Turbulence and zonal flows in edge plasmas of the HL-2A tokamak

被引：33

作者：

Zhao, K. J. ^{[1
]}

Dong, J. Q. ^{[1
,2
]}

Yan, L. W. ^{[1
]}

Hong, W. Y. ^{[1
]}

Fujisawa, A. ^{[3
]}

Yu, C. X. ^{[4
]}

Li, Q. ^{[1
]}

Qian, J. ^{[1
]}

Cheng, J. ^{[1
]}

Lan, T. ^{[4
]}

Liu, A. D. ^{[4
]}

Zhao, H. L. ^{[4
]}

Kong, D. F. ^{[4
]}

Huang, Y. ^{[1
]}

Liu, Yi ^{[1
]}

Song, X. M. ^{[1
]}

Yang, Q. W. ^{[1
]}

Ding, X. T. ^{[1
]}

Duan, X. R. ^{[1
]}

Liu, Yong ^{[1
]}

机构：

[1] SW Inst Phys, Chengdu, Peoples R China

[2] Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310003, Zhejiang, Peoples R China

[3] Kyushu Univ, Appl Mech Res Inst, Kasuga, Fukuoka 8168580, Japan

[4] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2010年 / 52卷 / 12期

关键词：

GEODESIC-ACOUSTIC-MODE; TRANSPORT; OSCILLATIONS; COHERENT; PHYSICS; SEARCH; WAVES;

D O I：

10.1088/0741-3335/52/12/124008

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Measurements with a toroidally and poloidally displaced three-dimensional set of Langmuir probe arrays have revealed details of turbulence, geodesic acoustic modes (GAMs), zonal flows and their interactions in the edge region of HL-2A tokamak plasmas. The coexistence of intensive low frequency zonal flows (LFZFs) off < 4 kHz and the GAMs of 7 kHz < f(GAM) < 20 kHz has been unambiguously demonstrated. The poloidal and toroidal symmetries of the flows, including the GAMs, are verified experimentally. In particular, the coherency of the flows over a large toroidal scale of 2100 mm at a magnetic flux surface is emphasized. The LFZF packets are shown to propagate outward and inward as equally likely events, whereas the predominantly outward propagation of the GAM packets is analyzed. The nonlinear three-wave coupling of the flows with ambient turbulence is shown with a bicoherency analysis and an envelope modulation of the latter by the former. The intensity of the LFZFs is observed to increase and decrease with increases in ECRH power (similar to 300-700 kW) and safety factor q similar to (3.5-6.2), respectively, whereas the intensity of the GAMs increases with increases in both ECRH power and q.

引用

页数：11

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