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High-frequency kinetic modes in the MHz range have been recently observed in several tokamaks during runaway electron (RE) generation, and pitch-angle scattering by them attracts attention to mitigate... RE beam generation. Most of the kinetic mode observations are based on the measurements of oscillating magnetic fields at the wall radius in low field side so far. In the paper, using RF coils installed at high field side and at the inside of a fast movable probe, spatial dependence of kinetic modes appeared in the electron cyclotron (EC) start-up QUEST spherical tokamak (ST) is shown. In addition, a fastresponse detection of intense hard X-rays (extra function of newly developed energetic particle probe) have firstly revealed that fast electron flux is oscillated at the frequencies of the excited kinetic modes, indicating the kinetic picture of fast electrons which drives high-frequency kinetic modes. The new measurements and various results shown together will accelerate the understanding of the dynamics of fast electrons that are important for the development of EC based ST reactor and for the avoidance of generation of runaway electron beam during a disruption.続きを見る
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Mendeley出力
