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Observation of geodesic acoustic mode in EAST using Doppler backscattering system

This paper presents an investigation of the geodesic acoustic mode (GAM) using two poloidally separated Doppler backscattering systems in Experimental Advanced Superconducting Tokamak. Each system allows for the simultaneous measurement of turbulence rotation velocity and density fluctuations with h...

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Published in:	Physics of plasmas 2018-09, Vol.25 (9)
Main Authors:	Zhang, X. H., Liu, A. D., Zhou, C., Hu, J. Q., Wang, M. Y., Feng, X., Li, C. H., Yang, X. M., Sang, L., Ai, J. Q.
Format:	Article
Language:	English
Subjects:	Backscattering Bispectral analysis Fluid dynamics Plasma density Plasma physics Tokamak devices Turbulence Variation
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container_title	Physics of plasmas
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creator	Zhang, X. H. Liu, A. D. Zhou, C. Hu, J. Q. Wang, M. Y. Feng, X. Li, C. H. Yang, X. M. Sang, L. Ai, J. Q.
description	This paper presents an investigation of the geodesic acoustic mode (GAM) using two poloidally separated Doppler backscattering systems in Experimental Advanced Superconducting Tokamak. Each system allows for the simultaneous measurement of turbulence rotation velocity and density fluctuations with high precision. With the Doppler backscattering systems, the GAM frequency, the symmetric feature of poloidal flow fluctuations, and the interaction between GAM and turbulence are surveyed. The results of bispectral analysis show a clear interaction of GAM with the ambient turbulence. A clear measurement of GAM in the envelope of plasma density fluctuations using Doppler backscatter system is shown, and the modulations of the turbulence perpendicular velocity on the density turbulence are correlated at two different poloidal position.
doi_str_mv	10.1063/1.5033432
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source	American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list); American Institute of Physics(アメリカ物理学協会)
subjects	Backscattering Bispectral analysis Fluid dynamics Plasma density Plasma physics Tokamak devices Turbulence Variation
title	Observation of geodesic acoustic mode in EAST using Doppler backscattering system
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