Long Range Temperature Fluctuation in LHD

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Author(s)

    • INAGAKI Shigeru
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan|Itoh Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580, Japan
    • KUBO Shin
    • National Institute for Fusion Science, Toki 502-5292, Japan
    • IDO Takeshi
    • National Institute for Fusion Science, Toki 502-5292, Japan
    • ARAKAWA Hiroyuki
    • Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
    • KOBAYASHI Tatsuya
    • 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|Itoh Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580, Japan
    • TANAKA Kenji
    • National Institute for Fusion Science, Toki 502-5292, Japan
    • SUDO Shigeru
    • National Institute for Fusion Science, Toki 502-5292, Japan
    • KOMORI Akio
    • National Institute for Fusion Science, Toki 502-5292, Japan
    • ITOH Kimitaka
    • Itoh Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580, Japan|National Institute for Fusion Science, Toki 502-5292, Japan
    • IDA Katsumi
    • Itoh Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580, Japan|National Institute for Fusion Science, Toki 502-5292, Japan
    • ITOH Sanae-I.
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan|Itoh Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580, Japan
    • TAMURA Naoki
    • National Institute for Fusion Science, Toki 502-5292, Japan
    • FUJISAWA Akihide
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan|Itoh Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580, Japan

Abstract

We report a detailed correlation technique to identify the long-range temperature fluctuation in the Large Helical Device. Correlation hunting has successfully realized the observation of electron temperature fluctuations, which are characterized by their correlation length comparable to the plasma minor radius, with low frequency of ∼ 1-3 kHz, ballistic radial propagation (at a speed of ∼1 km/s, of the order of diamagnetic drift velocity), spatial mode number of m/n = 1/1 (or 2/1), and amplitude of ∼2% at the maximum. Bicoherence analysis confirmed their nonlinear coupling with local microscopic turbulent fluctuations. This long-range temperature fluctuation is a possible carrier of fast propagation in transport processes observed so far. We also comment on the theoretical interpretation.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research (6), 1402017-1402017, 2011

    The Japan Society of Plasma Science and Nuclear Fusion Research

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