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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
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: |
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| 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) |
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