Relativistic electron beam neutralization in a dense magnetized plasma

Abstract

[[abstract]]For the case of a longitudinal magnetic guide field this problem has been treated neglecting ion dynamics [R. Lee and R. N. Sudan, Phys. Fluids 14, 1213 (1971)]. Under the assumptions Ωe ≫ ωpe,Ωi ≫ ωpi, where ωp, Ω are plasma and gyrofrequencies, there is no neutralization because both electrons and ions are tied to field lines. When Ωe ≫ ωpe and Ωi < ωpi, it is essential to consider ion dynamics since the ions play the dominant role in neutralization. In the final state, the beam is essentially neutralized both electrically and magnetically and the energy associated with plasma oscillations is a small fraction of the beam energy except when the radius of the beam is small compared with the plasma skin depth.[[fileno]]2010126010001[[department]]物理