NIF Target Capsule Wall And Hohlraum Transfer Gas Effects On Deuterium-Tritium Redistribution Rates

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The effects of temperature and age on the times required for beta-heating-induced redistribution of a 50-50 mole percent mixture of deuterium and tritium (DT) in a spherical capsule are investigated analytically and numerically. The derivation of an analytical solution for the redistribution time in a one-dimensional binary diffusion model, which includes the capsule thermal resistance, is first described. This result shows that the redistribution time for a high conductivity capsule wall is approximately doubled after 8 days of {sup 3}He formation. In contrast, with a low thermal conductivity capsule wall (e.g., polyimide), the redistribution time would increase by less than ... continued below

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Giedt, W. H. & Sanchez, J. J. June 27, 2005.

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The effects of temperature and age on the times required for beta-heating-induced redistribution of a 50-50 mole percent mixture of deuterium and tritium (DT) in a spherical capsule are investigated analytically and numerically. The derivation of an analytical solution for the redistribution time in a one-dimensional binary diffusion model, which includes the capsule thermal resistance, is first described. This result shows that the redistribution time for a high conductivity capsule wall is approximately doubled after 8 days of {sup 3}He formation. In contrast, with a low thermal conductivity capsule wall (e.g., polyimide), the redistribution time would increase by less than 10%. The substantial effect of the capsule wall resistance suggested that the resistance to heat transfer from the capsule through the surrounding transfer gas to the hohlraum wall would also influence the redistribution process. This was investigated with a spherical model, which was based on accounting for energy transfer by diffusion with a conduction heat transfer approximation. This made it possible to solve for the continuous temperature distribution throughout the capsule and surrounding gas. As with the capsule the redistribution times depended on the relative values of the thermal resistances of the vapor, the capsule, and the transfer gas. With increasing thermal resistance of the vapor (increased concentration of {sup 3}He) redistributions times for hydrocarbon capsules were significantly less than predicted by the one-dimensional model, which included the capsule wall resistance. In particular for low {sup 3}He concentrations the time constant was approximately 10% less than the minimum one-dimensional value of 27 minutes. Further analytical and experimental investigation focused on defining the relations between the thermal resistances under which the one-dimensional model analysis applies is recommended.

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PDF-file: 28 pages; size: 0.3 Mbytes

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  • Journal Name: Fusion Science And Technology, vol. 49, No. 4, May 10, 2006, pp. 588-599

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  • Report No.: UCRL-JRNL-213785
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 894347
  • Archival Resource Key: ark:/67531/metadc882875

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  • June 27, 2005

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  • Sept. 22, 2016, 2:13 a.m.

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  • Oct. 4, 2016, 5:46 p.m.

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Giedt, W. H. & Sanchez, J. J. NIF Target Capsule Wall And Hohlraum Transfer Gas Effects On Deuterium-Tritium Redistribution Rates, article, June 27, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc882875/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.