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Autori: M. Vlad, F. Spineanu, S. Benkadda,
Editorial: Plasma Physics and Controlled Fusion, 50, p.065007, 2008.
Two models of turbulent pinches due to the inhomogeneity of the confining
magnetic field have been proposed: the curvature and the ratchet pinches.
The first is the effect of compressibility of the density due to the
divergence of the ExB drift and the second reflects the influence of
the magnetic field inhomogeneity on the trajectories. The relation between
these models is analyzed. The average velocity for the density advected by
the stochastic ExB drift is determined for quasi-linear and
nonlinear turbulence. We show that the density pinch velocity is the sum of
the ratchet and curvature pinches and that peaked density profiles can be
obtained due to ratchet effect in nonlinear turbulence in the presence of
Cuvinte cheie: turbulenta plasmei, metode statistice, test particle transport // plasma turbulence, statistical approaches, test