Multiscale interaction between a large scale magnetic island and small scale turbulence
SCIE
SCOPUS
- Title
- Multiscale interaction between a large scale magnetic island and small scale turbulence
- Authors
- Choi, M. J.; Kim, J.; Kwon, J. -M.; Park, H. K.; In, Y.; Lee, W.; Lee, K. D.; Yun, G. S.; Lee, J.; Kim, M.; Ko, W. -H.; Lee, J. H.; Park, Y. S.; Na, Y. -S.; Luhmann, N. C., Jr.; Park, B. H.
- Date Issued
- 2017-12
- Publisher
- IOP PUBLISHING LTD
- Abstract
- Multiscale interaction between the magnetic island and turbulence has been demonstrated through simultaneous two-dimensional measurements of turbulence and temperature and flow profiles. The magnetic island and turbulence can mutually interact via coupling between the electron temperature (T-e) gradient, the T-e turbulence, and the poloidal flow. The T-e gradient altered by the magnetic island steepens outside and flattens inside the island. The T-e turbulence can appear in increased T-e gradient regions. The combined effects of the Te gradient and the poloidal flow shear determines the two-dimensional distribution of the T-e turbulence. When the poloidal vortex flow forms, it can maintain the steepest T-e gradient and the magnetic island acts more like an electron heat transport barrier. Interestingly, when the T-e gradient, the T-e turbulence, and the vortex flow shear increase beyond critical levels, the magnetic island turns into a fast electron heat transport channel, which directly leads to the minor disruption.
- Keywords
- TOKAMAK PLASMAS; PERTURBATIONS; TRANSPORT; FLOWS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/50760
- DOI
- 10.1088/1741-4326/aa86fe
- ISSN
- 0029-5515
- Article Type
- Article
- Citation
- NUCLEAR FUSION, vol. 57, no. 12, 2017-12
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- There are no files associated with this item.
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