Non-equilibrium Plasma Collision Term And Theoretical Studies Of The Transport Coefficients

Usually the states of the field particles were assumed in the motion equilibrium and the Maxwellian approximation substituted for the non-Maxwellian velocity distribution function in despite of the states were mostly in the nonequilibrium.Then the Maxwellian velocity distribution was applied in any condition and the thermal velocity replaced the real velocity of the field particles.In this paper,the new method is introduced to derive the Fokker-Planck coefficients with a non-Maxwellian velocity distribution function for the field particles.The three-fold integral and the new Debye cutoff parameter,which were introduced in previous papers[1,2],have been applied so that the divergence difficulties can be avoided.The probability function P(v,â–³v)for non-Maxwellian scatters is derived which helps to calculate the Fokker-Planck coefficients.The friction and diffusion coefficients of Fokker-Planck equation are modified and are exerted to investigate the relaxation and transport processes for weakly and moderately coupled plasma.