Characteristics of Post-Disruption Runaway Electrons with Impurity Pellet Injection

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  • KAWANO Yasunori
    Japan Atomic Energy Research Institute, Naka Fusion Research Establishment
  • NAKANO Tomohide
    Japan Atomic Energy Research Institute, Naka Fusion Research Establishment
  • ISAYAMA Akihiko
    Japan Atomic Energy Research Institute, Naka Fusion Research Establishment
  • ASAKURA Nobuyuki
    Japan Atomic Energy Research Institute, Naka Fusion Research Establishment
  • TAMAI Hiroshi
    Japan Atomic Energy Research Institute, Naka Fusion Research Establishment
  • KUBO Hirotaka
    Japan Atomic Energy Research Institute, Naka Fusion Research Establishment
  • TAKENAGA Hidenobu
    Japan Atomic Energy Research Institute, Naka Fusion Research Establishment
  • BAKHTIARI Mohammad
    Japan Atomic Energy Research Institute, Naka Fusion Research Establishment
  • IDE Shunsuke
    Japan Atomic Energy Research Institute, Naka Fusion Research Establishment
  • KONDOH Takashi
    Japan Atomic Energy Research Institute, Naka Fusion Research Establishment
  • HATAE Takaki
    Japan Atomic Energy Research Institute, Naka Fusion Research Establishment

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Characteristics of post-disruption runaway electrons with impurity pellet injection were investigated for the first time using the JT-60U tokamak device. A clear deposition of impurity neon ice pellets was observed in a post-disruption runaway plasma. The pellet ablation was attributed to the energy deposition of relativistic runaway electrons in the pellet. A high normalized electron density was stably obtained with nebar/nGW ˜ 2.2. Effects of prompt exhaust of runaway electrons and reduction of runaway plasma current without large amplitude MHD activities were found. One possible explanation for the basic behavior of runaway plasma current is that it follows the balance of avalanche generation of runaway electrons and slowing down predicted by the Andersson-Helander model, including the combined effect of collisional pitch angle scattering and synchrotron radiation. Our results suggested that the impurity pellet injection reduced the energy of runaway electrons in a stepwise manner.

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