Multi-scale interactions of microtearing turbulence in the tokamak pedestal

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...

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Veröffentlicht in:	Nuclear fusion 2020-12, Vol.60 (12), p.124005
Hauptverfasser:	Pueschel, M.J., Hatch, D.R., Kotschenreuther, M., Ishizawa, A., Merlo, G.
Format:	Artikel
Sprache:	eng
Schlagworte:	H-mode pedestal microtearing multiscale turbulence zonal fields zonal flows
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description	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.
doi_str_mv	10.1088/1741-4326/abba49
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subjects	H-mode pedestal microtearing multiscale turbulence zonal fields zonal flows
title	Multi-scale interactions of microtearing turbulence in the tokamak pedestal
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