Secondary electron emission under magnetic constraint: from Monte Carlo simulations to analytical solution

TL;DR

This paper develops an analytical model for secondary electron emission in oblique magnetic fields, validated against Monte Carlo simulations, aiding the design of magnetically influenced applications.

Contribution

It introduces a new analytical formula derived from simulations that describes how magnetic field parameters affect secondary electron emission.

Findings

Analytical model accurately predicts emission under various magnetic conditions.

Magnetic field tilt and electric field influence emission rates.

Good agreement between analytical and simulation results across parameters.

Abstract

The secondary electron emission process is essential for the optimal operation of a wide range of applications, including fusion reactors, high-energy accelerators, or spacecraft. The process can be influenced and controlled by the use of a magnetic field. An analytical solution is proposed to describe the secondary electron emission process in an oblique magnetic field. It was derived from Monte Carlo simulations. The analytical formula captures the influence of the magnetic field magnitude and tilt, electron emission energy, electron reflection on the surface, and electric field intensity on the secondary emission process. The last two parameters increase the effective emission while the others act the opposite. The electric field effect is equivalent to a reduction of the magnetic field tilt. A very good agreement is shown between the analytical and numerical results for a wide range of parameters. The analytical solution is a convenient tool for the theoretical study and design of magnetically assisted applications, providing realistic input for subsequent simulations.