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Electron diffusion in a sheared unperturbed magnetic field and an electrostatic stochastic field

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Published 28 November 2006 2006 The Royal Swedish Academy of Sciences
, , Citation I Petrisor et al 2007 Phys. Scr. 75 1 DOI 10.1088/0031-8949/75/1/001

1402-4896/75/1/1

Abstract

The electron diffusion induced by a two-dimensional electrostatic turbulence, in a sheared slab approximation of the toroidal magnetic geometry, is studied firstly using the decorrelation trajectory method (DCT), secondly by direct numerical simulation. The former semi-analytical method allows us to go beyond the Corrsin approximation, thus allowing for a non-classical analysis of the particle trapping phenomenon. The DCT results are compared to the transport properties of the electrons obtained by numerical simulations assuming an isotropic spectrum of electrostatic drift type turbulence that is Gaussian for small wavevectors and power-law k−3 for large wavevectors. The 'radial' and the 'poloidal' running and asymptotic diffusion coefficients of thermal electrons are obtained for physically relevant parameter values. The existence of enhanced diffusion in the poloidal direction is observed in the presence of magnetic shear. The agreement between the semi-analytical method and the purely numerical method is pointed out.

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10.1088/0031-8949/75/1/001