Bifurcation in electrostatic resistive drift wave turbulence

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dc.creatorNumata, Ryusuke
dc.creatorBall, Rowena
dc.creatorDewar, Robert L.
dc.date2007-08-31
dc.date.accessioned2026-07-07T10:18:15Z
dc.date.available2026-07-07T10:18:15Z
dc.descriptionThe Hasegawa-Wakatani equations, coupling plasma density and electrostatic potential through an approximation to the physics of parallel electron motions, are a simple model that describes resistive drift wave turbulence. We present numerical analyses of bifurcation phenomena in the model that provide new insights into the interactions between turbulence and zonal flows in the tokamak plasma edge region. The simulation results show a regime where, after an initial transient, drift wave turbulence is suppressed through zonal flow generation. As a parameter controlling the strength of the turbulence is tuned, this zonal flow dominated state is rapidly destroyed and a turbulence-dominated state re-emerges. The transition is explained in terms of the Kelvin-Helmholtz stability of zonal flows. This is the first observation of an upshift of turbulence onset in the resistive drift wave system, which is analogous to the well-known Dimits shift in turbulence driven by ion temperature gradients.
dc.description21 pages, 11 figures
dc.identifierhttps://arxiv.org/abs/0708.4317
dc.identifierhttp://arxiv.org/abs/0708.4317
dc.identifierPhys. Plasmas 14, 102312-1--8 (2007)
dc.identifierdoi:10.1063/1.2796106
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/174127
dc.subjectPlasma Physics
dc.titleBifurcation in electrostatic resistive drift wave turbulence
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