适用于中等耦合等离子体的碰撞算子

完全电离等离子体中，当试探粒子分布函数f_α是关于试探粒子速度v_α的偶函数时，导出了一个新的动力学方程的碰撞算子.该碰撞算子同时包括了大角散射(库仑近碰撞)和小角散射(库仑远碰撞)的二体碰撞的贡献,因此，该碰撞算子同时适用于弱耦合(库仑对数lnΛ≥10)和中等耦合(库仑对数2≤lnΛ≤10)等离子体.而且经过修改的碰撞算子和Rosenbluth势有直接的联系，当试探粒子和场粒子满足条件m_αm_β(如电子-离子碰撞或Lor 关键词： 中等耦合等离子体 小角散射 大角散射 碰撞算子

Collision operator for moderately coupled plasma

A new approach has been developed to treat large-angle and small-angle binary collisions in plasmas when the test particles' distribution function f_α is an even function about the test velocity v_α. In the approach, the Boltzmann collision operator is derived to be suitable for the plasma considered as weakly coupled (Coulomb logarithm ln Λ≥10) or moderately coupled (2≤lnΛ≤10). The modified collision operator has a direct and practical connection to the Rosenbluth potentials. In addition, with m_αm_β(such as electron-ion collision or Lorentz-gas model) and v_αv_β, the reduced electron-ion collision operator differs from the original Fokker-Planck operator for Coulomb collisions by terms of order 1/lnΛ.