Toy model of the "fountain effect" for magnetic field generation in intense laser-solid interactions

TL;DR

This paper presents a simple geometrical model to estimate magnetic fields generated by the fountain effect in high-intensity laser-solid interactions, providing a scaling law for the magnetic field at the target's rear surface.

Contribution

It introduces a novel, straightforward model to analyze the fountain effect and derive magnetic field scaling in laser-irradiated solid targets.

Findings

Proposes a simple geometrical fountain model.

Derives a scaling law for magnetic field generation.

Provides insights into electron dynamics in laser interactions.

Abstract

A very simple "geometrical" model of a fountain is analyzed to evaluate the net flow on the ground resulting from the superposition of the source and the falling streams. On this basis we suggest a scaling for the magnetic field generated at the rear surface of high-intensity laser-irradiated solid targets due to the "fountain effect" related to fast electrons escaping in vacuum.