On the Transition from Thermally-driven to Ponderomotively-driven Stimulated Brillouin Scattering and Filamentation of Light in Plasma

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The dispersion properties of ion acoustic waves and their nonlinear coupling to light waves through ponderomotive and thermal forces are sensitive to the strength of electron-ion collisions. Here, we consider the growth rate of stimulated Brillouin scattering (SBS) when the driven acoustic wave frequency and wavelength span the range of small to large compared to electron-ion collision frequency and mean free path respectively. We find in all cases the thermal contributions to the SBS growth rate are insignificant if the ion acoustic wave frequency is greater than the electron-ion collision frequency and the wavelength is much shorter than the electron-ion ... continued below

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Berger, R. L.; Valeo, E. J. & Brunner, S. April 4, 2005.

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The dispersion properties of ion acoustic waves and their nonlinear coupling to light waves through ponderomotive and thermal forces are sensitive to the strength of electron-ion collisions. Here, we consider the growth rate of stimulated Brillouin scattering (SBS) when the driven acoustic wave frequency and wavelength span the range of small to large compared to electron-ion collision frequency and mean free path respectively. We find in all cases the thermal contributions to the SBS growth rate are insignificant if the ion acoustic wave frequency is greater than the electron-ion collision frequency and the wavelength is much shorter than the electron-ion mean free path. On the other hand, the purely growing filamentation instability remains thermally driven for shorter wavelengths than SBS even when the growth rate is larger than the acoustic frequency.

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416 Kilobytes

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  • Report No.: PPPL-4061
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/838510 | External Link
  • Office of Scientific & Technical Information Report Number: 838510
  • Archival Resource Key: ark:/67531/metadc778919

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  • April 4, 2005

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  • Dec. 3, 2015, 9:30 a.m.

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  • Aug. 3, 2016, 4:12 p.m.

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Berger, R. L.; Valeo, E. J. & Brunner, S. On the Transition from Thermally-driven to Ponderomotively-driven Stimulated Brillouin Scattering and Filamentation of Light in Plasma, report, April 4, 2005; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc778919/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.