Heat Diffusion across a Strong Stochastic Magnetic Field in Tokamak Plasmas

We investigate heat diffusion across a local strong stochastic magnetic field by using eleven low-m perturbed magnetic islands. A maximum stochasticity of 38.82 between two neighboring rational surfaces is attained. The correlation between the effective radial heat conductivity χ_r and the ratio of the parallel heat diffusion coefficient to the perpendicular coefficient, χ_||/χ_⊥, is numerically studied and compared with earlier work.