3, 047 (2008).