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Three-dimensional design simulations of a high energy density re-shock experiment at the National Ignition Facility

[+] Author and Article Information
Ping Wang

Lawrence Livermore National Laboratory
wang32@llnl.gov

Kumar Raman

Lawrence Livermore National Laboratory
raman5@llnl.gov

Stephan A. MacLaren

Lawrence Livermore National Laboratory
maclaren2@llnl.gov

Channing M. Huntington

Lawrence Livermore National Laboratory
huntington4@llnl.gov

Sabrina R. Nagel

Lawrence Livermore National Laboratory
nagel7@llnl.gov

Kirk A Flippo

Los Alamos National Laboratory
kflippo@lanl.gov

Shon T Prisbrey

Lawrence Livermore National Laboratory
prisbrey1@llnl.gov

1Corresponding author.

ASME doi:10.1115/1.4038532 History: Received December 09, 2016; Revised September 28, 2017

Abstract

We present simulations of a new experimental platform at the National Ignition Facility for studying the hydrodynamic instability growth of a high energy density fluid interface that undergoes multiple shocks, i.e. is "re-shocked". In these experiments, indirect-drive laser cavities drive strong shocks through an initially solid, planar interface between a high-density plastic and low-density foam, in either one or both directions. The first shock turns the system into an unstable fluid interface with the pre-machined initial condition that then grows via the Richtmyer-Meshkov and Rayleigh-Taylor instabilities. Backlit x-ray imaging is used to visualize the instability growth at different times. Our main result is that this new high energy density re-shock platform is established, and that the initial data confirm the experiment operates in a hydrodynamic regime similar to what simulations predict. The simulations also reveal new types of edge effects that can disturb the experiment at late times and suggest ways to mitigate them.

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