Breakdown of Electrostatic Predictions for the Nonlinear Dispersion Relation of a Stimulated Raman Scattering-Driven Plasma Wave

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The kinetic nonlinear dispersion relation, and frequency shift {delta}{omega}{sub srs}, of a plasma wave driven by stimulated Raman scattering (SRS) 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 k{lambda}{sub D} {approx}> 0.35 (k being the plasma wave number and {lambda}{sub D} the Debye length), {delta}{omega}{sub srs} is significantly larger than could be inferred by assuming that the wave is freely propagating. Our theory is in excellent agreement with 1-D Eulerian Vlasov-Maxwell simulations when 0.3 {le} k{lambda}{sub D} {le} ... continued below

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12 p. (0.2 MB)

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Benisti, D; Strozzi, D J & Gremillet, L May 8, 2007.

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The kinetic nonlinear dispersion relation, and frequency shift {delta}{omega}{sub srs}, of a plasma wave driven by stimulated Raman scattering (SRS) 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 k{lambda}{sub D} {approx}> 0.35 (k being the plasma wave number and {lambda}{sub D} the Debye length), {delta}{omega}{sub srs} is significantly larger than could be inferred by assuming that the wave is freely propagating. Our theory is in excellent agreement with 1-D Eulerian Vlasov-Maxwell simulations when 0.3 {le} k{lambda}{sub D} {le} 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.

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12 p. (0.2 MB)

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PDF-file: 12 pages; size: 0.2 Mbytes

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  • Journal Name: Physics of Plasmas, vol. 15, n/a, March 17, 2008, pp. 030701; Journal Volume: 15

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  • Report No.: UCRL-JRNL-230843
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 926021
  • Archival Resource Key: ark:/67531/metadc895523

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  • May 8, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • April 13, 2017, 3:59 p.m.

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Benisti, D; Strozzi, D J & Gremillet, L. Breakdown of Electrostatic Predictions for the Nonlinear Dispersion Relation of a Stimulated Raman Scattering-Driven Plasma Wave, article, May 8, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc895523/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.