[Table of Contents]

Plasma and Fusion Research

Volume 10, 3401060 (2015)

Regular Articles

Analysis of Ion-Temperature-Gradient Instabilities Using a Gyro-Fluid Model in Cylindrical Plasmas
Genryu HATTORI, Naohiro KASUYA1) and Masatoshi YAGI2)
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan
1)
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan
2)
Japan Atomic Energy Agency, 2-166 Omotedate, Obuchi, Rokkasho-mura, Aomori 039-3212, Japan
(Received 25 November 2014 / Accepted 2 March 2015 / Published 26 May 2015)

Abstract

The excitation condition for ion-temperature-gradient (ITG) instabilities in linear devices is investigated using a gyro-fluid equation. The finite-Larmor-radius effect is included in the model, which helps to stabilize ITG instabilities. The critical values of η, which is the ratio of the lengths of the density gradient to the temperature gradient, are obtained. Although the modenumbers of the most unstable modes are different with different discharge gases, their critical values have almost the same η level close to 1.0. The results are compared with those from the Hamaguchi-Horton model numerically and analytically.

Keywords

ion-temperature-gradient instability, finite-Larmor-radius effect, gyro-fluid equation, linear device

DOI: 10.1585/pfr.10.3401060

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This paper may be cited as follows:

Genryu HATTORI, Naohiro KASUYA and Masatoshi YAGI, Plasma Fusion Res. 10, 3401060 (2015).