Nonlinear Sciences – Pattern Formation and Solitons
Scientific paper
2009-06-02
Phys.Lett.A, v.374, 4523-4527, (2010)
Nonlinear Sciences
Pattern Formation and Solitons
6 pages, 2 figures, accepted to publication in Physics Letters A
Scientific paper
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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