Stimulated-Raman-scatter behavior in a relativistically hot plasma slab and an electromagnetic low-order pseudocavity

Abstract : Particle simulations on a flat-topped somewhat underdense typically n 0 / n c = 0.6 plasma slab by Nikolic et al. Phys. Rev. E 66, 036404 2002 were seen to give transient stimulated scattering behavior with frequency shift 0 − s p considerably less than the plasma frequency p. This has been linked to the electron acoustic wave EAW and the scattering was thus seen as another example of stimulated electron acoustic scattering inferred by Montgomery et al. Phys. Rev. Lett. 87, 155001 2001 from experiments on low-density plasmas. Montgomery et al. had noted the difficulty of how one could have a very narrow observed scattering from a wave whose damping was at least initially very high. Our Vlasov-Maxwell simulations for such somewhat underdense n 0 / n c 0.25 plasmas show that the simulation resonance was in fact determined by the beating of the pump with a new " radiating pseudocavity " electromagnetic mode for the slab at a frequency close to p with relatively low loss. This allows the initial narrow-band excitation of the kinetic electrostatic electron nonlinear KEEN waves the nonlinear " cousins " of EAWs at a well-defined frequency K 0 − p p which is not necessarily the value given by the EAW dispersion relation. The KEEN wave characteristics have been discussed by Afeyan et al. 33rd AAAC 2003, #238, IFSA 2003. The consideration of such a mechanism is relevant to moderately underdense hot plasmas.
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A. Ghizzo, T. W. Johnston, T. Réveillé, P. Bertrand, M. Albrecht-Marc. Stimulated-Raman-scatter behavior in a relativistically hot plasma slab and an electromagnetic low-order pseudocavity. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2006, 74 (4), pp.046407. ⟨10.1103/PhysRevE.74.046407⟩. ⟨hal-01791840⟩

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