[Table of Contents]

Plasma and Fusion Research

Volume 3, S1017 (2008)

Regular Articles

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


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).


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

DOI: 10.1585/pfr.3.S1017


  • [1] P.H. Diamond, S.-I. Itoh, K. Itoh and T.S. Hahm, Plasma Phys. Control. Fusion 47, R35 (2005).
  • [2] N. Winsor, J.L. Johnson and J.J. Dawson, Phys. Fluids 11, 2248 (1968).
  • [3] T. Ido, Y. Miura, K. Hoshino, K. Kamiya, Y. Hamada, A. Nishizawa, Y. Kausumi, H. Ogawa, Y. Nagashima, K.S hinohara, Y. Kusama and JFT-2 M group, Nucl. Fusion 46, 512 (2006).
  • [4] K. Itoh, S.-I. Itoh, P.H. Diamond, A. Fujisawa, M. Yagi, T. Watari, Y. Nagashima and A. Fukuyama, Plasma Fusion Res. 1, 037 (2006).
  • [5] M. Sasaki, K. Itoh, A. Ejiri and Y. Takase, Contrib. Plasma Phys. 48, 68 (2008).
  • [6] S-I. Itoh, K. Itoh, M. Sasaki, A. Fujisawa, T. Ido and Y. Nagashima, Plasma Phys. Control. Fusion 49, L7-L10 (2007).
  • [7] Zhe. Gao, K. Itoh, H. Sanuki and J.Q. Dong, Phys. Plasmas 13, 100702 (2006).
  • [8] H. Sugama and T.-H. Watanabe, J. Plasma. Phys. 72, 825 (2006).
  • [9] M. Sasaki, K. Itoh, A. Ejiri and Y. Takase, Plasma Fusion Res. 3, 009 (2008).

This paper may be cited as follows:

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