Characterizations of Low-Frequency Zonal Flow in the Edge Plasma of the HL-2A Tokamak

被引：79
作者：
Liu, A. D. [1 ,2 ]
Lan, T. [1 ,2 ]
Yu, C. X. [1 ,2 ]
Zhao, H. L. [1 ,2 ]
Yan, L. W. [3 ]
Hong, W. Y. [3 ]
Dong, J. Q. [3 ]
Zhao, K. J. [3 ]
Qian, J. [3 ]
Cheng, J. [3 ]
Duan, X. R. [3 ]
Liu, Y. [3 ]
机构：
[1] Univ Sci & Technol China, CAS Key Lab Basic Plasma Phys, Hefei 230026, Anhui, Peoples R China
[2] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China
[3] SW Inst Phys, Chengdu 610041, Sichuan, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 09期
关键词：
ACOUSTIC MODE OSCILLATIONS; DIII-D TOKAMAK; TURBULENT TRANSPORT; TOROIDAL PLASMAS; DRIFT WAVES; MECHANISM; SPECTRA;
D O I：
10.1103/PhysRevLett.103.095002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A low-frequency (< 4 kHz), poloidally and toroidally symmetrical potential structure that peaks near zero frequency is observed in the edge plasma of the HL-2A tokamak. The axisymmetry structure exhibits a radial coherence length less than 1 cm. These characteristics are consistent with the theoretically predicted low-frequency zonal flows (LFZF). The radial wave-number frequency spectra of the LFZF show that the LFZF packets propagate both outwards and inwards. The geodesic acoustic mode (GAM) is found to coexist with the LFZF, and the LFZF is found to modulate the GAM and ambient turbulence with in-phase and antiphase relations, respectively, through an envelope analysis.
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