Instantaneous Correlation between ELM-like MHD Activity and Abrupt Non-local Reduction of Transport at Internal Transport Barrier Formation in JT-60U High-.BETA.p Plasmas

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  • NEUDATCHIN Sergei
    National Institute for Fusion Science Nuclear Fusion Institute, RRC “Kurchatov Institute”
  • TAKIZUKA Tomonori
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • HAYASHI Nobuhiko
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • ISAYAMA Akihiko
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • SHIRAI Hiroshi
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • FUJITA Takaaki
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • KAMADA Yutaka
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • KOIDE Yoshihiko
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • ITOH Kimitaka
    National Institute for Fusion Science
  • MIURA Yukitoshi
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute

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  • Instantaneous Correlation between ELM-like MHD Activity and Abrupt Non-local Reduction of Transport at Internal Transport Barrier Formation in JT-60U High-βp Plasmas
  • Instantaneous Correlation between ELM like MHD Activity and Abrupt Non local Reduction of Transport at Internal Transport Barrier Formation in JT 60U High ベータ p Plasmas

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Transport evolution in normal and reversed shear JT-60U tokamak plasmas with internal transport barrier (ITB) often occurs via non-local transport bifurcations. In the present paper, we highlight new type of edge-core instantaneous interplay in JT-60U high-βp plasmas. Abrupt in time (ms timescale) and wide in space (˜0.4 of minor radius) reduction of electron heat flux in the core (ITB-event) is correlated in ms timescale with the start of an ELM that creates enhanced level of Hα. This result gives a hint of the control to form the ITB immediately and non-locally by inducing the ELM-like MHD activity.

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