Rayleigh–Taylor instabilities in high-energy density settings on the National Ignition Facility
| Autor: | Bruce A. Remington, Hye-Sook Park, Daniel T. Casey, Robert M. Cavallo, Daniel S. Clark, Channing M. Huntington, Dan H. Kalantar, Carolyn C. Kuranz, Aaron R. Miles, Sabrina R. Nagel, Kumar S. Raman, Christoper E. Wehrenberg, Vladimir A. Smalyuk |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
National Ignition Facility Multidisciplinary Rayleigh–Taylor instability Plasma 01 natural sciences Instability 010305 fluids & plasmas Nuclear physics Applied Physical Sciences Supernova symbols.namesake Physical Sciences 0103 physical sciences high-energy density experiments symbols Radiative transfer Interfaces and Mixing: Nonequilibrium Transport Across the Scales Special Feature Rayleigh scattering 010306 general physics Inertial confinement fusion Research Articles |
| Zdroj: | Proceedings of the National Academy of Sciences of the United States of America |
| ISSN: | 1091-6490 0027-8424 |
| Popis: | Significance We present research results on the Rayleigh–Taylor (RT) instability at an unstable interface under high-energy density conditions using the National Ignition Facility at Lawrence Livermore National Laboratory. We can reach pressures in the 100-TPa regime on the Hugoniot, or ∼500-GPa regime along a quasi-isentrope, allowing the sample under study to remain solid, at planetary interior pressures. We observe RT stabilization (i) at an ablation front; (ii) in the presence of a strongly radiative shock; and (iii) in a unique regime of quasi-isentropic, high pressure, solid-state material flow, where the material strength significantly affects the evolution of a hydrodynamically unstable interface. The Rayleigh–Taylor (RT) instability occurs at an interface between two fluids of differing density during an acceleration. These instabilities can occur in very diverse settings, from inertial confinement fusion (ICF) implosions over spatial scales of ∼10−3−10−1 cm (10–1,000 μm) to supernova explosions at spatial scales of ∼1012 cm and larger. We describe experiments and techniques for reducing (“stabilizing”) RT growth in high-energy density (HED) settings on the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory. Three unique regimes of stabilization are described: (i) at an ablation front, (ii) behind a radiative shock, and (iii) due to material strength. For comparison, we also show results from nonstabilized “classical” RT instability evolution in HED regimes on the NIF. Examples from experiments on the NIF in each regime are given. These phenomena also occur in several astrophysical scenarios and planetary science [Drake R (2005) Plasma Phys Controlled Fusion 47:B419–B440; Dahl TW, Stevenson DJ (2010) Earth Planet Sci Lett 295:177–186]. |
| Databáze: | OpenAIRE |
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