Multi-scale interactions of microtearing turbulence in the tokamak pedestal

M. J. Pueschel; D. R. Hatch; M. Kotschenreuther; A. Ishizawa; G. Merlo

doi:10.1088/1741-4326/abba49

Multi-scale interactions of microtearing turbulence in the tokamak pedestal

M. J. Pueschel (Corresponding author), D. R. Hatch, M. Kotschenreuther, A. Ishizawa, G. Merlo

Science and Technology of Nuclear Fusion

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Abstract

Microtearing turbulence in an idealized pedestal scenario is found to saturate via zonal fields, while also exciting strong zonal flows; a concurrent upshift of the non-linear critical gradient is observed. The zonal flows cause electron-temperature-gradient-driven turbulence to be ameliorated. When applying resonant magnetic perturbations, the prompt charge loss off the flux surface erodes the zonal flow, leading to higher electron-scale fluxes, while leaving microtearing saturation physics unaffected.

Original language	English
Article number	124005
Number of pages	5
Journal	Nuclear Fusion
Volume	60
Issue number	12
DOIs	https://doi.org/10.1088/1741-4326/abba49
Publication status	Published - Dec 2020

Keywords

H-mode pedestal
microtearing
multiscale turbulence
zonal fields
zonal flows

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10.1088/1741-4326/abba49

article: Multi-Scale Interactions of Microtearing Turbulence in the Tokamak PedestalSubmitted manuscript, 185 KB

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AU - Hatch, D. R.

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AU - Ishizawa, A.

AU - Merlo, G.

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KW - H-mode pedestal

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KW - zonal flows

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Multi-scale interactions of microtearing turbulence in the tokamak pedestal

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