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Edge localized mode rotation and the nonlinear dynamics of filaments
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SYSNO ASEP 0460362 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Edge localized mode rotation and the nonlinear dynamics of filaments Author(s) Morales, J.A. (FR)
Bécoulet, M. (FR)
Garbet, X. (FR)
Orain, F. (FR)
Dif-Pradalier, G. (FR)
Hoelzl, M. (DE)
Pamela, S. (GB)
Huijsmans, G.T.A. (FR)
Cahyna, Pavel (UFP-V) RID
Fil, A. (FR)
Nardon, E. (FR)
Passeron, C. (FR)
Latu, G. (FR)Article number 042513 Source Title Physics of Plasmas - ISSN 1070-664X
Roč. 23, č. 4 (2016)Number of pages 8 s. Publication form Print - P Language eng - English Country US - United States Keywords Edge Localized Modes (ELMs) ; MHD ; tokamak ; ITER Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Institutional support UFP-V - RVO:61389021 UT WOS 000375855500041 EID SCOPUS 84966263908 DOI 10.1063/1.4947201 Annotation Edge Localized Modes (ELMs) rotating precursors were reported few milliseconds before an ELM crash in several tokamak experiments. Also, the reversal of the filaments rotation at the ELM crash is commonly observed. In this article, we present a mathematical model that reproduces the rotation of the ELM precursors as well as the reversal of the filaments rotation at the ELM crash. Linear ballooning theory is used to establish a formula estimating the rotation velocity of ELM precursors. The linear study together with nonlinear magnetohydrodynamic simulations give an explanation to the rotations observed experimentally. Unstable ballooning modes, localized at the pedestal, grow and rotate in the electron diamagnetic direction in the laboratory reference frame. Approaching the ELM crash, this rotation decreases corresponding to the moment when the magnetic reconnection occurs. During the highly nonlinear ELM crash, the ELM filaments are cut from the main plasma due to the strong sheared mean flow that is nonlinearly generated via the Maxwell stress tensor. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2017
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