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The dynamics of a neoclassical tearing mode (NTM) influenced by energetic ions on EAST

Erzhong Li, V Igochine, L Xu, T Shi, H Zhao, Y Liu, A Ti, R White, J Zhang, Y Zhu2016年Plasma Physics and Controlled FusionIF 2.2出版社

In the 2014 year's campaign of experimental advanced superconducting tokamak (EAST), a series of Magnetohydrodynamics (MHD) instabilities were observed as the launching of Neutral Beam Injection (NBI), the most interesting one of which is the neoclassical tearing mode (NTM). Evidence clearly shows that a kink mode present after a strong sawtooth-like (ST-like) crash leaves a perturbation near the location of the magnetic island, providing the initial seed. The interaction of energetic ions makes the magnetic island oscillate both in island width and in rotation frequency. Analysis indicates that the bulk plasma still dominates the dynamics of NTM, and the orbit excursion of energetic ions induces a polarization current and modifies the width and rotation frequency of the neoclassical magnetic island.

日本語訳

2014年の実験的先进超伝導トカマク(EAST)におけるキャンペーンにおいて、中性粒子ビーム入射(NBI)の立ち上げに伴い、一連の磁気流体力学(MHD)不安定性が観測された。その中で最も興味深いものは新古典ティアリングモード(NTM)であった。証拠は明確に、強い鋸歯状(ST様)クラッシュ後にキンクモードが存在し、磁気島の位置近傍に摂動を残し、それが初期シードを提供することを示している。高エネルギー粒子の相互作用により、磁気島は島幅と回転周波数の両方において振動を示す。解析により、バルクプラズマが依然としてNTMのダイナミクスを支配していることが示され、一方で高エネルギー粒子の軌道偏移が分極電流を誘起し、新古典磁気島の幅と回転周波数を変調していることが明らかになった。

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EASTEnergetic ionTearing modeNeoclassical tearing mode
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