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Title: Three-Dimensional Design Simulations of a High-Energy Density Reshock Experiment at the National Ignition Facility

Abstract

We present here simulations of a new experimental platform at the National Ignition Facility (NIF) for studying the hydrodynamic instability growth of a high-energy density (HED) fluid interface that undergoes multiple shocks, i.e., is “reshocked.” 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 premachined 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 HED reshock 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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1511231
Report Number(s):
LA-UR-18-22092
Journal ID: ISSN 0098-2202
Grant/Contract Number:  
AC52-06NA25396; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Fluids Engineering
Additional Journal Information:
Journal Volume: 140; Journal Issue: 4; Journal ID: ISSN 0098-2202
Publisher:
ASME
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; density; simulation; shock (mechanics); engineering simulation; design; modeling; ignition; lasers; shock tubes

Citation Formats

Wang, Ping, Raman, Kumar S., MacLaren, Stephan A., Huntington, Channing M., Nagel, Sabrina R., Flippo, Kirk A., and Prisbrey, Shon T. Three-Dimensional Design Simulations of a High-Energy Density Reshock Experiment at the National Ignition Facility. United States: N. p., 2017. Web. doi:10.1115/1.4038532.
Wang, Ping, Raman, Kumar S., MacLaren, Stephan A., Huntington, Channing M., Nagel, Sabrina R., Flippo, Kirk A., & Prisbrey, Shon T. Three-Dimensional Design Simulations of a High-Energy Density Reshock Experiment at the National Ignition Facility. United States. doi:10.1115/1.4038532.
Wang, Ping, Raman, Kumar S., MacLaren, Stephan A., Huntington, Channing M., Nagel, Sabrina R., Flippo, Kirk A., and Prisbrey, Shon T. Thu . "Three-Dimensional Design Simulations of a High-Energy Density Reshock Experiment at the National Ignition Facility". United States. doi:10.1115/1.4038532. https://www.osti.gov/servlets/purl/1511231.
@article{osti_1511231,
title = {Three-Dimensional Design Simulations of a High-Energy Density Reshock Experiment at the National Ignition Facility},
author = {Wang, Ping and Raman, Kumar S. and MacLaren, Stephan A. and Huntington, Channing M. and Nagel, Sabrina R. and Flippo, Kirk A. and Prisbrey, Shon T.},
abstractNote = {We present here simulations of a new experimental platform at the National Ignition Facility (NIF) for studying the hydrodynamic instability growth of a high-energy density (HED) fluid interface that undergoes multiple shocks, i.e., is “reshocked.” 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 premachined 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 HED reshock 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.},
doi = {10.1115/1.4038532},
journal = {Journal of Fluids Engineering},
number = 4,
volume = 140,
place = {United States},
year = {2017},
month = {12}
}

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