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β-induced Alfvén eigenmodes and fishbone driven by energetic electrons in EAST electron heating dominant plasmas

Y. Chao, L.Q. Xu, C.W. Mai, M.Q. Wu, Y.M. Duan, S.Y. Lin, K.N Geng, C. Zhou, L.Q. Hu2024年Nuclear FusionIF 3出版社

β-induced Alfvén eigenmodes (e-BAE) and fishbone (e-fishbone) driven by the energetic electrons have been identified on the experimental advanced superconducting tokamak in electron cyclotron resonance heating (ECRH), low hybrid wave (LHW) together with neutral beam injection plasma and in pure radio frequency heating plasma, respectively. The e-BAE is predominantly located near the pedestal region, and its frequency typically displays a chirping characteristic. The frequency is notably associated with the count of energetic electrons with energy between 30 keV and 80 keV driven by LHW and undergoes three distinct phases. A direct correlation is established between the frequency of e-BAE and the global parameters, including electron temperature, Alfvén velocity and . The e-fishbone emerges in the core and becomes noticeable shortly after ECRH initiation, in an electron heated dominant and core confinement enhanced discharge. Experimental analyses suggest that the e-fishbone ties closely with both the population and energy distribution of energetic electrons. These observations can provide valuable insights into the behavior of energetic electrons, which play a crucial role in the formation and sustainability of transport barriers within hybrid plasma, both in the internal and pedestal regions.

日本語訳

高エネルギー電子によって駆動されるβ誘起アルヴェン固有モード(e-BAE)およびフィッシュボーン(e-fishbone)が、実験先進超伝導トカマクにおいて、電子サイクロトロン共鳴加熱(ECRH)、低ハイブリッド波(LHW)と中性粒子ビーム入射を併用したプラズマ中、および純粋な高周波加熱プラズマ中で、それぞれ同定された。e-BAEは主にペデスタル領域近傍に位置し、その周波数は典型的にはチャープ特性を示す。その周波数は、LHWによって駆動される30 keVから80 keVのエネルギーを持つ高エネルギー電子の数と顕著に関連し、3つの異なる相を経る。e-BAEの周波数と、電子温度、アルヴェン速度および . を含む大域パラメータとの間に直接的な相関が確立されている。e-fishboneは、電子加熱支配的かつコア閉じ込めが向上した放電において、コア内に出現し、ECRH開始直後に顕著になる。実験的解析は、e-fishboneが高エネルギー電子の個数とエネルギー分布の両方に密接に関連していることを示唆している。これらの観測結果は、ハイブリッドプラズマ内の内部領域およびペデスタル領域の両方における輸送障壁の形成と持続に重要な役割を果たす高エネルギー電子の挙動について、貴重な洞察を提供し得る。

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east高精度(タイトル一致)

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EASTAlfvén waveAlfvén eigenmodeElectron heating
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