Whelan GG, Pueschel MJ, Terry PW. Nonlinear Electromagnetic Stabilization of Plasma Microturbulence.
Phys Rev Lett 2018;
120:175002. [PMID:
29756837 DOI:
10.1103/physrevlett.120.175002]
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Abstract
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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