Nonlinear Electromagnetic Stabilization of Plasma Microturbulence

Nonlinear Electromagnetic Stabilization of Plasma Microturbulence

The physical causes for the strong stabilizing effect of finite plasma β on ion-temperature-gradient-driven turbulence, which far exceeds quasilinear estimates, are identified from nonlinear gyrokinetic simulations. The primary contribution stems from a resonance of frequencies in the dominant nonli...

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Veröffentlicht in:Physical review letters 2018-04, Vol.120 (17), p.175002-175002, Article 175002
Hauptverfasser: Whelan, G G, Pueschel, M J, Terry, P W
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Energy transfer
Fluid dynamics
Heat flux
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creator Whelan, G G
Pueschel, M J
Terry, P W
description The physical causes for the strong stabilizing effect of finite plasma β on ion-temperature-gradient-driven turbulence, which far exceeds quasilinear estimates, are identified from nonlinear gyrokinetic simulations. The primary contribution stems from a resonance of frequencies in the dominant nonlinear interaction between the unstable mode, the stable mode, and zonal flows, which maximizes the triplet correlation time and therefore the energy transfer efficiency. A modification to mixing-length transport estimates is constructed, which reproduces nonlinear heat fluxes throughout the examined β range.
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subjects Energy transfer
Fluid dynamics
Heat flux
title Nonlinear Electromagnetic Stabilization of Plasma Microturbulence
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