Anomalous diffusion, clustering, and pinch of impurities in plasma edge turbulence

Details Anomalous diffusion, clustering, and pinch of impurities in plasma edge turbulence Anomalous diffusion, clustering, and pinch of impurities in plasma edge turbulence

2005-01-07

arxiv.org/abs/physics/0501039v1

Physics

Plasma Physics

This article has been submitted to Physics of Plasmas. After it is published, it will be found at http://pop.aip.org/pop/

Scientific paper

10.1063/1.1933779

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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