NDLI: Results from the JFT-2 M Tokamak : Observation of Drift Wave-Zonal Flow Systems

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Results from the JFT-2 M Tokamak : Observation of Drift Wave-Zonal Flow Systems

Content Provider	Semantic Scholar
Author	Nagashima, Yoshihiko Hoshino, Katsumichi Nagaoka, Kenichi Shinohara, Kouji Fujisawa, Akihide Uehara, Kazuya Kusama, Yoshinori Yoshimura, Yasuo Okamura, Shoichi Matsuoka, Keisuke Ejiri, Akira Takase, Yuichi Itoh, Kimitaka Yagi, Masatoshi
Copyright Year	2006
Abstract	This paper presents experimental studies of nonlinear processes between meso-scale structures and turbulent fluctuations, by use of bispectral analysis, in the edge region of toroidal plasmas. In ohmically heated plasmas of the JFT-2M tokamak, the drift wave-zonal flow system is investigated by observation of the potential fluctuations. The total bicoherence is composed of two components, i.e., the peak at the geodesic acoustic mode (GAM) frequency and broadband distribution. The biphase is also obtained, which indicates the phase angle of coherent interaction between GAM oscillations and broadband fluctuations. Bispectral functions (e.g., magnitude and phase) give an order-of-estimate agreement for the drift wave-zonal flow systems. Bicoherence analysis is also applied to the edge plasmas of the high-confinement mode (H-mode) of the Compact Helical System (CHS). In the case of CHS plasmas, nonlinear couplings in a system composed of coherent global magneto-hydrodynamic (MHD) oscillations and broadband fluctuations (up to hundreds kHz range) have been observed. Bispectral analysis enhances our understanding of the self-regulation systems of various toroidal plasmas in which strong turbulence and meso-scale structures coexist. c © 2006 The Japan Society of Plasma Science and Nuclear Fusion Research
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.jspf.or.jp/PFR/PDF/pfr2006_01-041.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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