Global E x B flow pattern formation and saturation

Lei Qi

doi:10.1088/1741-4326/ac906f

2022-10-17

DOI：10.1088/1741-4326/ac906f

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摘要

En 中文

The E x B flow staircase-like pattern observed in the first principle gyrokinetic numerical experiments of tokamak fusion plasmas forms due to a nonlinear time delay. Simulations demonstrate a finite time delay between the staircase occurrence in particle transport and that in the density profile. This novel finding shows that instability can arise from perturbations in transport and then influence the background turbulence. E x B flow staircase plays roles not only in shearing the transport but also as a nonlinear saturation mechanism of staircase instability. Experimental measurements in KSTAR tokamak L-mode plasmas are consistent with the numerical findings.

Keyword:

E x B flow

staircases

nonlinear time delay

pattern formation

trapped electron mode

gyrokinetic simulation

期刊

Nuclear Fusion

IF:

论文数:

9.3K

被引数:

2.2W

机构

seoul national university (snu)

学者数:

7.2W

论文数: 6.6W

被引数: 86

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