Experimental observation of beta-induced Alfvén eigenmodes during strong tearing modes on the EAST tokamak in fast-electron plasmas
Experimental observation of beta-induced Alfvén eigenmodes during strong tearing modes on the EAST tokamak in fast-electron plasmas
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DOI：
10.1088/0741-3335/55/6/065002
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发表时间：
2013-06
影响因子：
2.2
通讯作者：
M. Xu;W. Chen;L. Hu;R. Zhou;G. Zhong;T. Shi;L. Xu;Y. Zhang;Y. Sun;S. Lin;B. Shen
中科院分区：
文献类型：
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作者：
M. Xu;W. Chen;L. Hu;R. Zhou;G. Zhong;T. Shi;L. Xu;Y. Zhang;Y. Sun;S. Lin;B. Shen
Beta-induced Alfvén eigenmodes (BAEs) during strong tearing modes are investigated on the EAST tokamak systematically, and the relation between the BAE frequencies and plasma parameters such as electron density , ion temperature Ti, the profile of safety factor q(ρ) or the intensity of (the width of the magnetic island w) is given in detail during the injection of the power of lower hybrid wave (LHW) (or is also accompanied by the injection of ion cyclotron resonance frequency) comprehensively. All the conditions show that the values of BAE frequencies are in agreement with the generalized fishbone-like dispersion relation, and the activities of the BAEs have a strong interaction with the process of magnetic reconnection. The BAEs are formed during the injection of the power of LHW, and disappear immediately when the power of LHW is turned off on the EAST tokamak. The LHW plasmas or the runaway discharge in Ohmic plasmas can increase the population of fast electrons, which plays a role in the activities of BAEs and a possible excitation mechanism for the BAEs during the strong tearing mode activities.
