Theory and modeling of electron fishbones
Theory and modeling of electron fishbones
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DOI：
10.1088/1367-2630/18/10/105004
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发表时间：
2016-10
影响因子：
3.3
通讯作者：
G. Vlad;V. Fusco;S. Briguglio;G. Fogaccia;F. Zonca;Xingan Wang
中科院分区：
文献类型：
--
作者：
G. Vlad;V. Fusco;S. Briguglio;G. Fogaccia;F. Zonca;Xingan Wang
内部扭结不稳定性表现出鱼骨状的行为已被观察到在各种实验中的高能量的电子人口，产生强辅助加热和/或电流驱动系统，存在。在简要回顾了高能电子驱动鱼骨的实验证据以及电子鱼骨的线性和非线性理论的主要结果之后，将给出全局、自洽、非线性混合MHD-Gyrokinetic模拟的结果。为此，将使用扩展/混合MHD-Gyrokinetic代码XHMGC。线性动力学分析将启发的效果，考虑动力学热离子的可压缩性和抗磁响应，和动力学热电子的可压缩性，除了高能电子的贡献。非线性饱和和高能电子传输也将得到解决，广泛使用的哈密顿映射技术，讨论中心峰值和离轴峰值高能电子配置文件。它将被证明，中央峰值高能电子档案的特点是共振激发和非线性响应的深度捕获的高能电子。另一方面，离轴峰值高能电子分布的特征在于几乎没有循环的高能电子经历其运动的环形进动反转的共振激发和非线性响应。
Internal kink instabilities exhibiting fishbone like behavior have been observed in a variety of experiments where a high energy electron population, generated by strong auxiliary heating and/or current drive systems, was present. After briefly reviewing the experimental evidences of energetic electrons driven fishbones, and the main results of linear and nonlinear theory of electron fishbones, the results of global, self-consistent, nonlinear hybrid MHD-Gyrokinetic simulations will be presented. To this purpose, the extended/hybrid MHD-Gyrokinetic code XHMGC will be used. Linear dynamics analysis will enlighten the effect of considering kinetic thermal ion compressibility and diamagnetic response, and kinetic thermal electrons compressibility, in addition to the energetic electron contribution. Nonlinear saturation and energetic electron transport will also be addressed, making extensive use of Hamiltonian mapping techniques, discussing both centrally peaked and off-axis peaked energetic electron profiles. It will be shown that centrally peaked energetic electron profiles are characterized by resonant excitation and nonlinear response of deeply trapped energetic electrons. On the other side, off-axis peaked energetic electron profiles are characterized by resonant excitation and nonlinear response of barely circulating energetic electrons which experience toroidal precession reversal of their motion.