Experimental observation of the localized coupling between geodesic acoustic mode and magnetic islands in tokamak plasmas-猫眼课题宝

DOI：

10.1088/1741-4326/abd72d

发表时间：

2021-03

期刊：

Nuclear Fusion

影响因子：

3.3

通讯作者：

中科院分区：

物理与天体物理1区

文献类型：

作者：

Ming Xu;D. Kong;A. Liu;Y.F. Liang;H. Cai;Z. Qiu;W. Chen;T. Shi;Y. Duan;H. Xiang;Y.M. Wang;T. Zhang;S.B. Zhang;X. Gao;X. Feng;C. Zhou;G. Zhuang;L. Hu;G.S. Xu;X. Gong;X.D. Zhang;B. Wan;the EAST team

在实验型先进超导托卡马克中研究了测地声模（GAM）、撕裂模（TMs）和双反传播β诱导的alfv<s:1>本征模（BAEs）波之间的局域耦合。在TMs出现之前，通过多通道多普勒后向散射（DBS）诊断观察到典型的连续GAM。经DBS阵列测量证实，磁岛在q = 4有理面上被激发，在R≈2.23 m（归一化半径ρ≈0.8）处同步观测到GAM和双BAEs。提出了一种合理的激发机制，即利用GAM与磁岛之间的非线性相互作用来激发双BAEs。随着磁岛宽度的增加，电磁双BAEs随静电GAM的减小而同步增加，强烈表明电磁成分是静电GAM与磁岛之间三波相互作用的抽运。

The localized coupling among geodesic acoustic mode (GAM), tearing modes (TMs) and twin counter-propagating beta-induced Alfvén eigenmodes (BAEs) waves has been investigated in the experimental advanced superconducting tokamak. Before the appearance of TMs, typical continuous GAM is observed through the multi-channel Doppler backscattering (DBS) diagnostic. The twin BAEs can be excited after the burst of magnetic islands, which are localized to the q = 4 rational surface that is confirmed by the measurement of DBS array, where the GAM and twin BAEs are observed synchronically at R ≈ 2.23 m (normalized radius ρ ≈ 0.8). One reasonable excitation mechanism is proposed that the twin BAEs can be excited by the nonlinear interaction between GAM and magnetic islands. As the width of magnetic islands increases, the electromagnetic twin BAEs increase synchronically with the decreasing of electrostatic GAM, strongly suggesting that the electromagnetic components are pumped from three-wave interaction between electrostatic GAM and magnetic islands.

Experimental observation of the localized coupling between geodesic acoustic mode and magnetic islands in tokamak plasmas

文献摘要

相似文献