The dynamics of a neoclassical tearing mode (NTM) influenced by energetic ions on EAST
The dynamics of a neoclassical tearing mode (NTM) influenced by energetic ions on EAST
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DOI：
10.1088/0741-3335/58/4/045012
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发表时间：
2016-02
影响因子：
2.2
通讯作者：
E. Li;V. Igochine;L. Xu;T. Shi;H. Zhao;Y. Liu;A. Ti;R. White;J. Zhang;Y. Zhu;
中科院分区：
文献类型：
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作者：
E. Li;V. Igochine;L. Xu;T. Shi;H. Zhao;Y. Liu;A. Ti;R. White;J. Zhang;Y. Zhu;
在2014年的先进超导托卡马克（EAST）实验活动中，中性束注入（NBI）启动时观测到了一系列磁流体动力学（MHD）不稳定性，其中最有趣的是新经典撕裂模（NTM）。证据清楚地表明，一个扭结模式后，目前一个强大的锯齿状（ST类）崩溃离开附近的磁岛的位置扰动，提供了初始种子。高能离子的相互作用使磁岛在岛宽和旋转频率上发生振荡。分析表明，体等离子体仍然主导着NTM的动力学过程，高能离子的轨道漂移引起了极化电流，改变了新经典磁岛的宽度和旋转频率。
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.