Eur. Phys. J. D (2012) 66: 283
https://doi.org/10.1140/epjd/e2012-30331-x

Regular Article

Enhanced heat conductivity in stochastic magnetic field of tokomak affected by the ratio of the parallel to the perpendicular heat diffusivity

Department of Physics, Dalian Maritime University, Dalian 116026, P.R. China

^a e-mail: phygao@gmail.com

Received: 25 May 2012
Received in final form: 6 September 2012
Published online: 20 November 2012

Abstract

Electron heat transport across stochastic magnetic fields is studied numerically in order to find out how the ratio of the parallel to the perpendicular heat diffusivity affects the enhanced heat conductivity and its radial profile in tokomak plasma physics. To find out the details of profile, non-local stochastic magnetic fields, in which the perturbed magnetic islands are separated with each other but very close to in the minor radius of tokomak, are chosen as research objects in our simulation work. Our numerical results indicate that the ratio of the parallel to the perpendicular heat diffusivity is a very important effective factor, which dominate how far the enhanced conductivity contributed by a perturbed magnetic field approach to zero from the rational surface in minor radius. Besides that, a theoretical analysis was provided and compared with the numerical results in this article.