Evolution of magnetic Kubo number of stochastic magnetic fields during the edge pedestal collapse simulation

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Using a statistical correlation analysis, we compute the evolution of the magnetic Kubo number during an edge pedestal collapse in nonlinear reduced magnetohydrodynamic simulations. The Kubo number is found not to exceed the unity in spite of performing the simulation with a highly unstable initial pressure profile in the ideal ballooning mode. During the edge pedestal collapse, the Kubo number is within the values of 0.2 and 0.6 suggesting that the quasilinear diffusion model is sufficient to explain the energy loss mechanism during the pedestal collapse. Temporal evolution of poloidal correlation lengths of pressure fluctuations resembles with that of the Chirikov parameter and the Kubo number, while radial correlation lengths of the pressure fluctuations are strongly correlated with the radial width of the magnetic stochastic layer. © 2018 Author(s).
Publisher
AMER INST PHYSICS
Issue Date
2018-08
Language
English
Article Type
Article
Citation

PHYSICS OF PLASMAS, v.25, no.8

ISSN
1070-664X
DOI
10.1063/1.5025687
URI
http://hdl.handle.net/10203/248238
Appears in Collection
NE-Journal Papers(저널논문)
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