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Abstract: The Hasegawa-Wakatani equations, coupling plasma density and electrostaticpotential through an approximation to the physics of parallel electron motions,are a simple model that describes resistive drift wave turbulence. We presentnumerical analyses of bifurcation phenomena in the model that provide newinsights into the interactions between turbulence and zonal flows in thetokamak plasma edge region. The simulation results show a regime where, afteran initial transient, drift wave turbulence is suppressed through zonal flowgeneration. As a parameter controlling the strength of the turbulence is tuned,this zonal flow dominated state is rapidly destroyed and a turbulence-dominatedstate re-emerges. The transition is explained in terms of the Kelvin-Helmholtzstability of zonal flows. This is the first observation of an upshift ofturbulence onset in the resistive drift wave system, which is analogous to thewell-known Dimits shift in turbulence driven by ion temperature gradients.



Autor: Ryusuke Numata, Rowena Ball, Robert L. Dewar

Fuente: https://arxiv.org/







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