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Experimental observations of modes with geodesic acoustic character from the core to the edge in the TCV tokamak

Abstract : The geodesic acoustic mode is a coherently oscillating mode, related to the zonal flows that can regulate turbulence in magnetized toroidal plasmas. Modes possessing geodesic acoustic character have been widely observed in the TCV tokamak. A transition has been observed in the course of a single discharge from a continuum regime to a radially extended single-frequency regime. The mode has been also observed and characterized for the first time in the scrape-off layer, primarily by Langmuir probes, suggesting a particle flow to the edge modulated at the mode frequency. These experimental observations are consistent with nonlinear global gyrokinetic simulations, reported in a companion paper (Merlo et al 2017 Plasma Phys. Control. Fusion). These also suggest a possible coupling with radial avalanche phenomena.
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https://hal-amu.archives-ouvertes.fr/hal-01874769
Contributor : Valérie Gall <>
Submitted on : Friday, September 14, 2018 - 4:34:38 PM
Last modification on : Friday, October 19, 2018 - 1:17:02 AM

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Zhouji Huang, Stefano Coda, Gabriele Merlo, Stephan Brunner, Laurent Villard, et al.. Experimental observations of modes with geodesic acoustic character from the core to the edge in the TCV tokamak. Plasma Physics and Controlled Fusion, IOP Publishing, 2018, 60 (3), ⟨10.1088/1361-6587/aaa71d⟩. ⟨hal-01874769⟩

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