Measurement of the Shock Velocity and Symmetry History in Decaying Shock Pulses

ORAL

Abstract

Decaying first shock pulses are predicted in simulations to provide more stable implosions and still achieve a low adiabat in the fuel, enabling a higher fuel compression similar to ``low foot'' laser pulses. The first step in testing these predictions was to measure the shock velocity for both a three shock and a four shock adiabat-shaped pulse in a keyhole experimental platform. We present measurements of the shock velocity history, including the decaying shock velocity inside the ablator, and compare it with simulations, as well as with previous low and high foot pulses. Using the measured pulse shape, the predicted adiabat from simulations is presented and compared with the calculated adiabat from low and high foot laser pulse shapes. This work was performed under the auspices of the U.S. Department of Energy by LLNL under Contract DE-AC52-07NA27344.

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Authors

  • Kevin Baker

    LLNL, Lawrence Livermore National Laboratory

  • J.L. Milovich

    LLNL, Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • Oggie Jones

    LLNL, Lawrence Livermore National Laboratory, Lawrence Livermore National laboratory, Lawrence Livermore Natl Lab

  • H.F. Robey

    LLNL, Lawrence Livermore National Laboratory

  • Vladimir Smalyuk

    Lawrence Livermore National Laboratory, LLNL

  • D.T. Casey

    LLNL, Lawrence Livermore National Laboratory

  • Peter Celliers

    LLNL, Lawrence Livermore National Laboratory

  • Daniel Clark

    LLNL, Lawrence Livermore National Laboratory

  • Emilio Giraldez

    GA, General Atomics

  • S. Haan

    Lawrence Livermore National Laboratory, LLNL

  • Alex Hamza

    LLNL, Lawrence Livermore National Laboratory

  • L.F. Berzak Hopkins

    LLNL, Lawrence Livermore National Laboratory

  • Kenneth Jancaitis

    LLNL, Lawrence Livermore National Laboratory

  • Jeremy Kroll

    LLNL, Lawrence Livermore National Laboratory

  • Kai LaFortune

    LLNL, Lawrence Livermore National Laboratory

  • Brian MacGowan

    LLNL, Lawrence Livermore National Laboratory

  • A.G. MacPhee

    LLNL, Lawrence Livermore National Laboratory

  • John Moody

    LLNL, Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • Abbas Nikroo

    GA, General Atomics

  • J. Luc Peterson

    LLNL, Lawrence Livermore National Laboratory

  • Kumar Raman

    LLNL, Lawrence Livermore National Laboratory

  • Christopher Weber

    Lawrence Livermore National Laboratory, LLNL

  • Clifford Widmayer

    LLNL, Lawrence Livermore National Laboratory