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Multiscale interaction between a large scale magnetic island and small scale turbulence

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Title
Multiscale interaction between a large scale magnetic island and small scale turbulence
Author
Choi, M.J.Kim, JKwon, J-MPark, Hyeon KeoIn, YongkyoonLee, WLee, K.D.Yun, G.S.Lee, JKim, MKo, W.-H.Lee, J.H.Park, Y.S.Na, Y.-S.Luhmann, NCPark, B.H.
Keywords
magnetic island; turbulence; multiscale interaction
Issue Date
201712
Publisher
IOP PUBLISHING LTD
Citation
NUCLEAR FUSION, v.57, no.12, pp.126058 -
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 T e 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.
URI
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DOI
http://dx.doi.org/10.1088/1741-4326/aa86fe
ISSN
0029-5515
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