Simulations of nonlinear interaction between beta-induced Alfvén eigenmode and tearing mode
Simulations of nonlinear interaction between beta-induced Alfvén eigenmode and tearing mode
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DOI：
10.1088/1741-4326/acb802
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Ding Li
中科院分区：
文献类型：
--
作者：
Sizhe Duan;Xiaogang Wang;Huishan Cai;Ding Li
Abstract. The nonlinear interaction between the . m. /. n. =. 2. /. 1. beta-induced Alfvén eigenmode (BAE) and the . m. /. n. =. 2. /. 1. tearing mode (TM) observed in the HL-2A experiment is systematically studied with the hybrid kinetic-magnetohydrodynamic code M3D-K. It is found that the nonlinear growth of TM can lead to a gradient buildup on the magnetic island (MI) edge, and then triggers the destabilization of the linearly-stable BAE. Then, the triggered BAE together with TM can produce a significant redistribution of energetic particles. For BAE linearly-dominant-unstable case, the TM activity results in the inward motion of BAE mode structure, and the BAE can have a delay effect on the MI saturation. Furthermore, a high-frequency axisymmetric . m. /. n. =. 0. /. 0. ‘breathing’ mode is generated by the mode coupling of BAE and TM, agreeing well with the experimental observation, and causes the synchronized periodic oscillation of MI width.
