Turbulence spreading induced vortex flow generation in a magnetic island

E.S. Yoon; T.S. Hahm; G.J. Choi; Y.W. Cho; A. Ishizawa; M.J. Choi; J.M. Kwon

doi:10.1088/1741-4326/ad82fa

Nuclear Fusion (Jan 2024)

Turbulence spreading induced vortex flow generation in a magnetic island

E.S. Yoon,
T.S. Hahm,
G.J. Choi,
Y.W. Cho,
A. Ishizawa,
M.J. Choi,
J.M. Kwon

Affiliations

E.S. Yoon: ORCiD; Department of Nuclear Engineering, Ulsan National Institute of Science and Technology , Ulsan 44919, Korea, Republic Of
T.S. Hahm: ORCiD; Nuclear Research Institute for Future Technology and Policy, Seoul National University , Seoul 08826, Korea, Republic Of
G.J. Choi: ORCiD; Nuclear Research Institute for Future Technology and Policy, Seoul National University , Seoul 08826, Korea, Republic Of
Y.W. Cho: ORCiD; School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore
A. Ishizawa: ORCiD; Graduate School of Energy Science, Kyoto University , Uji, Kyoto 611-0011, Japan
M.J. Choi: ORCiD; Korea Institute of Fusion Energy , Daejeon 34133, Korea, Republic Of
J.M. Kwon: ORCiD; Korea Institute of Fusion Energy , Daejeon 34133, Korea, Republic Of

DOI: https://doi.org/10.1088/1741-4326/ad82fa
Journal volume & issue: Vol. 64, no. 12
p. 126050

Abstract

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We derive a self-consistent relation between turbulence spreading flux and vortex flow acceleration for time-stationary turbulence inside a magnetic island (MI) by extending the Charney-Drazin momentum theorem. The result, which consists of flux-surface-averaged expressions with geometrical weight, indicates a dominant balance between the turbulence spreading flux through regions around X-points and the vortex flow away from the X-points on the same flux surface. This is in qualitative agreement with experimental observations from DIII-D, KSTAR and HL-2A.

Published in Nuclear Fusion

ISSN: 0029-5515 (Print); 1741-4326 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics: Nuclear and particle physics. Atomic energy. Radioactivity
Website: https://iopscience.iop.org/journal/0029-5515

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