Here, simulations of X-ray diffraction of shock-compressed single-crystal tantalum with realistic undulator sources are reported, based on large-scale molecular dynamics simulations. Polychromatic synchrotron undulator X-ray sources are useful for ultrafast single-crystal diffraction under shock compression. Simulations of X-ray diffraction of shock-compressed single-crystal tantalum with synchrotron undulator sourcesĭOE Office of Scientific and Technical Information (OSTI.GOV) Diffraction patterns and reciprocal space nodes are obtained from atomic configurations for different loading (elastic and plastic) and detection conditions, and interpretation of the diffraction patterns is discussed. Transmission-mode diffraction simulations consider crystallographic orientation, loading direction, incident beam direction, X-ray spectrum bandwidth and realistic detector size. Purely elastic deformation, elastic-plastic two-wave structure, and severe plastic deformation under different impact velocities are explored, as well as an edge release case. Simulations of X-ray diffraction of shock-compressed single-crystal tantalum with synchrotron undulator sources. As a result, a clear correlation between growthmore » rate and dislocation density is observed, though growth rate is not the only parameter impacting the quality.« less The best quality crystal was grown using the Kyropoulos technique with a dislocation density of 10 2-10 3 cm -2 and a small area with approximately 2*2 mm 2 did not show dislocation contrast in many reflections and has suitable quality for application as a backscattering monochromator.
The investigations confirmed that the main defect types are dislocations. Structural defects were studied by means of laboratory double- crystal X-ray diffractometry and white beam synchrotron-radiation topography. We report on the growth and characterization of several sapphire single crystals for the purpose of x-ray optics applications. Single-crystal sapphire microstructure for high-resolution synchrotron X-ray monochromatorsĪsadchikov, Victor E.
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