Magetostatic amplifier with tunable maximum by twisted-light plasma interactions

TL;DR

This paper demonstrates that a small magnetostatic seed can enable continuous and intense transfer of orbital angular momentum from Laguerre-Gaussian lasers to plasmas, significantly amplifying magnetic fields.

Contribution

The study reveals a novel mechanism for sustained magnetic field amplification via OAM transfer in plasma-laser interactions, confirmed by 3D-PIC simulations.

Findings

Continuous enhancement of magnetostatic fields observed.

Space-uniform and time-stable magnetic fields produced.

Magnetic field strength reaches levels comparable to electron Larmor frequency.

Abstract

Laser beams with Laguerre-Gaussian (LG) mode carry orbital angular momentum (OAM), however when interacting with plasmas, the net OAM acquired by plasmas is basically zero after interaction. Here, we find when there exist a small magetostatic seed along laser propagation direction, the barrier would be broken, giving rise to dramatic OAM transfer from LG lasers to plasmas. Hence, the net OAM remained in plasmas system would continuously enhance the magetostatic field, until the corresponding Larmor frequency of electrons is comparable to the laser frequency in vacuum. Three-dimensional particle-in-cell (3D-PIC) simulations are performed to confirm our theory, producing space-uniform, time-stable and extremely intense magetostatic fields.