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- W2135846783 abstract "Introduction Different from the zonal flows in the tokamak core, which are the only mechanism for turbulence saturation there, geodesic acoustic modes (GAM) in the edge are only one possibility for turbulence control in their regime, considering the higher efficiency of nonlinear turbulence interactions in the edge. In fact, experimental observations of GAMs so far seem to be limited to rather weak activity with displacement amplitudes of . 1cm [1, 2], which are unlikely to seriously influence the turbulence amplitudes as, e.g., in the turbulence simulations for the transitional regime in [3]. One difference is of course the simplistic circular geometry used in those simulations, whence in the first part below it is explored in how far flux surface ellipticity modifies GAM activity and its impact on the turbulence. Studying the effect of the experimentally uncertain background gradients on the GAM activity, it was found that in particular very high gradients can cause rather strong GAMs with a substantial impact on the transport. The numerical turbulence studies were performed with the NLET code [4] using two-fluid electrostatic Braginskii equations with modified parallel heat conduction coefficient implementing a collisionless heat flux limit. The magnetic geometry was represented by local Millerequilibria [5]." @default.
- W2135846783 created "2016-06-24" @default.
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- W2135846783 date "2009-01-01" @default.
- W2135846783 modified "2023-09-27" @default.
- W2135846783 title "Dependence of turbulent transport on GAMs" @default.
- W2135846783 hasPublicationYear "2009" @default.
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