English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The filamentation instability driven by two spatially uniform andcounter-streaming beams of charged particles in plasmas is modelled by aparticle-in-cell (PIC) simulation. Each beam consists of the electrons andpositrons. The four species are equally dense and they have the sametemperature. The one-dimensional simulation direction is orthogonal to the beamvelocity vector. The magnetic field grows spontaneously and rearranges theparticles in space, such that the distributions of the electrons of one beamand the positrons of the second beam match. The simulation demonstrates that asa result no electrostatic field is generated by the magnetic field through itsmagnetic pressure gradient prior to its saturation. This electrostatic fieldwould be repulsive at the centres of the filaments and limit the maximum chargeand current density. The filaments of electrons and positrons in thissimulation reach higher charge and current densities than in one with nopositrons. The oscillations of the magnetic field strength induced by themagnetically trapped particles result in an oscillatory magnetic pressuregradient force. The latter interplays with the statistical fluctuations in theparticle density and it probably enforces a charge separation, by whichelectrostatic waves grow after the filamentation instability has saturated.

Simulation study of the filamentation of counter-streaming beams of the electrons and positrons in plasmas