Kinetic plasma waves carrying orbital angular momentum
Abstract
The structure of Langmuir plasma waves carrying a finite orbital angular momentum is revised in the paraxial 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 a 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 quasistatic axial and azimuthal magnetic fields which result from the orbital and longitudinal momenta transported with the wave, respectively.
- Publication:
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Physical Review E
- Pub Date:
- July 2019
- DOI:
- 10.1103/PhysRevE.100.013204
- arXiv:
- arXiv:1903.08955
- Bibcode:
- 2019PhRvE.100a3204B
- Keywords:
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- Physics - Plasma Physics
- E-Print:
- Phys. Rev. E 100, 013204 (2019)