Beta induced Alfven eigenmode driven by energetic ions on the HL-2A tokamak
Beta induced Alfven eigenmode driven by energetic ions on the HL-2A tokamak
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HL-2A 托卡马克上高能离子驱动的 Beta 诱导阿尔文本征模
DOI：
10.1088/1741-4326/ab05ee
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发表时间：
2019
期刊：
影响因子：
3.3
通讯作者：
Yang Q W
中科院分区：
文献类型：
--
作者：
Shi P W;Chen W;Shi Z B;Duan X R;Yang Z C;Ma R R;Zhong W L;Jiang M;Yu L M;Liang A S;Wen J;Yu D L;Liu Y;Yang Q W
在HL-2A装置上进行了高能离子驱动的β诱导阿尔文本征模（BAE）研究。BAE可以在超越统一或低于统一的情况下观察到。模式频率约为60-95 kHz。用多道微波反射计和软X射线阵列探测了径向模结构。结果表明，BAE是高度本地化的归一化半径为-0.26。基于一般鱼骨状色散关系和Alfvén模式码的理论分析支持模式频率和位置的实验测量。发现BAE在低电子密度放电中更容易被激发。BAE和反向剪切Alfvén本征模的共存使得能够直接从实验中估计。
Research on beta induced Alfvén eigenmodes (BAEs) driven by energetic ions has been carried out on the HL-2A tokamak. The BAEs can be observed in the cases of being beyond or below unity. The mode frequencies are around 60–95 kHz. The radial mode structures have been detected by the multi-channel microwave reflectometer and soft x-ray arrays. The results suggest that the BAEs are highly localized at the normalized radius of–0.26. Theoretical analyses based on the general fishbone-like dispersion relation and Alfvén mode code support the experimental measurements in both mode frequencies and locations. The BAEs are found to be excited more easily in low electron density discharges. The coexistence of BAEs and reversed shear Alfvén eigenmodes enables the estimation of directly from experiments.