Observation of TAE mode driven by off-axis ECRH induced barely trapped energetic electrons in EAST tokamak
Observation of TAE mode driven by off-axis ECRH induced barely trapped energetic electrons in EAST tokamak
复制标题
观察 EAST 托卡马克中离轴 ECRH 诱导的几乎捕获的高能电子驱动的 TAE 模式
DOI：
10.1088/1741-4326/abe4b1
复制
发表时间：
2021
期刊：
影响因子：
3.3
通讯作者：
T.F.
中科院分区：
文献类型：
--
作者：
N. Chu;Y. Sun;B. Shen;Y.J. Hu;S. Gu;M. Jia;H.H. Wang;T.H. Shi;J. Bao;Y.M. Duan;K.Y. He;E. Li;H.Q. Liu;Y. Liu;B. Lyu;Q. Ma;J.P. Qian;J. Ren;A. Ti;H.L. Wang;S.X. Wang;X.J. Wang;Y.M. Wang;Q. Zang;L. Zeng;J.Z. Zhang;T. Zhang;Y. Zhang;H.L. Zhao;R.J. Zhou;T.F.
抽象。在实验先进超导托卡马克装置中，电子回旋共振加热（ECRH）产生的束缚态高能电子激发了环形Alfvén本征模（TAE）。这种TAE出现在纯离轴ECRH加热下的低密度EAST放电中。通过分析ECRH功率调制引起的局域密度和温度振荡，确定了TAE模的位置和ECRH的功率沉积。考虑到在一般波粒共振条件下极向反弹效应的贡献，这种边缘局域TAE模在离子-抗磁方向上的漂移可能是由勉强捕获的高能电子驱动的。实验结果还表明，固定频率的ECRH功率调制可以作为一种有效的诊断工具，用于研究MHD模式的内部特性以及粒子和热输运。
Abstract. 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.