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S. Tokuda, R. Yoshino, T. Matsumoto,
S. R. Hudson, Y. Kawano, T. Takizuka
Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-0193, JAPAN
Abstract. Simulations have demonstrated that magnetic islands having the
widths expected on the major disruption cause the collisionless loss of the
relativistic electrons, and that the resultant loss rate is high enough to
avoid or to suppress the runaway generation. It is because, for the magnetic
fluctuations in the disruption, the loss of the electron confinement due to
the breakdown of the toroidal momentum conservation overwhelms the runaway
electron confinement due to the phase-averaging effect of relativistic
electrons. Simulation results agree closely with recent experiments on fast
plasma shutdown, showing that it is possible to prevent the generation of
runaway electrons.
IAEA 2001
