Designing of Multi-Interface Diverging Experiments to Model Rayleigh-Taylor Growth in Supernovae

Details Designing of Multi-Interface Diverging Experiments to Model Rayleigh-Taylor Growth in Supernovae Designing of Multi-Interface Diverging Experiments to Model Rayleigh-Taylor Growth in Supernovae

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.0343g&link_type=abstract

American Astronomical Society, AAS Meeting #212, #3.43; Bulletin of the American Astronomical Society, Vol. 40, p.192

Astronomy and Astrophysics

Astronomy

Scientific paper

In previous experiments on the Omega Laser, researchers studying blast-wave-driven instabilities have observed the growth of Rayleigh-Taylor instabilities under conditions scaled to the He/H interface of SN1987A. Most of these experiments have been planar experiments, as the energy available proved unable to accelerate enough mass in a diverging geometry. With the advent of the NIF laser, which can deliver hundreds of kJ to an experiment, it is possible to produce 3D, blast-wave-driven, multiple-interface explosions and to study the mixing that develops. We report scaling simulations to model the interface dynamics of a multilayered, diverging Rayleigh-Taylor experiment for NIF using CALE, a hybrid adaptive Lagrangian-Eulerian code developed at LLNL. Specifically, we looked both qualitatively and quantitatively at the Rayleigh-Taylor growth and multi-interface interactions in mass-scaled, spherically divergent systems using different materials. The simulations will assist in the target design process and help choose diagnostics to maximize the information we receive in a particular shot. Simulations are critical for experimental planning, especially for experiments on large-scale facilities.
*This research was sponsored by LLNL through contract LLNL B56128 and by the NNSA through DOE Research Grant DE-FG52-04NA00064.

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