Modeling and experiments of x-ray ablation of National Ignition Facility first wall materials

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This paper discusses results of modeling and experiments on the x-ray response of selected materials relevant to NIF target chamber design. X-ray energy deposition occurs in such small characteristic depths (on the order of a micron) that thermal conduction and hydrodynamic motion significantly affect the material response, even during the typical 10-ns pulses. The finite-difference ablation model integrates four separate processes: x-ray energy deposition, heat conduction, hydrodynamics, and surface vaporization. Experiments have been conducted at the Nova laser facility in Livermore on response of various materials to NIF-relevant x-ray fluences. Fused silica, Si nitride, B carbide, B, Si carbide, C, ... continued below

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9 p.

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Anderson, A.T.; Burnham, A.K.; Tobin, M.T. & Peterson, P.F. June 4, 1996.

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Description

This paper discusses results of modeling and experiments on the x-ray response of selected materials relevant to NIF target chamber design. X-ray energy deposition occurs in such small characteristic depths (on the order of a micron) that thermal conduction and hydrodynamic motion significantly affect the material response, even during the typical 10-ns pulses. The finite-difference ablation model integrates four separate processes: x-ray energy deposition, heat conduction, hydrodynamics, and surface vaporization. Experiments have been conducted at the Nova laser facility in Livermore on response of various materials to NIF-relevant x-ray fluences. Fused silica, Si nitride, B carbide, B, Si carbide, C, Al2O3, and Al were tested. Response was diagnosed using post-shot examinations of the surfaces with SEM and atomic force microscopes. Judgements were made about the dominant removal mechanisms for each material; relative importances of these processes were also studied with the x-ray response model.

Physical Description

9 p.

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INIS; OSTI as DE96013438

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  • Annual meeting of the American Nuclear Society (ANS), Reno, NV (United States), 16-20 Jun 1996

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  • Other: DE96013438
  • Report No.: UCRL-JC--123553
  • Report No.: CONF-9606116--76
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 372655
  • Archival Resource Key: ark:/67531/metadc676869

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  • June 4, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 17, 2016, 2:32 p.m.

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Anderson, A.T.; Burnham, A.K.; Tobin, M.T. & Peterson, P.F. Modeling and experiments of x-ray ablation of National Ignition Facility first wall materials, article, June 4, 1996; California. (digital.library.unt.edu/ark:/67531/metadc676869/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.