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Unusual dynamics and nonlinear thermal self-focusing of initially focused magnetoacoustic beams in a plasma
Abstract
Unusual thermal self-focusing of two-dimensional beams in plasma which axis is parallel to the equilibrium straight magnetic field is considered. The equi- librium parameters of plasma determine scenario of a beam divergence (usual or unusual) which is stronger as compared with a flow without magnetic field. Nonlinear thermal self-action of a magnetosonic beam behaves differently in the ordinary and unusual cases. Damping of wave perturbations and normal defocusing in gases leads to reduction of the magnitude of initially planar per- turbations at the axis of a beam. Additional thermal self-focusing nonspecific for gases occurs in plasma under some condition which counteracts this reduc- tion. The theory and numerical examples concern thermal self-action of initially focused (defocused) magnetosonic beam. Dynamics of perturbations in a beam is determined by dimensionless parameters responsible for diffraction, damp- ing of the wave perturbations, initial radius of a beam’s front curvature, and the ratio of viscous to thermal damping coefficients.
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
CONTRIBUTIONS TO PLASMA PHYSICS
no. 64,
pages 1 - 12,
ISSN: 0863-1042 - Language:
- English
- Publication year:
- 2024
- Bibliographic description:
- Perelomova A.: Unusual dynamics and nonlinear thermal self-focusing of initially focused magnetoacoustic beams in a plasma// CONTRIBUTIONS TO PLASMA PHYSICS -Vol. 64,iss. 1 (2024), s.1-12
- DOI:
- Digital Object Identifier (open in new tab) 10.1002/ctpp.202300052
- Sources of funding:
-
- COST_FREE
- Verified by:
- Gdańsk University of Technology
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