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Sökning: swepub > Umeå universitet > Engelska > Kourakis I. > Refereegranskat

  • Resultat 1-8 av 8
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  • Shukla, Padma K., et al. (författare)
  • Instability and dynamics of two nonlinearly coupled laser beams in a plasma
  • 2006
  • Ingår i: Physics of Plasmas. - 1070-664X. ; 13:5, s. 053104-1-053104-7
  • Tidskriftsartikel (refereegranskat)abstract
    • The nonlinear interaction between two laser beams in a plasma is investigated in the weakly nonlinear and relativistic regime. The evolution of the laser beams is governed by two nonlinear Schrödinger equations that are coupled with the slow plasma density response. A nonlinear dispersion relation is derived and used to study the growth rates of the Raman forward and backward scattering instabilities as well of the Brillouin and self-focusing/modulational instabilities. The nonlinear evolution of the instabilities is investigated by means of direct simulations of the time-dependent system of nonlinear equations.
  • Moslem, WM, et al. (författare)
  • Solitary and blow-up electrostatic excitations in rotating magnetized electron-positron-ion plasmas
  • 2009
  • Ingår i: New Journal of Physics. - Institute of Physics Publishing (IOPP). - 1367-2630. ; 11
  • Tidskriftsartikel (refereegranskat)abstract
    • The nonlinear dynamics of a rotating magnetoplasma consisting of electrons, positrons and stationary positive ions is considered. The basic set of hydrodynamic and Poisson equations are reduced to a Zakharov-Kuznetsov (ZK) equation for the electric potential. The ZK equation is solved by applying an improved modified extended tanh-function method (2008 Phys. Lett. A 372 5691) and its characteristics are investigated. A set of new solutions are derived, including localized solitary waves, periodic nonlinear waveforms and divergent (explosive) pulses. The characteristics of these nonlinear excitations are investigated in detail.
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  • Resultat 1-8 av 8
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