Transport Dynamics and Multi-Scale Coupling of Turbulence in LHD

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Author(s)

    • SHIMOZUMA Takashi
    • National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
    • NAGAYAMA Yoshio
    • National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
    • KAWAHATA Kazuo
    • National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
    • KOMORI Akio
    • National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
    • FUJISAWA Akihide
    • National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
    • YAGI Masatoshi
    • RIAM, Kyushu University, 6-1 Kasuga-Koen, Kasuga 816-8580, Japan
    • ITOH Sanae-I.
    • RIAM, Kyushu University, 6-1 Kasuga-Koen, Kasuga 816-8580, Japan
    • ITOH Kimitaka
    • National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
    • TAMURA Naoki
    • National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
    • TOKUZAWA Tokihiko
    • National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
    • YAMADA Takuma
    • RIAM, Kyushu University, 6-1 Kasuga-Koen, Kasuga 816-8580, Japan
    • IDA Katsumi
    • National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
    • MARUTA Takashi
    • IGSES, Kyushu University, 6-1 Kasuga-Koen, Kasuga 816-8580, Japan
    • KUBO Shin
    • National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan

Abstract

Spatiotemporal correlation of heat transport and micro- to meso- scale or macro-scale coupling of plasma turbulence are investigated in LHD plasmas, where fast propagation of a cold pulse and a non-local temperature rise are observed. Evidence of a timescale shorter than the diffusion time and a spatial scale longer than the micro-turbulence correlation length between core heat fluxes and edge temperature gradients is found. At the same time, an envelope of turbulent density fluctuations is also found to be modulated. Observation of low frequency (≤ 2 kHz) amplitude modulation of density fluctuation suggests the existence of meso- to macro-scale turbulent structures in the plasma, in which a non-local temperature rise takes place. Relationships between the turbulence with long radial correlation length and the edge-core coupling of heat transport are discussed.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research (3), S1006-S1006, 2008

    The Japan Society of Plasma Science and Nuclear Fusion Research

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