Direct Measurements of an increased threshold for stimulated Brillouin scattering with polarization smoothing in ignition hohlraum plasmas

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We demonstrate a significant reduction of stimulated Brillouin scattering by polarization smoothing. The intensity threshold is measured to increase by a factor of 1.7 {+-} 0.2 when polarization smoothing is applied. The results were obtained in a high-temperature (T{sub 3} {approx_equal} 3 keV) hohlraum plasma where filamentation is negligible in determining the backscatter threshold. These results are explained by an analytical model relevant to ICF plasma conditions that modifies the linear gain exponent to account for polarization smoothing.

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6 p. (0.4 MB)

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Froula, D; Divol, L; Berger, R L; London, R; Meezan, N; Neumayer, P et al. November 8, 2007.

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We demonstrate a significant reduction of stimulated Brillouin scattering by polarization smoothing. The intensity threshold is measured to increase by a factor of 1.7 {+-} 0.2 when polarization smoothing is applied. The results were obtained in a high-temperature (T{sub 3} {approx_equal} 3 keV) hohlraum plasma where filamentation is negligible in determining the backscatter threshold. These results are explained by an analytical model relevant to ICF plasma conditions that modifies the linear gain exponent to account for polarization smoothing.

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6 p. (0.4 MB)

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PDF-file: 6 pages; size: 0.4 Mbytes

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  • Journal Name: Physics Review Letters, vol. 101, no. 115002, December 10, 2008, pp. 115002; Journal Volume: 101

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  • Report No.: UCRL-JRNL-236557
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 944302
  • Archival Resource Key: ark:/67531/metadc899659

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  • November 8, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • April 17, 2017, 12:19 p.m.

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Froula, D; Divol, L; Berger, R L; London, R; Meezan, N; Neumayer, P et al. Direct Measurements of an increased threshold for stimulated Brillouin scattering with polarization smoothing in ignition hohlraum plasmas, article, November 8, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc899659/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.