European XFEL Seminar

Probe structural dynamics at dynamic extremes with advanced X-ray sources: Opportunities and challenge

by Luo Sheng-Nian (The Peac Institute of Multiscale Sciences, Chengdu China)

Room. E1.173 (European XFEL, Main Building (XHQ))

Room. E1.173

European XFEL, Main Building (XHQ)

One of the grand challenges in shock physics is dynamic responses to impulsive loading, due to their highly transient nature and extremely complex microstructure effects. Dynamic responses, such as plasticity, damage, cavitation, phase changes, hydrodynamic instabilities, and chemical reactions, are inherently multiscale and heavily dependent on microstructure and loading paths. Advanced X-ray imaging and scattering allow for probing materials response at length scales ranging from lattice to micron, and catching structure dynamics in motion with fs temporal resolutions. We will discuss technical aspects for dynamic X-ray diagnostics and specific applications in phase changes, deformation, strength, and damage, including nonequilibrium phenomena for which XFELs are of particular advantage. As an application case, we demonstrate the feasibility of SAXS for investigating the fundamental physics of nanoscale fragmentation of hypervelocity liquid jets, by virtue of ultralarge molecular dynamics simulations and a GPU-based parallel scattering calculation. Brief biography: Prof. Sheng-Nian Luo is Director of the Peac Institute of Multiscale Sciences (PIMS), a Distinguished Professor of Materials Physics at Southwest Jiaotong University, and a “1000-Talent Plan” Scholar of the Chinese Central Government. He obtained his B.S. and Ph.D. from University of Science and Technology of China, and California Institute of Technology, respectively, and had been a permanent physicist at Physics Division, Los Alamos National Laboratory. His research focuses on shock physics, matter at dynamic extremes, ultrafast X-ray diagnostics, and high performance computation. He has published about 190 journal papers.