Saturation of the Two-Plasmon Decay Instability in Long-Scale-Length Plasmas Relevant to Direct-Drive Inertial Confinement Fusion

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Measurements of the hot-electron generation by the two-plasmon-decay instability are made in plasmas relevant to direct-drive inertial confinement fusion. Density-scale lengths of 400 {micro}m at n{sub cr}/4 in planar CH targets allowed the two-plasmon-decay instability to be driven to saturation for vacuum intensities above ~3.5 x 10{sup 14} W cm{sup -2}. In the saturated regime, ~1% of the laser energy is converted to hot electrons. The hot-electron temperature is measured to increase rapidly from 25 to 90 keV as the laser beam intensity is increased from 2 to 7 x 10{sup 14} W cm{sup -2}. This increase in the hot-electron ... continued below

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Yaakobi, B; Hu, S X; Chang, P -Y; Craxton, R S; Edgell, D H; Follett, R et al. April 20, 2012.

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Measurements of the hot-electron generation by the two-plasmon-decay instability are made in plasmas relevant to direct-drive inertial confinement fusion. Density-scale lengths of 400 {micro}m at n{sub cr}/4 in planar CH targets allowed the two-plasmon-decay instability to be driven to saturation for vacuum intensities above ~3.5 x 10{sup 14} W cm{sup -2}. In the saturated regime, ~1% of the laser energy is converted to hot electrons. The hot-electron temperature is measured to increase rapidly from 25 to 90 keV as the laser beam intensity is increased from 2 to 7 x 10{sup 14} W cm{sup -2}. This increase in the hot-electron temperature is compared with predictions from nonlinear Zakharov models.

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  • Journal Name: Physical Review Letters; Journal Volume: 108; Journal Issue: 16

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  • Report No.: DOE/NA/28302-1055
  • Grant Number: FC52-08NA28302
  • Office of Scientific & Technical Information Report Number: 1038743
  • Archival Resource Key: ark:/67531/metadc841177

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  • April 20, 2012

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 1, 2016, 6:29 p.m.

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Yaakobi, B; Hu, S X; Chang, P -Y; Craxton, R S; Edgell, D H; Follett, R et al. Saturation of the Two-Plasmon Decay Instability in Long-Scale-Length Plasmas Relevant to Direct-Drive Inertial Confinement Fusion, article, April 20, 2012; United States. (digital.library.unt.edu/ark:/67531/metadc841177/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.