Dynamic plasma screening effects on electron-ion Coulomb bremsstrahlung in the Lorentzian distribution plasma

Abstract

Dynamic plasma screening effects are investigated on classical bremsstrahlung electron-ion Coulomb scattering in a generalization Lorentzian (kappa) velocity distribution plasma. The electron-ion interaction potential is obtained by introduction of the plasma dielectric function. A semiclassical straight-line trajectory method is applied to the path of the projectile electron. The results show that the differential bremsstrahlung radiation cross section including the dynamic plasma screening effect is increased as an increase of the spectral index κ. In other words, the radiation spectrum in a thermal distribution plasma is found to be stronger than that in the nonthermal distribution plasma. It is also found that the plasma screening effects on the bremsstrahlung are more effective for the hard photon radiation. When the projectile velocity is greater than the electron thermal velocity, then, the interaction potential is almost unshielded.