Multi-scale interactions of microtearing turbulence in the tokamak pedestal
MJ Pueschel, DR Hatch, M Kotschenreuther… - Nuclear …, 2020 - iopscience.iop.org
Nuclear Fusion, 2020•iopscience.iop.org
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.
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.
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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