Absorption of charged particles in Perfectly-Matched-Layers by optimal damping of the deposited current

TL;DR

This paper introduces an optimized PML algorithm with damped particle currents to reduce numerical artifacts in Particle-In-Cell simulations, enhancing the absorption of charged particles at PML boundaries.

Contribution

The paper presents a novel PML method that uses analytically-derived damping of deposited currents to improve simulation accuracy.

Findings

Reduced numerical artifacts at PML interfaces.

Enhanced absorption efficiency of charged particles.

Validated improvements through practical simulations.

Abstract

Perfectly-Matched Layers (PML) are widely used in Particle-In-Cell simulations, in order to absorb electromagnetic waves that propagate out of the simulation domain. However, when charged particles cross the interface between the simulation domain and the PMLs, a number of numerical artifacts can arise. In order to mitigate these artifacts, we introduce a new PML algorithm whereby the current deposited by the macroparticles in the PML is damped by an analytically-derived, optimal coefficient. The benefits of this new algorithm is illustrated in practical simulations.