Journal Article X-ray diffraction simulation molecular dynamics 2D diffraction ring fitting English Abstract Nucleic Acids Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. X-ray diffraction crystal rotation diamond diamond anvil cell compression diffraction simulation high-pressure density and strength lattice strain material strength nanocrystalline Ta parallel computing polychromatic beam reciprocal space mapping shock compression single-crystal tantalum strain field strain tensor synchrotron X-ray Laue diffraction synchrotron undulator sources