Current neutralization and plasma polarization for intense ion beams propagating through magnetized background plasmas in a two-dimensional slab approximation

Abstract

A two-dimensional electromagnetic Particle-in-Cell (PIC) simulation model is proposed to study the propagation of intense ion beams with beam width w_b small compared to the electron skin depth c/ω_pe through background plasmas in the presence of external applied magnetic fields. The effective electron gyroradius w_ge is found to be an important parameter for ion beam transport in the presence of magnetic fields. In the beam regions, the background plasmas respond differently to the ion beam of width w_b<w_ge and w_b>w_ge for the given magnetic field and beam energy. For the case of beam width w_b<w_gewith relative weak external magnetic fields, the rotation effects of plasma electrons are found to be significant and contributes to the significant enhancement of the self-electric and self-magnetic fields. While for the case of beam width w_b>w_ge with relative strong external magnetic fields, the rotation effects of plasma electrons are strongly inhibited and a well neutralization of ion beam current can be found. Finally, the influences of different beam widths, beam energies and magnetic fields on the neutralization of ion beam current are summarized for the cases of w_b<w_ge<c/ω_ge, w_ge<w_b<c/ω_pe and w_b<c/ω_pe<w_ge.

Graphical abstract

Keywords

current neutralization / ion beams / magnetized plasmas / Particle-in-Cell simulations

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