TITLE

Breakdown of electrostatic predictions for the nonlinear dispersion relation of a stimulated Raman scattering driven plasma wave

AUTHOR(S)
Bénisti, Didier; Strozzi, David J.; Gremillet, Laurent
PUB. DATE
March 2008
SOURCE
Physics of Plasmas;Mar2008, Vol. 15 Issue 3, p030701
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The kinetic nonlinear dispersion relation, and frequency shift δωsrs, of a plasma wave driven by stimulated Raman scattering are presented. Our theoretical calculations are fully electromagnetic, and use an adiabatic expression for the electron susceptibility which accounts for the change in phase velocity as the wave grows. When kλD>=0.35 (k being the plasma wave number and λD the Debye length), δωsrs is significantly larger than could be inferred by assuming that the wave is freely propagating. Our theory is in excellent agreement with 1D Eulerian Vlasov–Maxwell simulations when 0.3≤kλD≤0.58, and allows discussion of previously proposed mechanisms for Raman saturation. In particular, we find that no “loss of resonance” of the plasma wave would limit the Raman growth rate, and that saturation through a phase detuning between the plasma wave and the laser drive is mitigated by wave number shifts.
ACCESSION #
31520928

 

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