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Experimental observation of beta-induced Alfvén eigenmodes during strong tearing modes on the EAST tokamak in fast-electron plasmas

M Xu, W Chen, L Q Hu, R J Zhou, G Q Zhong, T H Shi, L Q Xu, Y Zhang, Y W Sun, S Y Lin2013年Plasma Physics and Controlled FusionIF 2.2出版社

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.

日本語訳

EASTトカマクにおいて、強いテアリングモード中のベータ誘起アルヴェン固有モード(BAE)を系統的に調査し、BAE周波数と電子密度、イオン温度、安全係数q(ρ)の分布、あるいは(磁気島の幅w)などのプラズマパラメータとの関係を、低混成波(LHW)のパワー入射中(またはイオンサイクロトロン共鳴周波数の入射を伴う場合も含む)に詳細に示した。すべての条件下において、BAE周波数の値は一般化されたフィッシュボーン型分散関係と一致し、BAEの活動は磁気リコネクションの過程と強く関連していることが示された。BAEはLHWのパワー入射中に形成され、EASTトカマクにおいてLHWのパワーを遮断すると直ちに消滅する。LHWプラズマ、あるいはオーミックプラズマ中のランダウェイ放電は、高速電子の集団を増加させることができ、これは強いテアリングモード活動中のBAEの活動と、BAEの可能な励起メカニズムにおいて役割を果たしている。

装置

east高精度(タイトル一致)

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Fusion Advanced Studies TorusEASTAlfvén waveTearing modeAlfvén eigenmodeElectron plasma
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