High Frequency Alfvén Eigen Modes Observed in LHD

Hiroyuki HIGAKI; Makoto ICHIMURA; Daisuke INOUE; Ken-ichiro NAKAGOME; Yuusuke YAMAGUCHI; Shingo KAKIMOTO; Ryuhei KUMAZAWA; Tetsuo WATARI; Takashi MUTOH; Tetsuo SEKI; Kenji SAITO

doi:10.1585/pfr.1.034

Rapid Communications

High Frequency Alfvén Eigen Modes Observed in LHD

Hiroyuki HIGAKI, Makoto ICHIMURA, Daisuke INOUE, Ken-ichiro NAKAGOME, Yuusuke YAMAGUCHI, Shingo KAKIMOTO, Ryuhei KUMAZAWA, Tetsuo WATARI, Takashi MUTOH, Tetsuo SEKI, Kenji SAITO

Author information

Hiroyuki HIGAKI
Plasma Research Center, University of Tsukuba
Makoto ICHIMURA
Plasma Research Center, University of Tsukuba
Daisuke INOUE
Plasma Research Center, University of Tsukuba
Ken-ichiro NAKAGOME
Plasma Research Center, University of Tsukuba
Yuusuke YAMAGUCHI
Plasma Research Center, University of Tsukuba
Shingo KAKIMOTO
Plasma Research Center, University of Tsukuba
Ryuhei KUMAZAWA
National Institute for Fusion Science
Tetsuo WATARI
National Institute for Fusion Science
Takashi MUTOH
National Institute for Fusion Science
Tetsuo SEKI
National Institute for Fusion Science
Kenji SAITO
National Institute for Fusion Science

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

JOURNAL FREE ACCESS

2006 Volume 1 Pages 034

DOI https://doi.org/10.1585/pfr.1.034

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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).

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