Plasma and Fusion Research

Volume 17, 1301106 (2022)

Letters

Formation Process of a Solitary Vortex in a Zonal Flow — Drift-Wave Dynamics
Hiroyuki ARAKAWA, Makoto SASAKI1), Shigeru INAGAKI2,3), Maxime LESUR4), Yusuke KOSUGA3,5), Tatsuya KOBAYASHI6), Fumiyoshi KIN7), Takuma YAMADA3,8), Yoshihiko NAGASHIMA3,5), Akihide FUJISAWA3,5) and Kimitaka ITOH3,6,9)
Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
1)
College of Industrial Technology, Nihon University, Narashino 275-8575, Japan
2)
Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan
3)
Research Centre for Plasma Turbulence, Kyushu University, Kasuga 816-8580, Japan
4)
Université de Lorraine, CNRS, IJL, Nancy F-54000, France
5)
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
6)
National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 502-5292, Japan
7)
National Institutes for Quantum and Radiological Science and Technology, Naka 311-0193, Japan
8)
Faculty of Arts and Science, Kyushu University, Fukuoka 819-0395, Japan
9)
Frontier Research Institute, Chubu University, Kasugai 487-8501, Japan
(Received 11 September 2022 / Accepted 11 October 2022 / Published 24 November 2022)

Abstract

A solitary vortex organization process in drift-wave type fluctuations interacting with the zonal flow was identified experimentally in a linear magnetized plasma. An azimuthal probe array was used to evaluate temporal changes in the amplitude and phase in the density fluctuations. Excitation/damping of the solitary vortex is synchronized with zonal perturbation, and the waveform of drift-wave type fluctuation and its harmonics also changes synchronously. The solitary vortex is formed primarily through the phase modulation of the fundamental drift-wave type fluctuation and its harmonics.

Keywords

magnetized plasma, zonal flow, drift wave, solitary wave, solitary vortex

DOI: 10.1585/pfr.17.1301106

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