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- W1965503381 endingPage "055009" @default.
- W1965503381 startingPage "055009" @default.
- W1965503381 abstract "The frequency behaviour and localization of the geodesic acoustic mode (GAM), believed to be a coherent plasma turbulence-generated Er × B zonal flow (ZF) oscillation, is studied in the ASDEX Upgrade tokamak using Doppler reflectometry. In typical elongated (1.4 < κ < 1.75) plasmas with an X-point divertor configuration the GAM is observed only in the edge density gradient region 0.95 < ρpol < 1.0 between the density pedestal top and the flux surface boundary. The GAM frequency (5–25 kHz) is found to scale linearly as ω = G cs/Ro (sound speed over major radius) but with an inverse dependence on the plasma elongation κ and a weak direct dependence on the safety factor q. The lower the GAM frequency the more important it is expected to become in moderating the turbulence via shear decorrelation. A heuristic scaling law for the frequency scale factor involving κ and finite aspect ratio terms has been obtained from dedicated parameter scans. For circular plasmas κ ∼ 1 touching the limiter the density pedestal is weakened and the GAM is seen to reach in radially as far as ρpol ∼ 0.75, depending on the q profile, with a frequency scale consistent with theoretical predictions. Radially the GAM frequency is not a smooth function but displays a series of plateaus a few centimetres wide coinciding with peaks in the GAM amplitude, suggesting several ZF layers. At the plateau edges the GAM spectral peak splits into two frequency branches." @default.
- W1965503381 created "2016-06-24" @default.
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- W1965503381 date "2008-04-02" @default.
- W1965503381 modified "2023-09-29" @default.
- W1965503381 title "Frequency scaling and localization of geodesic acoustic modes in ASDEX Upgrade" @default.
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- W1965503381 doi "https://doi.org/10.1088/0741-3335/50/5/055009" @default.
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