Marcus D. Knudson
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View article: Inelastic deformation of diamond single crystals shock compressed to multimegabar stresses: Wave profile calculations
Inelastic deformation of diamond single crystals shock compressed to multimegabar stresses: Wave profile calculations Open
As the archetypal strong solid, the response of diamond shock compressed to multimegabar stresses is important for fundamental science and for numerical simulations of wave profiles for applications in high energy density physics experimen…
View article: Roadmap for warm dense matter physics
Roadmap for warm dense matter physics Open
This roadmap presents the state-of-the-art, current challenges and near future developments anticipated in the thriving field of warm dense matter physics. Originating from strongly coupled plasma physics, high pressure physics and high en…
View article: Genetic algorithm-based geometry calibration for dynamic compression x-ray diffraction experiments
Genetic algorithm-based geometry calibration for dynamic compression x-ray diffraction experiments Open
An important component of dynamic compression x-ray diffraction (XRD) experiment analysis is geometry calibration: proper data interpretation requires knowledge of the precise detector position and orientation and, if the experiment involv…
View article: DENNIS: a design and analysis tool for dynamic material x-ray diffraction experiments
DENNIS: a design and analysis tool for dynamic material x-ray diffraction experiments Open
We present DENNIS (Diffraction Experiment desigN and aNalysiS): a graphical software tool useful for the design and analysis of dynamic x-ray diffraction experiments, such as those performed on the Z Pulsed Power Facility, Thor Pulsed Powe…
View article: Extreme compression of planetary gases: High-accuracy pressure-density measurements of hydrogen-helium mixtures above fourfold compression
Extreme compression of planetary gases: High-accuracy pressure-density measurements of hydrogen-helium mixtures above fourfold compression Open
Hydrogen (H2) and helium (He), the most abundant elements in the universe, pose a unique challenge in measuring the equation of state of the mixture, owing to their differing physical properties. There remains a need for data with high eno…
View article: Executive Summary of the Z Fundamental Science Program
Executive Summary of the Z Fundamental Science Program Open
The Z Fundamental Science (ZFS) Program is intended to provide access to the Z machine and its diagnostics for high energy density (HED) experiments in collaboration with a broad community of academic, industrial, and national laboratory r…
View article: Hugoniot, sound speed, and phase transitions of single-crystal sapphire for pressures 0.2–2.1 TPa
Hugoniot, sound speed, and phase transitions of single-crystal sapphire for pressures 0.2–2.1 TPa Open
Sapphire (Al2O3) is a major constituent of the Earth's mantle and has significant contributions to the field of high-pressure physics. Constraining its Hugoniot over a wide pressure range and identifying the location of shock-driven phase …
View article: Dynamic high pressure phase transformation of ZrW2O8
Dynamic high pressure phase transformation of ZrW2O8 Open
Phase transformations under high strain rates (dynamic compression) are examined in situ on ZrW2O8, a negative thermal expansion ternary ceramic displaying polymorphism. Amorphization, consistent with prior quasi-static measurements, was o…
View article: Shock compression of poly(methyl methacrylate) PMMA in the 1000 GPa regime: Z machine experiments
Shock compression of poly(methyl methacrylate) PMMA in the 1000 GPa regime: Z machine experiments Open
Hydrocarbon polymers are used in a wide variety of practical applications. In the field of dynamic compression at extreme pressures, these polymers are used at several high energy density (HED) experimental facilities. One of the most comm…
View article: LDRD 226360 Final Project Report: Simulated X-ray Diffraction and Machine Learning for Optimizing Dynamic Experiment Analysis
LDRD 226360 Final Project Report: Simulated X-ray Diffraction and Machine Learning for Optimizing Dynamic Experiment Analysis Open
This report is the final documentation for the one-year LDRD project 226360: Simulated X-ray Diffraction and Machine Learning for Optimizing Dynamic Experiment Analysis. As Sandia has successfully developed in-house X-ray diffraction tools…