Coexistence of Zonal Flows and Drift-Waves in a Cylindrical Magnetized Plasma

Yoshihiko Nagashima; Sanae-I. Itoh; Shunjiro Shinohara; Masayuki Fukao; Akihide Fujisawa; Kenichiro Terasaka; Yoshinobu Kawai; Naohiro Kasuya; George R. Tynan; Patrick H. Diamond; Masatoshi Yagi; Shigeru Inagaki; Takuma Yamada; Kimitaka Itoh

doi:10.1143/jpsj.77.114501

Yoshihiko Nagashima, Sanae-I. Itoh, Shunjiro Shinohara ^†, Masayuki Fukao ^†, Akihide Fujisawa, Kenichiro Terasaka, Yoshinobu Kawai, Naohiro Kasuya, George R. Tynan, Patrick H. Diamond, Masatoshi Yagi, Shigeru Inagaki, Takuma Yamada, Kimitaka Itoh

Author information

Yoshihiko Nagashima
Research Institute for Applied Mechanics, Kyushu University
Sanae-I. Itoh
Research Institute for Applied Mechanics, Kyushu University
Shunjiro Shinohara ^†
Interdisciplinary Graduate School of Engineering Science, Kyushu University
Masayuki Fukao ^†
Akihide Fujisawa
National Institute for Fusion Science
Kenichiro Terasaka
Interdisciplinary Graduate School of Engineering Science, Kyushu University
Yoshinobu Kawai
Research Institute for Applied Mechanics, Kyushu University
Naohiro Kasuya
National Institute for Fusion Science
George R. Tynan
Center for Energy Research, University of California, San Diego
Patrick H. Diamond
Center for Astrophysics and Space Sciences, University of California, San Diego
Masatoshi Yagi
Research Institute for Applied Mechanics, Kyushu University
Shigeru Inagaki
Research Institute for Applied Mechanics, Kyushu University
Takuma Yamada
Graduate School of Frontier Science, University of Tokyo
Kimitaka Itoh
National Institute for Fusion Science
Author contributions

†These authors contributed equally: Shunjiro Shinohara, Masayuki Fukao

Keywords: turbulence, drift-wave, zonal flow, linear magnetized plasma, envelope analysis, bispectral analysis

JOURNAL RESTRICTED ACCESS

2008 Volume 77 Issue 11 Pages 114501

DOI https://doi.org/10.1143/jpsj.77.114501

Details

Abstract

Spatiotemporal structures of fluctuations with frequencies lower than the ion cyclotron frequency in a cylindrical magnetized plasma are investigated. Drift-wave and low-frequency zonal flow coexist. Electrostatic potentials of the zonal flow and the drift-wave are distributed widely in radius. The radial wave number profile of the zonal flow has a shear structure at the radial location where the drift-wave has a maximal normalized fluctuation amplitude. On the other hand, the radial wave number profile of the drift-wave shows vortex tilting, resulting in the generation of stationary turbulence Reynolds stress gradient per mass density. The envelope and bispectral analyses indicate significant nonlinear interactions between the zonal flow and the drift-wave.

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