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Observation of TAE mode driven by off-axis ECRH induced barely trapped energetic electrons in EAST tokamak

N. Chu, Y. Sun, B. Shen, Y.J. Hu, S. Gu, M. Jia, H.H. Wang, T.H. Shi, J. Bao, Y.M. Duan2021年被引用 5Nuclear FusionIF 3出版社

A toroidal Alfvén eigenmode (TAE) is excited by electron cyclotron resonance heating (ECRH) induced barely trapped energetic electrons in experimental advanced superconducting tokamak . This TAE appears in the low density EAST discharges under pure off-axis ECRH heating. After analysing the ECRH power modulation induced local density and temperature oscillations, the location of this TAE mode and the power deposition of ECRH are determined. This edge localized TAE mode drifts in ion-diamagnetic direction may be driven by barely trapped energetic electrons considering the contribution of poloidal bounce effect in the general wave-particle resonance condition. The experimental observations also demonstrate that ECRH power modulation with fixed frequency could be used as an effective diagnostic tool to study the internal properties of MHD modes as well as particle and heat transports.

日本語訳

トロイダル・アルヴェン固有モード(TAE)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)によって誘起された barely trapped 高エネルギー電子により励起される。このTAEは、純粋なオフアクシスECRH加熱下での低密度EAST放電において出現する。ECRHパワー変調によって誘起される局所的な密度および温度振動を解析した後、このTAEモードの位置とECRHのパワー堆積が決定される。イオン反磁性方向にドリフトするこの周辺局在TAEモードは、一般的な波動-粒子共鳴条件におけるポロイダル・バウンス効果の寄与を考慮すると、barely trapped 高エネルギー電子によって駆動される可能性がある。実験観測はまた、固定周波数でのECRHパワー変調が、MHDモードの内部特性ならびに粒子および熱輸送を研究するための効果的な診断ツールとして使用できることを実証している。

装置

east高精度(タイトル一致)

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EASTElectron cyclotron heatingToroidal Alfvén Eigenmode
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