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Lee, Woochang
UNIST Fusion Plasma Laboratory
Research Interests
  • Development of advanced microwave imaging diagnostics for fusion plasma
  • Turbulence and transport in fusion plasma
  • MHD instabilities in fusion plasma

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Dynamics of multiple flux tubes in sawtoothing KSTAR plasmas heated by electron cyclotron waves: I. Experimental analysis of the tube structure

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Title
Dynamics of multiple flux tubes in sawtoothing KSTAR plasmas heated by electron cyclotron waves: I. Experimental analysis of the tube structure
Author
Choe, GyuenghyuenYun, GunsuNam, YoonbumLee, WoochangPark, Hyeon KeoBierwage, AndreasDomier, Calvin W.Luhmann, N. C., JrJeong, J.H.Bae, Youngsoon
Issue Date
2015-01
Publisher
INT ATOMIC ENERGY AGENCY
Citation
NUCLEAR FUSION, v.55, no.1, pp.1 - 7
Abstract
Multiple (two or more) flux tubes are commonly observed inside and/or near the q = 1 flux surface in KSTAR tokamak plasmas with localized electron cyclotron resonance heating and current drive (ECH/CD). Detailed 2D and quasi-3D images of the flux tubes obtained by an advanced imaging diagnostic system showed that the flux tubes are m/n = 1/1 field-aligned structures co-rotating around the magnetic axis. The flux tubes typically merge together and become like the internal kink mode of the usual sawtooth, which then collapses like a usual sawtooth crash. A systematic scan of ECH/CD beam position showed a strong correlation with the number of flux tubes. In the presence of multiple flux tubes close to the q = 1 surface, the radially outward heat transport was enhanced, which explains naturally temporal changes of electron temperature. We emphasize that the multiple flux tubes are a universal feature distinct from the internal kink instability and play a critical role in the control of sawteeth using ECH/CD.
URI
https://scholarworks.unist.ac.kr/handle/201301/10323
URL
https://iopscience.iop.org/article/10.1088/0029-5515/55/1/013015
DOI
10.1088/0029-5515/55/1/013015
ISSN
0029-5515
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PHY_Journal Papers
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