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 language | English |
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Article number | 045004 |
Pages (from-to) | 045004-1/4 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 107 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2011 |