The Modified Friction and Diffusion Coefficients of Fokker–Planck Equation and Relaxation Rates for Non-Maxwellian Scattering

摘要: In this paper, a new method to derive the Fokker–Planck coefficients defined by non-Maxwellian velocity distribution function for field particles is presented. The threefold integral and Debye cutoff parameter, which were introduced CHANG LI, are applied. Therefore, divergence difficulties customary replacement of relative g thermal vth naturally avoided. probability P(v,Δv) scattering derived choosing transfer Δv, true measure collision intensity, as an independent variable. enables difference between small-angle small-momentum-transfer collisions inverse-square force be well clarified. With help function, obtained normal original approach. friction diffusion equation modified used investigate relaxation processes weakly coupled plasma. profiles rates show that slowing down deflection weakened in conditions scattering.