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Multiple-Instabilities in Magnetized Plasmas with Density Gradient and Velocity Shears

Makoto SASAKI^1,2), Naohiro KASUYA^1,2), Shinichiro TODA³⁾, Takuma YAMADA^2,4), Yusuke KOSUGA^1,2), Hiroyuki ARAKAWA⁵⁾, Tatsuya KOBAYASHI³⁾, Shigeru INAGAKI^1,2), Akihide FUJISAWA^1,2), Yoshihiko NAGASHIMA^1,2), Kimitaka ITOH^2,3,6) and Sanae-I ITOH^1,2)

1)

Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan

2)

Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580, Japan

3)

National Institute for Fusion Science, Toki 509-5292, Japan

4)

Faculty of Arts and Science, Kyushu University, Fukuoka 819-0395, Japan

5)

Teikyo University, Fukuoka 836-8505, Japan

6)

Institute of Science and Technology Research, Chubu University, Kasugai 487-8501, Japan

(Received 24 May 2017 / Accepted 28 August 2017 / Published 16 October2017)

Abstract

Multiple free energy sources for instabilities coexist in magnetized plasmas with density gradient and velocity shear. Linear stabilities are investigated, and the mutual relation between resistive drift wave, D'Angelo mode and flute mode is systematically clarified. By evaluating the linear growth rates, dominant instability is categorized in a parameter space. The parallel wavenumber spectrum could be used as a guideline for the identification of the instabilities.

Copyright (c) 2017 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

stability, flow shear, turbulence, transport, drift wave, D'Angelo mode, flute mode

DOI: 10.1585/pfr.12.1401042

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