100-kT Magnetic field generation using paisley targets by femtosecond laser-plasma interactions

TL;DR

This paper demonstrates that paisley-patterned targets irradiated by femtosecond lasers can generate extremely strong magnetic fields up to 150-kT, with a simple model explaining the dependence on laser parameters and design modifications extending field lifetime.

Contribution

The study introduces a novel paisley-shaped target design for laser-induced magnetic field generation, providing a robust and scalable approach with a simple predictive model.

Findings

Generated 100-kT magnetic fields with paisley targets.

Achieved 150-kT magnetic fields at high laser intensity.

Extended magnetic field lifetime using double paisley configuration.

Abstract

A target using a paisley pattern generates 100-kT-level magnetic fields. Laser irradiation induces local charge separation on the target, which creates surface currents along the concave surface, generating a magnetic field. For a laser intensity of $10^{21}$ W/cm$^2$, the target generates a 150-kT magnetic field. We developed a simple model to describe the magnetic field as a function of laser intensity and target radius. A double paisley configuration extends the lifetime of the magnetic field to the picosecond scale. The paisley design generates comparable results even if it is simplified. Thus, it is a robust and modular target suitable for magnetic field applications such as 100-kT magnetic field generation and magnetic reconnection.