High resolution 17 keV to 75 keV backlighters for High Energy Density experiments

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We have developed 17 keV to 75 keV 1-dimensional and 2-dimensional high-resolution (< 10 {micro}m) radiography using high-intensity short pulse lasers. High energy K-{alpha} sources are created by fluorescence from hot electrons interacting in the target material after irradiation by lasers with intensity I{sub L} > 10{sup 17} W/cm{sup 2}. We have achieved high resolution point projection 1-dimensional and 2-dimensional radiography using micro-foil and micro-wire targets attached to low-Z substrate materials. The micro-wire size was 10 {micro}m x 10 {micro}m x 300 {micro}m on a 300 {micro}m x 300 {micro}m x 5 {micro}m CH substrate. The radiography performance was demonstrated ... continued below

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Park, H; Maddox, B R; Giraldez, E; Hatchett, S P; Hudson, L; Izumi, N et al. February 25, 2008.

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We have developed 17 keV to 75 keV 1-dimensional and 2-dimensional high-resolution (< 10 {micro}m) radiography using high-intensity short pulse lasers. High energy K-{alpha} sources are created by fluorescence from hot electrons interacting in the target material after irradiation by lasers with intensity I{sub L} > 10{sup 17} W/cm{sup 2}. We have achieved high resolution point projection 1-dimensional and 2-dimensional radiography using micro-foil and micro-wire targets attached to low-Z substrate materials. The micro-wire size was 10 {micro}m x 10 {micro}m x 300 {micro}m on a 300 {micro}m x 300 {micro}m x 5 {micro}m CH substrate. The radiography performance was demonstrated using the Titan laser at LLNL. We observed that the resolution is dominated by the micro-wire target size and there is very little degradation from the plasma plume, implying that the high energy x-ray photons are generated mostly within the micro-wire volume. We also observe that there are enough K{alpha} photons created with a 300 J, 1-{omega}, 40 ps pulse laser from these small volume targets, and that the signal-to-noise ratio is sufficiently high, for single shot radiography experiments. This unique technique will be used on future high energy density (HED) experiments at the new Omega-EP, ZR and NIF facilities.

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PDF-file: 29 pages; size: 0.8 Mbytes

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  • Journal Name: Physics of Plasmas Journal, vol. 15, N/A, July 23, 2008, pp. 072705; Journal Volume: 15

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  • Report No.: LLNL-JRNL-403480
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 944338
  • Archival Resource Key: ark:/67531/metadc899322

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  • February 25, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 29, 2016, 12:37 p.m.

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Park, H; Maddox, B R; Giraldez, E; Hatchett, S P; Hudson, L; Izumi, N et al. High resolution 17 keV to 75 keV backlighters for High Energy Density experiments, article, February 25, 2008; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc899322/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.