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

Journal Article · Fri Aug 28 00:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.103.095002· OSTI ID:21364652

Liu, A D; Lan, T; Yu, C X; Zhao, H L ^[1]; Yan, L W; Hong, W Y; Dong, J Q; Zhao, K J; Qian, J; Cheng, J; Duan, X R; Liu, Y ^[2]

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1. CAS Key Laboratory of Basic Plasma Physics, and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026 (China)
2. Southwestern Institute of Physics, P.O. Box 432, Chengdu, Sichuan 610041 (China)

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.

• OSTI ID: 21364652
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 103; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CLOSED PLASMA DEVICES
COHERENCE LENGTH
DIMENSIONS
HL-2A TOKAMAK
LENGTH
PLASMA
POTENTIALS
SPECTRA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TURBULENCE