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Destabilization of beta-induced Alfvén eigenmodes in the HL-2A tokamak

W. Chen, X.T. Ding, Yi. Liu, Q.W. Yang, X.Q. Ji, G.L. Yuan, Y.P. Zhang, M. Isobe, Y.B. Dong, Y. Huang2011年被引用 41Nuclear FusionIF 3出版社

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.

日本語訳

ベータ誘起アルヴェン固有モード(BAE)が、強いテアリングモード活動中に観測され、HL-2Aにおいて調査された(m-BAEと称される)。高エネルギー電子によって励起されたBAE(e-BAEと称される)が、オーミックプラズマとECRHプラズマの両方で同定された。カドミウムテルライドによって検出された硬X線スペクトルと、電子サイクロトロン放射によって測定された非熱放射は、高エネルギー電子の挙動を解析するために用いられる。実験結果は、e-BAEが高エネルギー電子の分布量だけでなく、そのエネルギー分布にも関連していることを示している。超音速分子ビームとガスパフによって変調されたBAEに関する興味深い結果が提示される。さらに、鋸歯状振動周期中のBAEについても本論文で述べられる。e-BAEとm-BAEの同定を評価するために、一般化されたフィッシュボーン分散関係と磁気島誘起BAE分散関係が、それぞれ臨界安定条件付近で解かれた。実験結果との比較により、計算解析で得られた周波数はすべて理論結果に近いことが示された。

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Alfvén waveAlfvén eigenmodeHL-2A
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