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
- Authors
- Lee, JE; Yun, GS; Kim, M; Lee, J; Lee, W; Park, HK; Domier, CW; Luhmann, NC; Ko, WH
- Date Issued
- 2015-11
- Publisher
- IOP Publishing
- 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://oasis.postech.ac.kr/handle/2014.oak/35582
- DOI
- 10.1088/0029-5515/55/11/113035
- ISSN
- 0029-5515
- Article Type
- Article
- Citation
- NUCLEAR FUSION, vol. 55, no. 11, page. 113035, 2015-11
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