Energetics of Multiple-Ion Species Hohlraum Plasmas

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A study of the laser-plasma interaction processes in multiple-ion species plasmas has been performed in plasmas that are created to emulate the plasma conditions in indirect drive inertial confinement fusion targets. Gas-filled hohlraums with densities of xe22/cc are heated to Te=3keV and backscattered laser light is measured by a suite of absolutely calibrated backscatter diagnostics. Ion Landau damping is increased by adding hydrogen to the CO2/CF4 gas fill. We find that the backscatter from stimulated Brillouin scattering is reduced is monotonically reduced with increasing damping, demonstrating that Landau damping is the controlling damping mechanism in ICF relevant high-electron temperature plasmas. ... continued below

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Neumayer, P; Berger, R; Callahan, D; Divol, L; Froula, D; London, R et al. November 5, 2007.

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A study of the laser-plasma interaction processes in multiple-ion species plasmas has been performed in plasmas that are created to emulate the plasma conditions in indirect drive inertial confinement fusion targets. Gas-filled hohlraums with densities of xe22/cc are heated to Te=3keV and backscattered laser light is measured by a suite of absolutely calibrated backscatter diagnostics. Ion Landau damping is increased by adding hydrogen to the CO2/CF4 gas fill. We find that the backscatter from stimulated Brillouin scattering is reduced is monotonically reduced with increasing damping, demonstrating that Landau damping is the controlling damping mechanism in ICF relevant high-electron temperature plasmas. The reduction in backscatter is accompanied by a comparable increase in both transmission of a probe beam and an increased hohlraum radiation temperature, showing that multiple-ion species plasmas improve the overall hohlraum energetics/performance. Comparison of the experimental data to linear gain calculations as well as detailed full-scale 3D laser-plasma interaction simulations show quantitative agreement. Our findings confirm the importance of Landau damping in controlling backscatter from high-electron temperature hohlraum plasmas and have lead to the inclusion of multi-ion species plasmas in the hohlraum point design for upcoming ignition campaigns at the National Ignition Facility.

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PDF-file: 18 pages; size: 0.5 Mbytes

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  • Presented at: American Physical Society, Orlando, FL, United States, Nov 12 - Nov 16, 2007

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  • Report No.: UCRL-CONF-236317
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 923622
  • Archival Resource Key: ark:/67531/metadc898054

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  • November 5, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 23, 2016, 6:19 p.m.

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Neumayer, P; Berger, R; Callahan, D; Divol, L; Froula, D; London, R et al. Energetics of Multiple-Ion Species Hohlraum Plasmas, article, November 5, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc898054/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.