Shell asymmetry-driven hot-spot generation issues in high convergence ratio implosions on the National Ignition Facility

ORAL

Abstract

Much of the conceptual understanding, theory, and design of ICF implosions has been developed assuming a one-dimensional (1D) implosion [e.g. Lindl, J., Phys. Plasmas, \textbf{2}, 3933-4024 (1995); Betti, R., et al., 17, 058102 (2010)]. But what if the typical ICF implosion is not 1D? In this talk we present an overview of data and simulation results from recent high performance implosions on NIF that imply highly distorted implosions and an associated non-ideal hot-spot generation issue, \textit{even in cases where the bang-time emission (in x-rays and neutrons) from the implosion appears 1D.} We present a simple extension of a semi-analytic dynamic implosion model that captures the key effect of localized thin-regions in an implosions shell (fuel$+$remaining ablator), via a leaking hot-spot picture, and discuss what the model implies about the physics we can't directly diagnose in our suite of implosions.

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

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Authors

  • Omar Hurricane

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

  • Paul Springer

    • Lawrence Livermore National Laboratory

  • Debbie Callahan

    • Lawrence Livermore National Laboratory

  • Daniel Casey

    • Lawrence Livermore National Laboratory

  • Eduard Dewald

    • Lawrence Livermore National Laboratory

  • Thomas Dittrich

    • Lawrence Livermore National Laboratory

  • Tilo Doeppner

    • Lawrence Livermore National Laboratory

  • Denise Hinkel

    • Lawrence Livermore National Laboratory

  • Laura Berzak Hopkins

    • Lawrence Livermore National Laboratory

  • Andrea Kritcher

    • Lawrence Livermore National Laboratory

  • Tammy Ma

    • Lawrence Livermore National Laboratory

  • Andrew MacPhee

    • Lawrence Livermore National Laboratory

  • Jose Milovich

    • Lawrence Livermore National Laboratory

  • Hye-sook Park

    • Lawrence Livermore National Laboratory

  • Prav Patel

    • Lawrence Livermore National Laboratory

  • Joseph Ralph

    • Lawrence Livermore National Laboratory

  • Harry Robey

    • Lawrence Livermore National Laboratory

  • J. Steven Ross

    • Lawrence Livermore National Laboratory

  • Jay Salmonson

    • Lawrence Livermore National Laboratory

  • Brian Spears

    • Lawrence Livermore National Laboratory

  • Vladimir Smalyuk

    • Lawrence Livermore National Laboratory

  • Riccardo Tommasini

    • Lawrence Livermore National Laboratory

  • Charles Yeamans

    • Lawrence Livermore National Laboratory