title: Two-dimensional visualization of growth and burst of the edge-localized filaments in KSTAR H-mode plasmas.
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.
authors.affiliation: POSTECH, Pohang, Republic of Korea.
authors.forename: G S
authors.initials: GS
authors.lastname: Yun
authors.forename: W
authors.initials: W
authors.lastname: Lee
authors.forename: M J
authors.initials: MJ
authors.lastname: Choi
authors.forename: J
authors.initials: J
authors.lastname: Lee
authors.forename: H K
authors.initials: HK
authors.lastname: Park
authors.forename: B
authors.initials: B
authors.lastname: Tobias
authors.forename: C W
authors.initials: CW
authors.lastname: Domier
authors.forename: N C
authors.initials: NC
authors.lastname: Luhmann
authors.forename: A J H
authors.initials: AJ
authors.lastname: Donné
authors.forename: J H
authors.initials: JH
authors.lastname: Lee