Theory of Classical and Anomalous Diffusion of a Plasma across a Magnetic Field

概要

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The diffusion coefficient of the electrons across a magnetic field (with strength B) is calculated in terms of the spectral function of the electric-field functuations. The calculation is based on the microscopic evaluations of the first and second moments of the guiding-center displacements under the action of the fluctuating electric field in an inhomogeneous plasma. For a Maxwellian plasma, it is found that the diffusion coefficient contains an anomalous term D_⊥^* in addition to the usual classical term; D_⊥^* is proportional to B^<-1> when ω_e^2(1+T_e/T_1)≫Ω_e^2, and to B^2 In B when ω_e^2(1+T_e/T_1)≪Ω_e^2, where ω_e is the electron plasma frequency, and Ω_e, the electron cyclotron frequency. The contributions of the like-particle interactions vanish identically in the idiffusion coefficient.
社団法人日本物理学会の論文
1974-02-15