Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session JO05: Edge and Pedestal Physics
2:00 PM–5:00 PM,
Tuesday, October 18, 2022
Room: Ballroom 111 B
Chair: Roberto Maurizio, Oak Ridge Associated Universities / General Atomics
Abstract: JO05.00005 : Filament structures, intermittent fluctuations and broad average profiles at the boundary of magnetically confined plasma
2:48 PM–3:00 PM
Presenter:
Juan M Losada
(UiT The Arctic University of Norway)
Author:
Juan M Losada
(UiT The Arctic University of Norway)
More generally, we investigate the implications of correlations between filament parameters on the mean profiles and higher-order statistical moments. A broad distribution of pulse velocities leads to non-exponential profiles and strongly increased intermittency in the far-SOL. It is demonstrated that this explains many features from experimental measurements. Three mechanisms are identified for increased intermittency with radial distance into the SOL: (i) a change in amplitude distribution due to parallel drainage, (ii) correlation between pulse amplitudes and duration times, and (iii) stagnation of pulses when the velocity depends on the instantaneous amplitude.
Model predictions will be presented for theoretically predicted relations between pulse amplitudes, sizes and velocities in inertial and sheath dissipative regimes. This demonstrates the formation of a shoulder structure in the average density profile with broad far-SOL profiles, high relative fluctuation levels throughout the SOL, and strong intermittency with positively skewed and flattened probability density functions in the far-SOL. The results will be discussed in the context of first-principles-based turbulence simulations of the SOL as well as experimental measurements of the Alcator C-Mod device. The relevance for plasma-wall interactions like sputtering will be pointed out.
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