Multi-scale interactions of microtearing turbulence in the tokamak pedestal. (29th October 2020)

• Record Type: Journal Article
• Authors: Pueschel, M.J.; Hatch, D.R.; Kotschenreuther, M.; Ishizawa, A.; Merlo, G.
• Is Part Of: Nuclear fusion. Volume 60:Number 12(2020)
• Publication Date: 2020-10-29
• Subjects: microtearing -- multiscale turbulence -- H-mode pedestal -- zonal flows -- zonal fields; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/1741-4326/abba49
• Languages: English
• ISSNs: 0029-5515

Abstract

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.