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Edge turbulence and flows in the presence of resonant magnetic perturbations on MAST

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MAST Team (Including: Tamain, P., Kirk, A., Nardon, E., Dudson, B. and Hnat , B.). (2010) Edge turbulence and flows in the presence of resonant magnetic perturbations on MAST. Plasma Physics and Controlled Fusion, Vol.52 (No.7). Article: 075017. doi:10.1088/0741-3335/52/7/075017

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Official URL: http://dx.doi.org/10.1088/0741-3335/52/7/075017

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Abstract

The impact of resonant magnetic perturbations (RMPs) on the edge of MAST L-mode plasmas is studied using a mid-plane reciprocating probe equipped with a Gundestrup probe head. A strong impact on the characteristics of the ion saturation current fluctuations is observed just inside the separatrix, with a broadening of the power spectrum and an asymmetrization of the probability distribution functions towards non-Gaussian shapes. No major effect is found in the scrape-off layer (SOL). Floating potential measurements are used to evaluate the modification of the plasma potential profiles. The radial electric field profile flattens when RMPs are applied, leading to a theoretically expected increase in Er inside the separatrix and a decrease in the SOL. A consistent change is observed on the perpendicular and parallel flows which tend to increase inside the separatrix. In contrast, in the SOL, a braking of the rotation is observed with the application of RMPs. All these effects occur only above a threshold in the amplitude of the current applied in the RMP coils and are not toroidally localized.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: Plasma Physics and Controlled Fusion
Publisher: Institute of Physics Publishing Ltd.
ISSN: 0741-3335
Official Date: July 2010
Dates:
DateEvent
July 2010Published
Volume: Vol.52
Number: No.7
Number of Pages: 18
Page Range: Article: 075017
DOI: 10.1088/0741-3335/52/7/075017
Status: Peer Reviewed
Publication Status: Published
Funder: Engineering and Physical Sciences Research Council (EPSRC), European Communities
Grant number: EP/G003955 (EPSRC)

Data sourced from Thomson Reuters' Web of Knowledge

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