Vlasov-Poisson simulation study of phase-space hole coalescence in a cylindrically wave-guided plasma

TL;DR

This paper investigates the coalescence of phase-space holes in a cylindrically wave-guided plasma using kinetic simulations, revealing the vortical fluid-like behavior of these structures and their parametric interactions.

Contribution

It introduces a phase-space hydrodynamic analogy to analyze hole coalescence, providing new insights into their vortical nature and interaction mechanisms.

Findings

Coalescence driven by phase-space velocity field interactions.

Parametric relations between hole characteristics established.

Vortical fluid analogy effectively describes phase-space hole dynamics.

Abstract

In this work, coalescence of phase-space holes of collision-less, one-dimensional plasmas is studied using kinetic simulation techniques. Phase-space holes are well-known Bernstein-Greene-Kruskal waves known for exhibiting coalescence, are numerically simulated and their coalescence is observed. Relations between the hole speed, potential, phase-space vorticity and phase-space depth are then obtained using the simulation data. This study involves the study of electron phase-space hole coalescence in a cylindrically wave-guided plasma. Using the recently developed phase-space hydrodynamic analogy, it is shown that the coalescence phenomena can be explored in terms of the fluid-analogous vortical nature of the phase-space holes. Coalescence occurs due to the interaction of the phase-space velocity fields associated with these phase-space vortices. Results obtained from the study describes various parametric relations between the coalesced hole characteristics and the characteristics of the colliding holes.