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On the interaction of focused electromagnetic beams and space-charge fields in laser-plasma systems

Published online by Cambridge University Press:  25 September 2012

Alexandre Bonatto ,
Renato Pakter ,
Felipe Barbedo Rizzato  and
Cristian Bonatto
Alexandre Bonatto*
Affiliation:
Instituto de Física, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
Renato Pakter
Affiliation:
Instituto de Física, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
Felipe Barbedo Rizzato
Affiliation:
Instituto de Física, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
Cristian Bonatto
Affiliation:
Instituto de Física, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
*
Address correspondence and reprint requests to: Alexandre Bonatto, Instituto de fisica, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, Port Alegre 91501-970, Brasil. E-mail: abonatto@if.ufrgs.br
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Abstract

In the present analysis we study the weakly nonlinear coupled dynamics involving focused radiation beams and space-charge fields in laser-plasmas systems. We direct the analysis to regimes evolving with the co-moving coordinate of the beam frame, but do not make any assumptions on paraxial or underdense conditions. The model thus constructed allows us to investigate equilibrium and nonequilibrium regimes alike. Dependence of equilibrium profiles on control parameters is examined, and beam stability and evolution is investigated as one adds small mismatches to the ideally matched equilibrium. Details of beam evolution depend on initial conditions. However, independently of the precise form of initial conditions, mismatched beams evolve to incoherent space-time patterns.

Type
Research Article
Information
Laser and Particle Beams , Volume 30 , Issue 4 , December 2012 , pp. 583 - 590
Copyright
Copyright © Cambridge University Press 2012

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References

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