| Autor: |
Hahm, T. S., Kim, Y. J., Diamond, P. H., Choi, G. J. |
| Předmět: |
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| Zdroj: |
Physics of Plasmas; Feb2021, Vol. 28 Issue 2, p1-6, 6p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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