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Influence of magnetic shear and stochastic electrostatic field on the electron diffusion

M. NEGREA1,* , I. PETRISOR1, B. WEYSSOW2

Affiliation

  1. Department of Physics, University of Craiova, 13 A.I. Cuza Street, 200585 Craiova, Dolj, Association EURATOM-MEdC, Romania
  2. Department of Statistical Physics and Plasma, Association EURATOM-Etat Belge, Université Libre de Bruxelles, Belgium

Abstract

The electron diffusion induced by a two-dimensional electrostatic turbulence, in a sheared slab approximation of the toroidal magnetic geometry, is studied by direct numerical simulation. The transport properties of the electrons are 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 wave-vectors. The ‘radial’ and the ‘poloidal’ running and asymptotic diffusion coefficients of electrons are obtained for physically relevant parameter values and the existence of an enhanced diffusion in the poloidal direction is observed in the presence of magnetic shear..

Keywords

Magnetic shear, Electrostatic turbulence, Direct numerical simulations.

Submitted at: March 1, 2008
Accepted at: July 10, 2008

Citation

M. NEGREA, I. PETRISOR, B. WEYSSOW, Influence of magnetic shear and stochastic electrostatic field on the electron diffusion, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 8, pp. 1942-1945 (2008)