Simulations of toroidal Alfvén eigenmode excited by fast ions on the Experimental Advanced Superconducting Tokamak
Simulations of toroidal Alfvén eigenmode excited by fast ions on the Experimental Advanced Superconducting Tokamak
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实验先进超导托卡马克上快离子激发的环形阿尔文本征模的模拟
DOI：
10.1063/1.5023538
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发表时间：
2018
影响因子：
2.2
通讯作者：
Juan Huang
中科院分区：
文献类型：
--
作者：
Youbin Pei;Nong Xiang;Wei Shen;Youjun Hu;Y. Todo;Deng Zhou;Juan Huang
采用动力学-磁流体动力学（MHD）混合模拟方法研究了实验先进超导托卡马克（EAST）上快离子驱动的环形阿尔芬本征模（TAE）。本文的第一部分介绍了两个动态MHD代码，即MEGA和M3D-K，基于一个现实的EAST平衡的线性基准。参数扫描结果表明，两种编码给出的TAE频率和增长率基本一致。本文的第二部分讨论了用MEGA程序模拟的TAE与快离子的共振相互作用。结果表明，TAE与以平行速度通过的并流颗粒进行能量交换|v| ≥ VA 0/3或|v| VA0/5，其中VA0是磁轴上的阿尔芬速度。还分析了由逆流通过离子引起的TAE失稳，发现其生长速率比顺流离子驱动的TAE小得多。其原因之一是TAE空间的重叠区域被发现。
Kinetic-MagnetoHydroDynamic (MHD) hybrid simulations are carried out to study fast ion driven toroidal Alfven eigenmodes (TAEs) on the Experimental Advanced Superconducting Tokamak (EAST). The first part of this article presents the linear benchmark between two kinetic-MHD codes, namely MEGA and M3D-K, based on a realistic EAST equilibrium. Parameter scans show that the frequency and the growth rate of the TAE given by the two codes agree with each other. The second part of this article discusses the resonance interaction between the TAE and fast ions simulated by the MEGA code. The results show that the TAE exchanges energy with the co-current passing particles with the parallel velocity |v∥|≈VA0/3 or |v∥|≈VA0/5, where VA0 is the Alfven speed on the magnetic axis. The TAE destabilized by the counter-current passing ions is also analyzed and found to have a much smaller growth rate than the co-current ions driven TAE. One of the reasons for this is found to be that the overlapping region of the TAE spatia...