Demonstartion of density dependence of x-ray flux in a laser-driven hohlraum

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Experiments have been conducted using laser-driven cylindrical hohlraums whose walls are machined from Ta{sub 2}O{sub 5} foams of 100 mg/cc and 4 g/cc densities. Measurements of the radiation temperature demonstrate that the lower density walls produce higher radiation temperatures than the high density walls. This is the first experimental demonstration of the prediction that this would occur [M. D. Rosen and J. H. Hammer, Phys. Rev. E 72, 056403 (2005)]. For high density walls, the radiation front propagates subsonically, and part of the absorbed energy is wasted by the flow kinetic energy. For the lower wall density, the front velocity ... continued below

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Young, P E; Rosen, M D; Hammer, J H; Hsing, W S; Glendinning, S G; Turner, R E et al. February 11, 2008.

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Experiments have been conducted using laser-driven cylindrical hohlraums whose walls are machined from Ta{sub 2}O{sub 5} foams of 100 mg/cc and 4 g/cc densities. Measurements of the radiation temperature demonstrate that the lower density walls produce higher radiation temperatures than the high density walls. This is the first experimental demonstration of the prediction that this would occur [M. D. Rosen and J. H. Hammer, Phys. Rev. E 72, 056403 (2005)]. For high density walls, the radiation front propagates subsonically, and part of the absorbed energy is wasted by the flow kinetic energy. For the lower wall density, the front velocity is supersonic and can devote almost all of the absorbed energy to heating the wall.

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PDF-file: 6 pages; size: 0.6 Mbytes

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  • Journal Name: Physical Review Letters, vol. 101, no. 0031-9007, July 14, 2008, pp. 035001-1-4; Journal Volume: 101

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  • Report No.: LLNL-JRNL-402851
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 944319
  • Archival Resource Key: ark:/67531/metadc898256

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  • February 11, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 23, 2016, 12:39 p.m.

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Young, P E; Rosen, M D; Hammer, J H; Hsing, W S; Glendinning, S G; Turner, R E et al. Demonstartion of density dependence of x-ray flux in a laser-driven hohlraum, article, February 11, 2008; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc898256/: accessed August 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.