Density of untrapped electrons near a particle of a plasma

摘要: Abstract We derive the exact formula for number density of a single beam field electrons falling on test electron or positive ion, by assuming test-field interactions only. It is shown that occupies focus an empty parabolic envelope formed hyperbolic trajectories electrons. No similar region observed in case ion. In accordance with conventional theory, force exerted charge found both cases to depend inverse square velocity and be log-divergent at large distances. By adding over partial beams, untrapped near particle plasma expressed as integral relative distribution infinity equilibrium results are recovered.