Impact of fill tube perturbation on implosion experiments conducted with high density carbon ablators

ORAL

Abstract

At stagnation, all implosion experiments conducted with a high density carbon (HDC) ablator exhibit signatures of fill tube induced mix. This perturbation could potentially be a significant cause of performance degradation. This talk will discuss the impact that the fill tube perturbation has on state of the reacting plasma and on integrated performance. The changes in the observed fill tube perturbation size, temperature and radiative loss as well as the overall integrated performance between experiments where the initial fill tube diameter was varied will be examined. Additionally, the observed fill tube dynamics and implosion performance will be compared to detailed radiation hydrodynamic calculations that include a fill tube perturbation. Using radiation hydrodynamic simulations, the relative impact on performance from enhanced radiative losses, conduction losses, heat capacity, and shell rho r nonuniformity that arise from the fill tube perturbation will be discussed.

*This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.

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Presenters

  • Arthur E. Pak

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

Authors

  • Arthur E. Pak

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • C. R. Weber

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

  • Laurent Divol

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Laura Robin Benedetti

    • Lawrence Livermore Natl Lab

  • Laura F. Berzak Hopkins

    • Lawrence Livermore Natl Lab

  • Daniel S. Clark

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Eduard L. Dewald

    • Lawrence Livermore Natl Lab

  • David Neal Fittinghoff

    • Lawrence Livermore Natl Lab

  • Otto L Landen

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Sebastien Le Pape

    • Lawrence Livermore Natl Lab

  • Tammy Yee Wing Ma

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

  • Edward V Marley

    • Lawrence Livermore Natl Lab

  • Sabrina R Nagel

    • Lawrence Livermore Natl Lab

  • Louisa A Pickworth

    • Lawrence Livermore Natl Lab

  • Petr L Volegov

    • Los Alamos National Laboratory

  • David K. Bradley

    • Lawrence Livermore Natl Lab

  • Debra Ann Callahan

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab
    • LLNL

  • Gary P Grim

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Omar A Hurricane

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

  • Pravesh K Patel

    • Lawrence Livermore Natl Lab

  • Marilyn Beth Schneider

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Lab
    • Lawrence Livermore National Laboratory

  • Michael J Edwards

    • Lawrence Livermore Natl Lab