Particle based studies in support of high-power laser experiments to study metal ejecta interactions

ORAL

Abstract

Shock-driven material can emit a fine spray of ejecta from its free surface. Understanding the dynamic and interaction of the metal ejecta is important to areas of study as diverse as industrial safety, astrophysics, spacecraft shielding, and inertial confinement fusion.
We present results from particle-based dynamics at atomistic as well as macro-scale simulation studies of the ejecta formation in the presence of grooves at the free surface as a result of a shock wave created at the ablator-metal interface. At the atomistic level, we use large scale simulations, 109 atoms, to extract values of pressure breakout and release, as well as ejecta mass and velocity density. The fractality of the ejecta ligaments is also being investigated.
At the macro-scale, we use Smooth Particle Hydrodynamics for the same conditions. This provides valuable information to the experimental campaign on the OMEGA and OMEGA-EP lasers platforms for studying the ejecta formation.

*LLNL-ABS-795429. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. Lawrence Livermore National Security, LLC.

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Presenters

  • Tomorr Haxhimali

    • Lawrence Livermore Natl Lab

Authors

  • Tomorr Haxhimali

    • Lawrence Livermore Natl Lab

  • Marco J Echeverria

    • University of Connecticut

  • Kyle Mackay

    • Lawrence Livermore Natl Lab

  • Suzanne J Ali

    • Lawrence Livermore Natl Lab
    • Shock Physics Group, Lawrence Livermore National Laboratory
    • Lawrence Livermore National Laboratory

  • Jon Henry Eggert

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Lab

  • Brandon E Morgan

    • Lawrence Livermore Natl Lab

  • Fady Michel Najjar

    • Lawrence Livermore Natl Lab

  • Hye-Sook Park

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Yuan Ping

    • Lawrence Livermore Natl Lab

  • Camelia V Stan

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Alison Saunders

    • Lawrence Livermore Natl Lab