Two-dimensional visualization of growth and burst of the edge-localized filaments in KSTAR H-mode plasmas

G.S. Yun, Woochang Lee, M.J. Choi, J. Lee, H.K. Park, B.J. Tobias, C.W. Domier, N.C. Luhmann, A.J.H. Donné, J.H. Lee

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Abstract

The filamentary nature and dynamics of edge-localized modes (ELMs) in the KSTAR high-confinement mode plasmas have been visualized in 2D via electron cyclotron emission imaging. The ELM filaments rotating with a net poloidal velocity are observed to evolve in three distinctive stages: initial linear growth, interim quasisteady state, and final crash. The crash is initiated by a narrow fingerlike perturbation growing radially from a poloidally elongated filament. The filament bursts through this finger, leading to fast and collective heat convection from the edge region into the scrape-off layer, i.e., ELM crash.
Original languageEnglish
Article number045004
Pages (from-to)045004-1/4
Number of pages4
JournalPhysical Review Letters
Volume107
Issue number4
DOIs
Publication statusPublished - 2011

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