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Anisotropic e × B shearing rate in a magnetic island : Anisotropic ExB shearing rate in a magnetic island
Cited 16 time in
Web of Science
Cited 16 time in Scopus
- Authors
- Issue Date
- 2021-02
- Publisher
- American Institute of Physics
- Citation
- Physics of Plasmas, Vol.28 No.2, p. 022302
- Abstract
- © 2021 Author(s).We derive the E × B shearing rate associated with vortex flow inside a macroscopic magnetic island (MI) in axisymmetric toroidal geometry. Due to the elongation of the MI and incompressibility of the E × B flow, the shearing rate near X-points is much lower than that near the mid-plane (x-axis of the local Cartesian coordinate) of the MI on the same flux surface. Furthermore, the rate formally vanishes at the X-points where the local poloidal magnetic field associated with the MI stagnates. This calculation of E × B shearing profile and, in particular, minimal E × B shear near the X-points is consistent with the recent experimental finding that turbulence tends to spread into an MI through regions around the X-points [K. Ida et al., Phys. Rev. Lett. 120, 245001 (2018)] and can contribute to more thorough quantitative interpretation of the results from experiments and simulations.
- ISSN
- 1070-664X
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