[Table of Contents]

Plasma and Fusion Research

Volume 2, 034 (2007)

Rapid Communications

Observation of Competition between Drift Instability and Flute Instability in a Bounded Linear ECR Plasma
Kunihiro KAMATAKI, Yoshihiko NAGASHIMA1), Shunjiro SHINOHARA, Yoshinobu KAWAI1), Sigeru INAGAKI1), Masatoshi YAGI1), Kimitaka ITOH2) and Sanae-I. ITOH1)
Interdisciplinary Graduate School of Engineering Science, Kyushu University
1)
Research Institute for Applied Mechanics, Kyushu University
2)
National Institute for Fusion Science
(Received 25 April 2007 / Accepted 29 May 2007 / Published 13 July 2007)

Abstract

Competition behavior between the drift instability and the flute instability has been investigated experimentally in a bounded linear electron cyclotron resonance (ECR) plasma. Time evolutions of the fluctuation in ion saturation currents clearly show the successive appearance of the two instabilities. The drift instability is excited first, then the flute instability appears along with the suppression of the drift instability, and finally, both fluctuations are stabilized. The cyclic competition process in these instabilities continues periodically, and is closely related to the radial density profile.

Keywords

drift wave, flute wave, turbulence, ECR plasma

DOI: 10.1585/pfr.2.034

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References

  • [1] K. Itoh, S.-I. Itoh and A. Fukuyama, Transport and Structural Formation in Plasmas (IOP, Bristol, 1999).
  • [2] Y. Nagashima et al., Plasma Phys. Control. Fusion 48, A377 (2006).
  • [3] P.H. Diamond et al., Plasma Phys. Control. Fusion 47, R35 (2005).
  • [4] K. Kamataki et al., J. Phys. Soc. Jpn. 76, 054501 (2007).

This paper may be cited as follows:

Kunihiro KAMATAKI, Yoshihiko NAGASHIMA, Shunjiro SHINOHARA, Yoshinobu KAWAI, Sigeru INAGAKI, Masatoshi YAGI, Kimitaka ITOH and Sanae-I. ITOH, Plasma Fusion Res. 2, 034 (2007).