# Full particle-in-cell simulation of the interaction between two plasmas for laboratory experiments on the generation of magnetized collisionless shocks with high-power lasers

## TL;DR

This study uses one-dimensional particle-in-cell simulations to explore how magnetized plasmas interact and form collisionless shocks, highlighting the role of spontaneous magnetic fields in shock generation during laser experiments.

## Contribution

It demonstrates the critical influence of spontaneous magnetic fields in Aluminum plasmas on the formation of perpendicular collisionless shocks in laboratory conditions.

## Key findings

- Sharp electron density and magnetic field jumps at plasma interfaces.
- Magnetized Aluminum plasma causes strong compression during ion gyration.
- Spontaneous magnetic fields are essential for shock formation.

## Abstract

A preliminary numerical experiment is conducted for laboratory experiments on the generation of magnetized collisionless shocks with high-power lasers by using one-dimensional particle-in-cell simulation. The present study deals with the interaction between a moving Aluminum plasma and a Nitrogen plasma at rest. In the numerical experiment, the Nitrogen plasma is unmagnetized or magnetized by a weak external magnetic field. Since the previous study suggested the generation of spontaneous magnetic field in the piston (Aluminum) plasma due to the Biermann battery, the effect of the magnetic field is of interest. Sharp jumps of electron density and magnetic field are observed around the interface between the two plasmas as long as one of the two plasmas is magnetized, which indicates the formation of tangential electron-magneto-hydro-dynamic discontinuity. When the Aluminum plasma is magnetized, strong compression of both density and magnetic field takes place in the pure Aluminum plasma during the gyration of Nitrogen ions in the Aluminum plasma region. The formation of a shock downstream is indicated from the shock jump condition. The result suggests that the spontaneous magnetic field in the piston (Aluminum) plasma plays an essential role in the formation of a perpendicular collisionless shock.