Application and validation of direct numerical simulation for ICF implosion stability analysis

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We have recently been applying a powerful computational tool, direct numerical simulation (DNS), to evaluate the stability of imploding inertial confinement fusion (ICF) capsules designed for the National Ignition Facility. In DNS, we explicitly calculate the evolution of realistic surface perturbations far into their nonlinear regimes, using a 2D Lagrangian radiation-hydrodynamics code. Because the mesh may become greatly distorted during the calculation, requiring frequent application of an automatic rezoner, and because we use a 2D code to represent 3D perturbations whose nonlinear behavior is shape- dependent, we have been seeking to assess the accuracy of DNS in as many regimes ... continued below

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5 p.

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Hoffman, N.M.; Swenson, F.J. & Varnum, W.S. July 1, 1996.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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We have recently been applying a powerful computational tool, direct numerical simulation (DNS), to evaluate the stability of imploding inertial confinement fusion (ICF) capsules designed for the National Ignition Facility. In DNS, we explicitly calculate the evolution of realistic surface perturbations far into their nonlinear regimes, using a 2D Lagrangian radiation-hydrodynamics code. Because the mesh may become greatly distorted during the calculation, requiring frequent application of an automatic rezoner, and because we use a 2D code to represent 3D perturbations whose nonlinear behavior is shape- dependent, we have been seeking to assess the accuracy of DNS in as many regimes as possible. For this purpose, we have conducted experimental campaigns to observe the instability of radiatively driven imploding cylinders, deuterated-shell spherical capsules, and radiatively accelerated flat foils perturbed on the unheated surface (``feedout`` experiments). We have compared DNS calculations to data from these experiments, and to theoretical predictions for incompressible Rayleigh-Taylor instability, with satisfactory agreement. Thus we are gradually accumulating confidence in the validity of DNS as applied to ICF.

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5 p.

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INIS; OSTI as DE96011610

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  • 24. European conference on laser interaction with matter, Madrid (Spain), 3-7 Jun 1996

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  • Other: DE96011610
  • Report No.: LA-UR--96-1865
  • Report No.: CONF-9606229--3
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 254083
  • Archival Resource Key: ark:/67531/metadc671677

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

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  • July 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • April 13, 2016, 12:54 p.m.

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Hoffman, N.M.; Swenson, F.J. & Varnum, W.S. Application and validation of direct numerical simulation for ICF implosion stability analysis, article, July 1, 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc671677/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.