Destabilization of beta-induced Alfvén eigenmodes in the HL-2A tokamak
Destabilization of beta-induced Alfvén eigenmodes in the HL-2A tokamak
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DOI：
10.1088/0029-5515/51/6/063010
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发表时间：
2011-06
期刊：
影响因子：
3.3
通讯作者：
W. Chen;X. Ding;Yi Liu;Q.W. Yang;X. Ji;G. Yuan;Y.P. Zhang;M. Isobe;Y.B. Dong;Y. Huang-Y.-Huan
中科院分区：
文献类型：
--
作者：
W. Chen;X. Ding;Yi Liu;Q.W. Yang;X. Ji;G. Yuan;Y.P. Zhang;M. Isobe;Y.B. Dong;Y. Huang-Y.-Huan
在HL-2A中观测和研究了强撕裂模活动（称为m-BAE）过程中β诱导的Alfvén本征模（BAE）。在欧姆等离子体和ECRH等离子体中都发现了由高能电子激发的BAE（称为e-BAE）。利用碲化镉探测的硬X射线谱和电子回旋辐射测量的非热辐射，分析了高能电子的行为。实验结果表明，e-BAE不仅与高能电子的布居数有关，而且与它们的能量分布有关。本文给出了超声分子束和吹气调制BAE的一个有趣结果。此外，BAE在一个循环的过程中，本文进行了描述。为了评估e-BAE和m-BAE的识别，分别在边缘稳定附近求解了广义鱼骨状色散关系和磁岛诱导的BAE色散关系。通过与实验结果的对比，计算分析表明，实测频率与理论计算结果均较为接近。
Beta-induced Alfvén eigenmode (BAE) during a strong tearing mode activity (termed as m-BAE) has been observed and investigated in HL-2A. BAE excited by energetic electrons (termed as e-BAE) has been identified both in the Ohmic and ECRH plasma. The hard x-ray spectrum detected by cadmium telluride and the non-thermal radiation measured by electron cyclotron emission are used to analyse the behaviour of the energetic electrons. Experimental results show that the e-BAE is related not only to the populations of the energetic electrons, but also their energy distribution. An interesting result about the BAEs modulated by a supersonic molecular beam and gas puffing is presented. In addition, BAEs during a sawtooth cycle are described in this paper. To assess the identification of the e-BAE and m-BAE, the generalized fishbone-like dispersion relation and magnetic-island-induced BAE dispersion relation are solved near marginal stability, respectively. Compared with experimental results, the calculation analysis shows that the observed frequencies are all close to the theoretical results.