[Table of Contents]

Plasma and Fusion Research

Volume 10, 3403068 (2015)

Regular Articles

Finite-Orbit-Width Effects on Energetic-Particle-Induced Geodesic Acoustic Mode
Kazuhiro MIKI and Yasuhiro IDOMURA
Japan Atomic Energy Agency, 178-4-4 Wakashiba, Kashiwa, Chiba 277-0871, Japan
(Received 25 November 2014 / Accepted 22 April 2015 / Published 27 July 2015)

Abstract

We identify linear properties of the energetic-particle-induced geodesic acoustic mode (EGAM) using eigenmode analysis based on the gyrokinetic theory. From the perturbed gyrokinetic equation with energetic particles, we derive a dispersion relation of the EGAM. The behaviors of the roots vary depending on the safety factor. Taking into account of the finite-orbit-width (FOW) effects, we examine variations of the growth rates of the EGAM for various beam intensities. The analyses indicate that the FOW effects are small, within several percent of the growth rates, for experimentally relevant radial wave numbers.

Keywords

energetic particle, acoustic wave, gyrokinetics, eigenmode analysis, finite orbit width

DOI: 10.1585/pfr.10.3403068

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This paper may be cited as follows:

Kazuhiro MIKI and Yasuhiro IDOMURA, Plasma Fusion Res. 10, 3403068 (2015).