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Ring formation in electromagnetic beams propagating in a magnetoplasma

Published online by Cambridge University Press:  01 April 2009

SHIKHA MISRA  and
S. K. MISHRA
SHIKHA MISRA
Affiliation:
Ramanna Fellowship Program, Department of Education Building, Lucknow University, Lucknow 226 007, India ([email protected])
S. K. MISHRA
Affiliation:
Ramanna Fellowship Program, Department of Education Building, Lucknow University, Lucknow 226 007, India ([email protected])
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Abstract

This paper presents an analysis (in the paraxial approximation) of a self-consistent, steady-state, theoretical model, which explains the ring formation in a Gaussian electromagnetic beam propagating in a magnetoplasma, characterized by ponderomotive and collisional nonlinearities. The condition for the formation of a dark and a bright ring has been derived analytically and the focusing/defocusing of the beam has been investigated in the different regimes. Further, the effect of the magnetic field and the nature of the nonlinearity on the ring formation and self focusing of the beam have also been explored.

Type
Papers
Information
Journal of Plasma Physics , Volume 75 , Issue 6 , December 2009 , pp. 769 - 785
Copyright
Copyright © Cambridge University Press 2009

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