Long Duration Backlighter Experiments at Omega

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We have successfully demonstrated a 7.5 ns-duration pinhole-apertured backlighter at the Omega laser facility. Pinhole-apertured point-projection backlighting for 8 ns will be useful for imaging evolving features in experiments at the National Ignition Facility. The backlighter consisted of a 20 {micro}m diameter pinhole in a 75 {micro}m thick Ta substrate separated from a Zn emitter (9 keV) by a 400 {micro}m thick high-density carbon piece. The carbon prevented the shock from the laser-driven surface from reaching the substrate before 8 ns and helped minimize x-ray ablation of the pinhole substrate. Grid wires in x-ray framing camera images of a gold ... continued below

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Reighard, A; Glendinning, S; Young, P; Hsing, W; Foord, M; Schneider, M et al. May 1, 2008.

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We have successfully demonstrated a 7.5 ns-duration pinhole-apertured backlighter at the Omega laser facility. Pinhole-apertured point-projection backlighting for 8 ns will be useful for imaging evolving features in experiments at the National Ignition Facility. The backlighter consisted of a 20 {micro}m diameter pinhole in a 75 {micro}m thick Ta substrate separated from a Zn emitter (9 keV) by a 400 {micro}m thick high-density carbon piece. The carbon prevented the shock from the laser-driven surface from reaching the substrate before 8 ns and helped minimize x-ray ablation of the pinhole substrate. Grid wires in x-ray framing camera images of a gold grid have a source-limited resolution significantly smaller than the pinhole diameter due to the high aspect ratio of the pinhole, but do not become much smaller at late times.

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PDF-file: 5 pages; size: 0.6 Mbytes

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  • Presented at: High Temperature Plasma Diagnostics, Albuquerque, NM, United States, May 11 - May 15, 2008

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  • Report No.: LLNL-CONF-403684
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 938481
  • Archival Resource Key: ark:/67531/metadc898542

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 9, 2016, 6:34 p.m.

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Reighard, A; Glendinning, S; Young, P; Hsing, W; Foord, M; Schneider, M et al. Long Duration Backlighter Experiments at Omega, article, May 1, 2008; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc898542/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.