Multi-scale interactions of microtearing turbulence in the tokamak pedestal

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

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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 languageEnglish
Article number124005
Number of pages5
JournalNuclear Fusion
Volume60
Issue number12
DOIs
Publication statusPublished - Dec 2020

Keywords

  • H-mode pedestal
  • microtearing
  • multiscale turbulence
  • zonal fields
  • zonal flows

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