Excitation of beta-induced Alfvén eigenmodes by the coupling between geodesic acoustic mode and magnetic island

Nuclear Fushion

article

Huishan Cai¹  Baofeng Gao¹  Ming Xu²  Adi Liu¹  Defeng Kong² 

[1] CAS Key Laboratory of Geospace Environment, School of Nuclear Sciences and Technology, University of Science and Technology of China;Institute of Plasma Physics

关键词: beta induced Alfv´en eigenmodes;    magnetic island;    geodesic acoustic mode;    tearing modes;   

DOI  :  10.1088/1741-4326/abd3e9

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

The mechanism of excitation of beta-induced Alfvén eigenmodes (BAEs) with magnetic islands larger than a threshold without energetic ions is studied. It is found that the nonlinear coupling between geodesic acoustic mode and magnetic islands can drive the pair of BAEs. The phase of BAEs to island should beπ /2 to excite the BAEs and the magnetic island is larger than a threshold. The results are consistent with the experimental results shown in EAST(#86309). It implies that similar experimental results in other tokamaks, that BAEs excitation by magnetic islands without energetic ions, may be from the nonlinear coupling between islands and waves. It also implies that the existence of magnetic islands can make the excitation of BAEs easier in plasma with energetic ions, since the magnetic island can also increase the pressure gradient of energetic ions near the island separatrix. This predicts that BAEs may appear more frequently in the presence of magnetic islands in ITER.

【 授权许可】

Unknown