Kinetic plasma waves carrying orbital angular momentum
Plasma Physics
2019-07-24 v1
Abstract
The structure of Langmuir plasma waves carrying a finite angular orbital momentum is revised in the paraxial optics approximation. It is shown that the kinetic effects related to higher-order momenta of the electron distribution function lead to coupling of Laguerre-Gaussian modes and result in modification of the wave dispersion and damping. The theoretical analysis is compared to the three-dimensional particle-in-cell numerical simulations for a mode with orbital momentum l = 2. It is demonstrated that propagation of such a plasma wave is accompanied with generation of quasi-static axial and azimuthal magnetic fields which are consequence of the longitudinal and orbital momentum transported with the wave.
Cite
@article{arxiv.1903.08955,
title = {Kinetic plasma waves carrying orbital angular momentum},
author = {D. Blackman and R. Nuter and Ph. Korneev and V. T. Tikhonchuk},
journal= {arXiv preprint arXiv:1903.08955},
year = {2019}
}