Radiation Effects and High Energy Physics

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Improving predictive capability in REHEDS simulations with fast, accurate, and consistent nonequilibrium material properties

News Article, June 22, 2023 • Sandia scientist Stephanie Hansen was elected Fellow of the American Physical Society by its Division of Plasma Physics. (Photo by Randy Montoya) Predictive design of experiments in Radiation, Electrical, and High Energy Density Science (REHEDS) requires knowledge of material properties (e.g., equations of state (EOS), transport coefficients, and radiation physics). Interpreting...

Quantum-accurate multiscale modeling in highly compressed metals

News Article, June 22, 2023 • Lasers are used to align diagnostics and hardware prior to shooting on Sandia's Z machine, the world's most powerful and efficient laboratory radiation source. The development of equations-of-state and transport models in areas such as shock compression and fusion energy science is critical to DOE programs. Notable shortcomings in these...

Lasers are aligning diagnostics and hardware.

The study of Z-pinches with engineered defects

News Article, October 13, 2022 • 3D-magnetohydrodynamic simulations of electrothermal instability growth by studying Z-pinches with engineered defects Electrothermal instability (ETI) is driven by Joule heating and arises from the dependence of resistivity on temperature. When a metal is Joule-heated through the boiling point, ETI drives azimuthally correlated surface density variations or “strata,” which provide the dominant seed...