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Observation of Resistive Wall Modes in JT-60U.

  • TAKEJI Satoru
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • TOKUDA Shinji
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • KURITA Genichi
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • SUZUKI Takahiro
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • ISAYAMA Akihiko
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • TAKECHI Manabu
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • OYAMA Naoyuki
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • FUJITA Takaaki
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • IDE Shunsuke
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • ISHIDA Shinichi
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • KAMADA Yutaka
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • OIKAWA Toshihiro
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • SAKAMOTO Yoshiteru
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • TUDA Takashi
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
  • the JT-60 Team
    Naka Fusion Research Establishment, Japan Atomic Energy Research Institute

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Abstract

Resistive wall modes (RWM) associated with ideal magnetohydrodynamic current-driven (βN < 0.2) and pressure-driven (βN > 2.4) kink modes with low toroidal mode number n (n = 1) have been identified in JT-60U. The pressure-driven RWM occurs at the plasma toroidal rotation of about 1% the Alfvén speed without clear continuous slowing down of the plasma toroidal rotation. Occurrence of n = 1 RWMs result in thermal quench accompanied by higher n (n ≥ 2) modes. In the case of current-driven (˜ zero β) RWMs, a thermal quench occurs only at the peripheral region just after the RWM. In contrast, a thermal quench occurs in the whole plasma region following a drastic increase in the growth rate of the RWM from the order of τw-1w is the resistive diffusion time of the wall) to larger than 102 τw-1in the case of pressure-driven (high β) RWMs.

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