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Geodesic Acoustic Modes in Multi-Ion System

Makoto SASAKI, Kimitaka ITOH¹⁾, Akira EJIRI²⁾ and Yuichi TAKASE²⁾

Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan

1)

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

2)

Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan

(Received 2 November 2007 / Accepted 7 February 2008 / Published 6 August 2008)

Abstract

Geodesic acoustic modes (GAMs) in the multi-ion system are investigated. It was found that the high-frequency branch decreases with increase in effective ion mass. The low-frequency branch (ion sound wave, ISW) of the damping rate also becomes small. The ratio between the damping rate of GAM and ISW is found to become order of unity in the region of q < 4 (q is safety factor).

Copyright (c) 2008 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

geodesic acoustic mode, ion sound wave, multi-ion system, impurity

DOI: 10.1585/pfr.3.S1017

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References

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This paper may be cited as follows:

Makoto SASAKI, Kimitaka ITOH, Akira EJIRI and Yuichi TAKASE, Plasma Fusion Res. 3, S1017 (2008).