dorsal/arxiv
View SchemaAnomalous diffusion, clustering, and pinch of impurities in plasma edge turbulence
| Authors | M. Priego, O. E. Garcia, V. Naulin, J. Juul Rasmussen |
|---|---|
| Categories | |
| ArXiv ID | physics/0501039 |
| URL | https://arxiv.org/abs/physics/0501039 |
| DOI | 10.1063/1.1933779 |
Abstract
The turbulent transport of impurity particles in plasma edge turbulence is investigated. The impurities are modeled as a passive fluid advected by the electric and polarization drifts, while the ambient plasma turbulence is modeled using the two-dimensional Hasegawa--Wakatani paradigm for resistive drift-wave turbulence. The features of the turbulent transport of impurities are investigated by numerical simulations using a novel code that applies semi-Lagrangian pseudospectral schemes. The diffusive character of the turbulent transport of ideal impurities is demonstrated by relative-diffusion analysis of the evolution of impurity puffs. Additional effects appear for inertial impurities as a consequence of compressibility. First, the density of inertial impurities is found to correlate with the vorticity of the electric drift velocity, that is, impurities cluster in vortices of a precise orientation determined by the charge of the impurity particles. Second, a radial pinch scaling linearly with the mass--charge ratio of the impurities is discovered. Theoretical explanation for these observations is obtained by analysis of the model equations.
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"abstract": "The turbulent transport of impurity particles in plasma edge turbulence is\ninvestigated. The impurities are modeled as a passive fluid advected by the\nelectric and polarization drifts, while the ambient plasma turbulence is\nmodeled using the two-dimensional Hasegawa--Wakatani paradigm for resistive\ndrift-wave turbulence. The features of the turbulent transport of impurities\nare investigated by numerical simulations using a novel code that applies\nsemi-Lagrangian pseudospectral schemes. The diffusive character of the\nturbulent transport of ideal impurities is demonstrated by relative-diffusion\nanalysis of the evolution of impurity puffs. Additional effects appear for\ninertial impurities as a consequence of compressibility. First, the density of\ninertial impurities is found to correlate with the vorticity of the electric\ndrift velocity, that is, impurities cluster in vortices of a precise\norientation determined by the charge of the impurity particles. Second, a\nradial pinch scaling linearly with the mass--charge ratio of the impurities is\ndiscovered. Theoretical explanation for these observations is obtained by\nanalysis of the model equations.",
"arxiv_id": "physics/0501039",
"authors": [
"M. Priego",
"O. E. Garcia",
"V. Naulin",
"J. Juul Rasmussen"
],
"categories": [
"physics.plasm-ph",
"physics.comp-ph"
],
"doi": "10.1063/1.1933779",
"title": "Anomalous diffusion, clustering, and pinch of impurities in plasma edge turbulence",
"url": "https://arxiv.org/abs/physics/0501039"
},
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