We present 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.
Three-Dimensional Design Simulations of a High-Energy Density Reshock Experiment at the National Ignition Facility
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received December 9, 2016; final manuscript received September 28, 2017; published online December 21, 2017. Assoc. Editor: Daniel Maynes. The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States Government purposes.
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Wang, P., Raman, K. S., MacLaren, S. A., Huntington, C. M., Nagel, S. R., Flippo, K. A., and Prisbrey, S. T. (December 21, 2017). "Three-Dimensional Design Simulations of a High-Energy Density Reshock Experiment at the National Ignition Facility." ASME. J. Fluids Eng. April 2018; 140(4): 041207. https://doi.org/10.1115/1.4038532
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