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Tuesday, April 29, 2014: 1:00PM

LCLS Building 901, Redtail Hawk Conference Rooms

Speaker: Richard Sandberg (Laboratory for Ultrafast Materials and Optical Science, Los Alamos National Laboratory)

 

Abstract

The response of micron-scale inhomogeneities dictates the overall dynamic response of many material systems including failure under strain in structural materials, dynamics of nanoscale magnetic ordering, and when and why explosives detonate. The brilliant ultrafast X-ray pulses from 4th generation light sources like the LCLS are particularly well suited for micron-scale materials studies due to their short wavelength and ability to penetrate bulk materials.  In this talk, I will highlight our team’s progress towards ultrafast materials imaging studies with both large scale and tabletop sources.  I will also present results from a January 2014 LCLS beamtime at the Materials in Extreme Conditions (MEC) hutch.  There, we imaged the shock wave interactions with 10 micron voids in two single crystal materials with near 100 nm resolution: lithium floride (LiF) and the explosive pentaerythritol tetranitrate (PETN). Shock wave interactions with voids in explosive are of particular interest due to the prevailing theory that the transition to detonation is caused by void collapse..