Simulations of laser imprint for Nova experiments and for ignition capsules Metadata

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Title

  • Main Title Simulations of laser imprint for Nova experiments and for ignition capsules

Creator

  • Author: Weber, S.V.
    Creator Type: Personal
  • Author: Glendinning, S.G.
    Creator Type: Personal
  • Author: Kalantar, D.H.
    Creator Type: Personal
  • Author: Key, M.H.
    Creator Type: Personal
  • Author: Remington, B.A.
    Creator Type: Personal
  • Author: Rothenberg, J.E.
    Creator Type: Personal
  • Author: Wolfrum, E.
    Creator Type: Personal
  • Author: Verdon, C.P.
    Creator Type: Personal
  • Author: Knauer, J.P.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE, Washington, DC (United States)

Publisher

  • Name: Lawrence Livermore National Laboratory
    Place of Publication: California
    Additional Info: Lawrence Livermore National Lab., CA (United States)

Date

  • Creation: 1996-11-08

Language

  • English

Description

  • Content Description: In direct drive ICF, nonuniformities in laser illumination seed ripples at the ablation front in a process called imprint. These non nonuniformities grow during the capsule implosion and, if initially large enough, can penetrate the capsule shell, impede ignition, or degrade burn. Imprint has been simulated for recent experiments performed on the Nova laser at LLNL examining a variety of beam smoothing conditions. Most used laser intensities similar to the early part of an ignition capsule pulse shape, I=10X13 W/cm3. The simulations matched most of the measurements of imprint modulation. The effect of imprint upon National Ignition Facility (NIF) direct drive ignition capsules has also been simulated. Imprint is predicted to give modulation comparable to an intrinsic surface finish of 10 nm RMS. Modulation growth was examined using the Haan model, with linear growth as a function of spherical harmonic mode number obtained from an analytic dispersion relation. Ablation front amplitudes are predicted to become substantially nonlinear, so that saturation corrections are large. Direct numerical simulations of two- dimensional multimode growth were also performed. The capsule shell is predicted to remain intact, which gives a basis for believing that ignition can be achieved.
  • Physical Description: 31 p.; Other: FDE: PDF; PL:

Subject

  • Keyword: Laser Targets
  • Keyword: Nova Facility
  • STI Subject Categories: 70 Plasma Physics And Fusion
  • Keyword: Mathematical Models
  • Keyword: Laser Implosions
  • Keyword: Laser Cavities
  • Keyword: Inertial Fusion Drivers

Source

  • Conference: Meeting of the Division of Plasma Physics of the American Physical Society, Denver, CO (United States), 11-15 Nov 1996

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Other: DE98050763
  • Report No.: UCRL-JC--124547
  • Report No.: CONF-961102--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 641027
  • Archival Resource Key: ark:/67531/metadc692918

Note

  • Display Note: OSTI as DE98050763