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Appearance and Dynamics of Helical Flux Tubes under Electron Cyclotron Resonance Heating in the Core of KSTAR Plasmas

Title
Appearance and Dynamics of Helical Flux Tubes under Electron Cyclotron Resonance Heating in the Core of KSTAR Plasmas
Authors
Yun, GSPark, HK윤건수Donne, AJHTobias, BLuhmann, NCDomier, CWJeon, YMYoon, SWLee, KDBae, YSPark, SChoe, GHChoi, MJLee, W
Date Issued
Oct-2012
Publisher
American Physical Society
Abstract
Dual (or sometimes multiple) flux tubes (DFTs) have been observed in the core of sawtoothing KSTAR tokamak plasmas with electron cyclotron resonance heating. The time evolution of the flux tubes visualized by a 2D electron cyclotron emission imaging diagnostic typically consists of four distinctive phases: (1) growth of one flux tube out of multiple small flux tubes during the initial buildup period following a sawtooth crash, resulting in a single dominant flux tube along the m/n = 1/1 helical magnetic field lines, (2) sudden rapid growth of another flux tube via a fast heat transfer from the first one, resulting in approximately identical DFTs, (3) coalescence of the two flux tubes into a single m/n = 1/1 flux tube resembling the internal kink mode in the normal sawteeth, which is explained by a model of two currentcarrying wires confined on a flux surface, and (4) fast localized crash of the merged flux tube similar to the standard sawtooth crash. The dynamics of the DFTs implies that the internal kink mode is not a unique prerequisite to the sawtooth crash, providing a new insight on the control of the sawtooth.
Keywords
SAWTOOTH CRASHES; CURRENT DRIVE; TCV; MODEL; PERIOD; TOKAMAK
URI
http://oasis.postech.ac.kr/handle/2014.oak/12490
DOI
10.1103/PHYSREVLETT.109.145003
ISSN
0031-9007
Article Type
ARTICLE
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