题   目：Simulations of nonlinear interaction between beta-induced Alfven eigenmode and tearing mode

报告人：蔡辉山教授，中国科学技术大学

时   间：2023年03月01日（周三） 上午 9：30 

地   点：聚变所二楼大会议室、兴隆湖五楼会议室（远程）

摘   要：The nonlinear interaction between the m/n=2/1 beta-induced Alfven eigenmode (BAE) and the m/n=2/1 tearing mode (TM) observed in the HL-2A experiment is systematically studied with the hybrid kinetic-MHD 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 (BM) 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.

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