Hard X-ray Imaging for Measuring Laser Absorption Spatial Profiles on the National Ignition Facility

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Hard x-ray (''Thin wall'') imaging will be employed on the National Ignition Facility (NIF) to spatially locate laser beam energy deposition regions on the hohlraum walls in indirect drive Inertial Confinement Fusion (ICF) experiments, relevant for ICF symmetry tuning. Based on time resolved imaging of the hard x-ray emission of the laser spots, this method will be used to infer hohlraum wall motion due to x-ray and laser ablation and any beam refraction caused by plasma density gradients. In optimizing this measurement, issues that have to be addressed are hard x-ray visibility during the entire ignition laser pulse with intensities ... continued below

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Dewald, E L; Jones, O S; Landen, O L; Suter, L; Amendt, P; Turner, R E et al. April 25, 2006.

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Hard x-ray (''Thin wall'') imaging will be employed on the National Ignition Facility (NIF) to spatially locate laser beam energy deposition regions on the hohlraum walls in indirect drive Inertial Confinement Fusion (ICF) experiments, relevant for ICF symmetry tuning. Based on time resolved imaging of the hard x-ray emission of the laser spots, this method will be used to infer hohlraum wall motion due to x-ray and laser ablation and any beam refraction caused by plasma density gradients. In optimizing this measurement, issues that have to be addressed are hard x-ray visibility during the entire ignition laser pulse with intensities ranging from 10{sup 13} to 10{sup 15} W/cm{sup 2}, as well as simultaneous visibility of the inner and the outer laser drive cones. In this work we will compare the hard x-ray emission calculated by LASNEX and analytical modeling with thin wall imaging data recorded previously on Omega and during the first hohlraum experiments on NIF. Based on these calculations and comparisons the thin wall imaging will be optimized for ICF/NIF experiments.

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PDF-file: 15 pages; size: 0.8 Mbytes

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  • Presented at: High Temperature Plasma Diagnostics, Williamsburg, VA, United States, May 07 - May 11, 2006

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  • Report No.: UCRL-CONF-221138
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 897970
  • Archival Resource Key: ark:/67531/metadc887138

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  • April 25, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 28, 2016, 7:38 p.m.

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Dewald, E L; Jones, O S; Landen, O L; Suter, L; Amendt, P; Turner, R E et al. Hard X-ray Imaging for Measuring Laser Absorption Spatial Profiles on the National Ignition Facility, article, April 25, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc887138/: accessed September 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.