Two-dimensional imaging of edge-localized modes in KSTAR plasmas unperturbed and perturbed by n=1 external magnetic fields

TitleTwo-dimensional imaging of edge-localized modes in KSTAR plasmas unperturbed and perturbed by n=1 external magnetic fields
Publication TypeJournal Article
Year of Publication2012
AuthorsG.S Yun, W. Lee, M.J Choi, J. Lee, H.K Park, C.W. Domier, NC Luhmann, Jr., B. Tobias, A.JH Donne, J.H Lee, Y.M Jeon, S.W Yoon
JournalPhysics of Plasmas
Volume19
Number5
Pagination6
Date PublishedMay
Type of ArticleArticle
ISBN Number1070-664X
KeywordsDYNAMICS, PEDESTAL, TOKAMAK, TRANSPORT
Abstract

The temporal evolution of edge-localized modes (ELMs) has been studied using a 2-D electron cyclotron emission imaging system in the KSTAR tokamak. The ELMs are observed to evolve in three distinctive stages: the initial linear growth of multiple filamentary structures having a net poloidal rotation, the interim state of regularly spaced saturated filaments, and the final crash through a short transient phase characterized by abrupt changes in the relative amplitudes and distance among filaments. The crash phase, typically consisted of multiple bursts of a single filament, involves a complex dynamics, poloidal elongation of the bursting filament, development of a fingerlike bulge, and fast localized burst through the finger. Substantial alterations of the ELM dynamics, such as mode number, poloidal rotation, and crash time scale, have been observed under external magnetic perturbations with the toroidal mode number n = 1. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3694842]

DOI10.1063/1.3694842
Division

FP

Department

FP

PID

60725d4dc75df39f8073157918e55790

Alternate TitlePhys. Plasmas
LabelOA

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