TL;DR
This paper explores how singular laser wavefronts interact with plasma to generate ion-acoustic vortices and strong magnetic fields, revealing new mechanisms for plasma manipulation using ultrashort laser pulses.
Contribution
It introduces a novel interaction mechanism where singular laser beams excite ion-acoustic vortices and generate magnetic fields in plasma, with analytical configurations and experimental parameter ranges.
Findings
Ion-acoustic waves are excited via Brillouin resonance.
Orbital angular momentum transfers to plasma, creating vortices.
Helical currents produce kilogauss magnetic fields.
Abstract
The interaction of the two counter-propagating ultrashort laser pulses with a singular wavefronts in the thin slice of the underdense plasma is considered. It is shown that ion-acoustic wave is excited via Brillouin three-wave resonance by corkscrew interference pattern of a paraxial singular laser beams. The orbital angular momentum carried by light is transferred to plasma ion-acoustic vortex. The rotation of the density perturbations of electron fluid is the cause of helical current which produce the kilogauss axial quasi-static magnetic field. The exact analytical configurations are presented for an ion-acoustic current field and magnetic induction. The range of experimentally accessible parameters is evaluated.
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