2018 Physics/Theoretical Colloquium

 

Thursday, May 17, 2018

3:30 – 4:30 p.m.

Rosen Auditorium (TA-53, Bldg. 1)

Refreshments at 3:15pm

 

Speaker: Dr. Brian J. Jensen

M-9: SHOCK AND DETONATION PHYSICS

Los Alamos National laboratory

 

“Examining Material Response using X-ray Diagnostics at the Advanced Photon Source”

 

Abstract: 

The development of advanced X-ray diagnostics such as phase contrast imaging (PCI) and X-ray diffraction (XRD) offer unique opportunities for ultrafast, high-resolution measurements to examine dynamic materials response. A number of capabilities now exist that couple dynamic compression capabilities to beam lines at light sources including the IMPULSE (IMPact system for ULtrafast Synchrotron Experiments) capability and the Dynamic Compression Sector (DCS) both located at the Advanced Photon Source (APS).  LANL researchers have contributed to these efforts through diagnostics, platform, and technique development, and by conducting numerous dynamic experiments at the APS since 2011.   In particular, LANL has led the development of a novel multi-frame X-ray PCI (mPCI) system that has been used to obtain the first shock-movies to capture material deformation on the nanosecond time scale with 1-5 micrometer spatial resolution.  The mPCI system has been systematically developed over the years to improve optical efficiencies and spatial resolution, to obtain more images per experiment (8 frames possible), and to develop a dual-imaging, dual-zoom feature useful for many applications.  In this talk, we briefly discuss current capabilities, on-going efforts, and highlight examples of recent research efforts that use X-ray diffraction (XRD) and X-ray phase contrast imaging (PCI) to study material response across length and time scales.   The results and efforts described here show our efforts to develop and utilize new capabilities at advanced light sources to address some of the key scientific issues of today.