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

Research output: Contribution to journal › Article › Academic › peer-review

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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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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. ",

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AU - Merlo, G.

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