Spatiotemporal Behavior of Drift Waves in LMD-U

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Author(s)

    • YAMADA Takuma
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
    • KAWAI Yoshinobu
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
    • ITOH Kimitaka
    • National Institute for Fusion Science, Toki 509-5292, Japan
    • ITOH Sanae -I.
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
    • TERASAKA Kenichiro
    • Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
    • NAGASHIMA Yoshihiko
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
    • SHINOHARA Shunjiro
    • Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
    • MARUTA Takashi
    • Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
    • YAGI Masatoshi
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
    • INAGAKI Shigeru
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan

Abstract

In the LMD-U linear magnetized plasma, fluctuation measurements have been performed with multi-channel poloidal Langmuir probe arrays to investigate the spatiotemporal behaviors of drift wave turbulence. Two-dimensional (poloidal mode number-frequency) power spectrum showed not only fluctuation peaks but also the existence of a broadband fluctuation. The broadband fluctuation developed at high poloidal mode number and high frequency regions and not along the linear dispersion relation curve of drift wave modes. It showed shorter correlation time and poloidal length than the peaked fluctuations. Two-dimensional axial coherence was measured with two poloidal probe arrays separated in the axial direction. The axial coherence was strong for both the broadband fluctuation and peak fluctuations, suggesting the quasi-two-dimensional structure of the drift wave turbulence.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research (3), S1021-S1021, 2008

    The Japan Society of Plasma Science and Nuclear Fusion Research

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