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Characteristics of X-point lobe structures in single-null discharges on MAST
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SYSNO ASEP 0434796 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Characteristics of X-point lobe structures in single-null discharges on MAST Author(s) Harrison, J.R. (GB)
Kirk, A. (GB)
Chapman, I.T. (GB)
Cahyna, Pavel (UFP-V) RID
Liu, Y. (GB)
Nardon, E. (FR)
Thornton, A.J. (GB)Source Title Nuclear Fusion. - : Institute of Physics Publishing - ISSN 0029-5515
Roč. 54, č. 6 (2014), 064015-064015Number of pages 9 s. Publication form Print - P Language eng - English Country AT - Austria Keywords tokamak ; MAST ; X-point ; resonant magnetic perturbation Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GAP205/11/2341 GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 UT WOS 000336893100016 EID SCOPUS 84901401977 DOI 10.1088/0029-5515/54/6/064015 Annotation Lobe structures due to the application of resonant magnetic perturbations (RMPs) have been observed using wide-angle imaging of light from He1+ ions in the vicinity of the lower X-point in MAST. Above a threshold value the lobe structures extend radially, linearly with the coil current, both in L-mode and H-mode. After the application of the RMP, as the toroidal rotation in the confined plasma decreases, the lobes extend radially. This suggests the plasma is less effectively screening the RMP field. Comparing the imaging data with results from vacuum modelling shows that this technique can accurately predict the number and poloidal location of the lobes, but over-estimates their radial extent. More accurate estimates of the extent of the lobes can be made by accounting for plasma screening of the RMP field. Qualitative agreement between simulation and experiment is found if it is assumed that the RMP penetrates 2% in normalized radius from the last closed flux surface. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2015
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