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Modelling of plasma response to resonant magnetic perturbations and its influence on divertor strike points(IAEA24th.)
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SYSNO ASEP 0397689 Document Type O - Others R&D Document Type Others Title Modelling of plasma response to resonant magnetic perturbations and its influence on divertor strike points(IAEA24th.) Author(s) Cahyna, Pavel (UFP-V) RID
Liu, Y.Q. (GB)
Nardon, E. (FR)
Kirk, A. (GB)
Peterka, Matěj (UFP-V) RID, ORCID
Harrison, J.R. (GB)
Thornton, A. (GB)
Chapman, I. (GB)
Pánek, Radomír (UFP-V) RID
Schmitz, O. (DE)Year of issue 2013 Language eng - English Country US - United States Keywords Magnetohydrodynamics ; tokamak ; divertor ; 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 Annotation Resonant magnetic perturbations for ELM mitigation in tokamaks can be modified by the plasma response and indeed strong screening of the applied perturbation is in some cases predicted by simulations. In this contribution we use the spiralling patterns (footprints) appearing on the divertor to reveal information about the plasma response. We use two theoretical tools for investigation of the impact of plasma response on footprints: a simple model of the assumed screening currents, and the MHD code MARS-F. MARS-F predicts a more significant reduction of footprints in odd parity than in even parity, explaining the results obtained on MAST. In the MAST experiments the footprints are correlated with the density pump-out, but appear later. Their sudden appearance is incompatible with the vacuum perturbation field approximation and can be explained by a decay of the plasma screening (the event of perturbation penetration). Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2014
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