Mechanism of generating collisionless shock in magnetized gas plasma driven by laser-ablated target plasma

TL;DR

This paper investigates how collisionless shocks form in magnetized gas plasma driven by laser-ablated targets using particle-in-cell simulations, revealing the roles of precursors and injection timing.

Contribution

It introduces a detailed simulation study showing the formation mechanisms of seed-shocks and the influence of target plasma injection timing on precursor development.

Findings

Precursor driven by gyrating ions varies with injection time.

Seed-shock formation depends on the presence of a recursor.

Propagating seed-shock exhibits supercritical shock behavior.

Abstract

Mechanism of generating collisionless shock in magnetized gas plasma driven by laser-ablated target plasma is investigated by using one-dimensional full particle-in-cell simulation. The effect of finite injection time of target plasma, mimicking finite width of laser pulse, is taken into account. It was found that the formation of a seed-shock requires a recursor. The precursor is driven by gyrating ions, and its origin varies depending on the injection time of the target plasma. When the injection time is short, the target plasma entering the gas plasma creates a precursor, otherwise, gas ions reflected by the strong piston effect of the target plasma create a precursor. The precursor compresses the background gas plasma, and subsequently, a compressed seed-shock forms in the gas plasma. The parameter dependence on the formation process and propagation characteristics of the seed-shock was discussed. It was confirmed that the seed-shock propagates through the gas plasma exhibiting behavior similar to the shock front of supercritical shocks.