[Table of Contents]

Plasma and Fusion Research

Volume 1, 034 (2006)

Rapid Communications


High Frequency Alfvén Eigen Modes Observed in LHD
Hiroyuki HIGAKI, Makoto ICHIMURA, Daisuke INOUE, Ken-ichiro NAKAGOME, Yuusuke YAMAGUCHI, Shingo KAKIMOTO, Ryuhei KUMAZAWA1), Tetsuo WATARI1), Takashi MUTOH1), Tetsuo SEKI1) and Kenji SAITO1)
Plasma Research Center, University of Tsukuba
1)
National Institute for Fusion Science
(Received 26 December 2005 / Accepted 12 May 2006 / Published 10 July 2006)

Abstract

Alfvén eigen modes were observed in the Large Helical Device for various magnetic field strengths and plasma densities. It was found that Alfvén eigen modes could be excited at much higher frequencies (0.5 ˜ 2.5 MHz) and higher magnetic fields (1.5 ˜ 2.83 T) than previously reported. A part of the estimated Alfvén velocities (2 ˜ 6 × 107 m/s) exceeded the thermal velocity of injected neutral beams (˜ 4.1 × 106 m/s).


Keywords

Alfvén eigen mode, Alfvén velocity, neutral beam injection, Large Helical Device

DOI: 10.1585/pfr.1.034


References

  • [1] G.A. Cottrell and R.O. Dendy, Phys. Rev. Lett. 60, 33 (1988).
  • [2] S. Yamamoto, K. Toi, N. Nakajima et. al., Phys. Rev. Lett. 91, 245001 (2003).
  • [3] S. Yamamoto, K. Toi, S. Ohdachi et. al., Nucl. Fusion 45, 326 (2005).

This paper may be cited as follows:

Hiroyuki HIGAKI, Makoto ICHIMURA, Daisuke INOUE, Ken-ichiro NAKAGOME, Yuusuke YAMAGUCHI, Shingo KAKIMOTO, Ryuhei KUMAZAWA, Tetsuo WATARI, Takashi MUTOH, Tetsuo SEKI and Kenji SAITO, Plasma Fusion Res. 1, 034 (2006).