Analytic Expressions for Minimizing Hohlraum Wall Losses

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We apply our recent analytic solutions to the radiation diffusion equation to problems of interest for ICF hohlraums. The solutions provide quantitative values for absorbed energy, which are of use for generating a desired radiation temperature vs. time within the hohlraum. In particular we use analytic fits to the Rosseland mean opacity and to the specific heat of combinations of materials (''cocktails'') designed to maximize the former while minimizing the latter. By doing so we find good agreement with numerical simulations and with experimental results. In particular we find that the wall loss savings of cocktails vs. the standard gold ... continued below

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8 p. (0.3 MB)

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Rosen, M. D. May 31, 2006.

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We apply our recent analytic solutions to the radiation diffusion equation to problems of interest for ICF hohlraums. The solutions provide quantitative values for absorbed energy, which are of use for generating a desired radiation temperature vs. time within the hohlraum. In particular we use analytic fits to the Rosseland mean opacity and to the specific heat of combinations of materials (''cocktails'') designed to maximize the former while minimizing the latter. By doing so we find good agreement with numerical simulations and with experimental results. In particular we find that the wall loss savings of cocktails vs. the standard gold walled hohlraums have both pulse-length and temperature dependencies. Due to those dependencies we predict that NIF cocktail hohlraums will perform better than present day cocktail experiments. In addition, we apply our solutions to finding that density of foam hohlraum walls which minimizes wall loss by being of sufficiently low density to be supersonic, thus reducing kinetic energy losses, yet high enough density to not unduly suffer from enhanced specific heat capacity.

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8 p. (0.3 MB)

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PDF-file: 8 pages; size: 0.3 Mbytes

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  • Presented at: 29th European Conference on Laser Interaction with Matter, Madrid, Spain, Jun 11 - Jun 16, 2006

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  • Report No.: UCRL-CONF-221911
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 896293
  • Archival Resource Key: ark:/67531/metadc891106

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  • May 31, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • April 17, 2017, 1:33 p.m.

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Rosen, M. D. Analytic Expressions for Minimizing Hohlraum Wall Losses, article, May 31, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc891106/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.