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

K. J. Zhao; J. Q. Dong; L. W. Yan; W. Y. Hong; A. Fujisawa; C. X. Yu; Q. Li; J. Qian; J. Cheng; T. Lan; A. D. Liu; H. L. Zhao; D. F. Kong; Y. Huang; Y. Liu; X. M. Song; Q. W. Yang; X. T. Ding; X. R. Duan; Y. Liu

doi:10.1088/0741-3335/52/12/124008

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

K. J. Zhao, J. Q. Dong, L. W. Yan, W. Y. Hong, A. Fujisawa, C. X. Yu, Q. Li, J. Qian, J. Cheng, T. Lan, A. D. Liu, H. L. Zhao, D. F. Kong, Y. Huang, Y. Liu, X. M. Song, Q. W. Yang, X. T. Ding, X. R. Duan, Y. Liu

Division of Nuclear Fusion Dynamics

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34 Citations (Scopus)

Abstract

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 2100mm 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 (̃300-700 kW) and safety factor q ̃ (3.5-6.2), respectively, whereas the intensity of the GAMs increases with increases in both ECRH power and q.

Original language	English
Article number	124008
Journal	Plasma Physics and Controlled Fusion
Volume	52
Issue number	12
DOIs	https://doi.org/10.1088/0741-3335/52/12/124008
Publication status	Published - Dec 2010

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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10.1088/0741-3335/52/12/124008

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Zhao, K. J., Dong, J. Q., Yan, L. W., Hong, W. Y., Fujisawa, A., Yu, C. X., Li, Q., Qian, J., Cheng, J., Lan, T., Liu, A. D., Zhao, H. L., Kong, D. F., Huang, Y., Liu, Y., Song, X. M., Yang, Q. W., Ding, X. T., Duan, X. R., & Liu, Y. (2010). Turbulence and zonal flows in edge plasmas of the HL-2A tokamak. Plasma Physics and Controlled Fusion, 52(12), [124008]. https://doi.org/10.1088/0741-3335/52/12/124008

Zhao, KJ, Dong, JQ, Yan, LW, Hong, WY, Fujisawa, A, Yu, CX, Li, Q, Qian, J, Cheng, J, Lan, T, Liu, AD, Zhao, HL, Kong, DF, Huang, Y, Liu, Y, Song, XM, Yang, QW, Ding, XT, Duan, XR & Liu, Y 2010, 'Turbulence and zonal flows in edge plasmas of the HL-2A tokamak', Plasma Physics and Controlled Fusion, vol. 52, no. 12, 124008. https://doi.org/10.1088/0741-3335/52/12/124008

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title = "Turbulence and zonal flows in edge plasmas of the HL-2A tokamak",

abstract = "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 < fGAM < 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 2100mm 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 {\~(}300-700 kW) and safety factor q{\~ } (3.5-6.2), respectively, whereas the intensity of the GAMs increases with increases in both ECRH power and q.",

author = "Zhao, {K. J.} and Dong, {J. Q.} and Yan, {L. W.} and Hong, {W. Y.} and A. Fujisawa and Yu, {C. X.} and Q. Li and J. Qian and J. Cheng and T. Lan and Liu, {A. D.} and Zhao, {H. L.} and Kong, {D. F.} and Y. Huang and Y. Liu and Song, {X. M.} and Yang, {Q. W.} and Ding, {X. T.} and Duan, {X. R.} and Y. Liu",

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doi = "10.1088/0741-3335/52/12/124008",

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T1 - Turbulence and zonal flows in edge plasmas of the HL-2A tokamak

AU - Zhao, K. J.

AU - Dong, J. Q.

AU - Yan, L. W.

AU - Hong, W. Y.

AU - Fujisawa, A.

AU - Yu, C. X.

AU - Li, Q.

AU - Qian, J.

AU - Cheng, J.

AU - Lan, T.

AU - Liu, A. D.

AU - Zhao, H. L.

AU - Kong, D. F.

AU - Huang, Y.

AU - Liu, Y.

AU - Song, X. M.

AU - Yang, Q. W.

AU - Ding, X. T.

AU - Duan, X. R.

AU - Liu, Y.

PY - 2010/12

Y1 - 2010/12

N2 - 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 < fGAM < 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 2100mm 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 (̃300-700 kW) and safety factor q ̃ (3.5-6.2), respectively, whereas the intensity of the GAMs increases with increases in both ECRH power and q.

AB - 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 < fGAM < 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 2100mm 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 (̃300-700 kW) and safety factor q ̃ (3.5-6.2), respectively, whereas the intensity of the GAMs increases with increases in both ECRH power and q.

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

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