Self-similar collapse in a circular magnetic field and electron beam jets by hybrid transverse plasmon

TL;DR

This paper investigates how self-generated magnetic fields influence the collapse and jet formation of electron beams in plasma, providing insights into their dynamics and potential applications in laboratory and space environments.

Contribution

It introduces a dispersion relation for circular magnetic fields in plasma and demonstrates the magnetic field's role in jet collimation and growth rate modulation.

Findings

Magnetic field strength affects modulation instability growth rate.

Self-similar collapse leads to electron jet formation.

Jet velocities align with experimental data.

Abstract

Based on the set of nonlinear coupling equations describing the interaction of the high-frequency field, the self-generated magnetic field and the ion-acoustic field, the dispersion relation for the circular magnetic field is obtained. The numerical results indicate that the strength of the magnetic field have influence on the growth rate of modulation instability. The self-generated magnetic field has the tendency to self-similar collapse which makes the electron escapes along the axial region and form collimated jets. The velocity of jets is calculated and the results are consistent with experimental observations. The research may be applied to understand the dynamic process of electron beam jets in laboratory and space plasma.