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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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Toroidal mode number transition of the edge localized modes in the KSTAR plasmas

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Title
Toroidal mode number transition of the edge localized modes in the KSTAR plasmas
Author
Lee, J.E.Yun, GunsuKim, M.Lee, JisanLee, WoochangPark, Hyeon KeoDomier, Calvin W.Luhmann, Neville C.Ko, W.H.
Issue Date
2015-11
Publisher
INT ATOMIC ENERGY AGENCY
Citation
NUCLEAR FUSION, v.55, no.11, pp.113035
Abstract
Rapid transitions of the toroidal mode number (n) have been often detected during the evolution of the edge localized modes (ELMs) in the inter-ELM-crash periods of the KSTAR tokamak plasmas. The mode number transitions accompany changes of the mode frequency (f(mode)) (e.g. n changed from 8 to 5 while f(mode) changed from similar to 32 to 9 kHz). The observed transition phenomena have been diverse including small and large increase (or decrease) in the mode number and multiple transitions during a single inter-ELM-crash period. Two classes of the mode transitions were identified: non-overlapping transition and overlapping transition. The former case is characterized by the absence of coherent filamentary structure during the transition and the latter case is characterized by co-existence of two coherent filamentary structures with different mode numbers. Each transition process typically lasts a few hundreds to thousands of mu s.
URI
https://scholarworks.unist.ac.kr/handle/201301/17870
URL
http://iopscience.iop.org/article/10.1088/0029-5515/55/11/113035/meta
DOI
10.1088/0029-5515/55/11/113035
ISSN
0029-5515
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