Bifurcation in electrostatic resistive drift wave turbulence
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Numata, Ryusuke; Ball, Rowena; Dewar, Robert L.
Description
The 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...[Show more]
dc.contributor.author | Numata, Ryusuke | |
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dc.contributor.author | Ball, Rowena | |
dc.contributor.author | Dewar, Robert L. | |
dc.date.accessioned | 2015-11-09T01:04:27Z | |
dc.date.available | 2015-11-09T01:04:27Z | |
dc.identifier.issn | 1070-664X | |
dc.identifier.uri | http://hdl.handle.net/1885/16405 | |
dc.description.abstract | The 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.description.sponsorship | This work is supported by the Australian Research Council. | |
dc.format | 8 pages | |
dc.publisher | American Institute of Physics (AIP) | |
dc.rights | http://www.sherpa.ac.uk/romeo/issn/1070-664X..."Publishers version/PDF may be used on author's personal website, institutional website or institutional repository" from SHERPA/RoMEO site (as at 9/11/15). Copyright 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Physics of Plasmas and may be found at https://doi.org/10.1063/1.2796106 | |
dc.source | Physics of Plasmas | |
dc.subject | Keywords: Approximation algorithms; Bifurcation (mathematics); Computer simulation; Mathematical models; Numerical analysis; Parameter estimation; Thermal gradients; Tokamak devices; Drift wave turbulence; Electrostatic potential; Kelvin-Helmholtz stability; Coulom | |
dc.title | Bifurcation in electrostatic resistive drift wave turbulence | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 14 | |
dc.date.issued | 2007-10-26 | |
local.identifier.absfor | 020204 | |
local.identifier.ariespublication | u4056230xPUB69 | |
local.publisher.url | https://www.aip.org/ | |
local.type.status | Published Version | |
local.contributor.affiliation | Numata, Ryusuke, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Department of Theoretical Physics, The Australian National University | |
local.contributor.affiliation | Ball, Rowena, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Department of Theoretical Physics, The Australian National University | |
local.contributor.affiliation | Dewar, Robert, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Department of Theoretical Physics, The Australian National University | |
local.bibliographicCitation.issue | 10 | |
local.bibliographicCitation.startpage | 102312 | |
local.bibliographicCitation.lastpage | 8 | |
local.identifier.doi | 10.1063/1.2796106 | |
dc.date.updated | 2015-12-08T07:44:22Z | |
local.identifier.scopusID | 2-s2.0-36048942439 | |
Collections | ANU Research Publications |
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