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Proceedings Paper

X-ray diffraction by crystals during shocks
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Paper Abstract

X-ray diffraction during transient events requires a high x-ray brightness source which is spatially collimated or spectrally concentrated, as well as synchronizable to the event. Perhaps the most demanding transient event to study is the shockwave, because the event moves at high speed and the sample possesses a high density of mechanical energy which can be hazardous to the measuring apparatus. The properties of diffraction--narrow angular acceptance, spectral requirements, shallow penetration depths, line-of-sight integration--are both enabling and limiting. This paper will discuss the factors involved in transient x-ray diffraction experiments of shocks, to include a summary of past work, and an orientation to the use of laser plasmas for both x-ray pulse production and shock generation. We have diffractively probed laser shocks in the launching of elastic compression waves and their reflection from a free surface, and have probed orthogonal lattice planes simultaneously to reveal directional differences in compression. Diffraction imaging (topography) with approximately 50 micrometers resolution has revealed microstructural effects. A focusing powder spectrum has been acquired in a static experiment. We have used x-ray streak cameras to record diffraction patterns with 50 ps resolution.

Paper Details

Date Published: 1 September 1995
PDF: 12 pages
Proc. SPIE 2521, Time-Resolved Electron and X-Ray Diffraction, (1 September 1995); doi: 10.1117/12.218354
Show Author Affiliations
Robert R. Whitlock, Naval Research Lab. (United States)
Justin S. Wark, Univ. of Oxford (United Kingdom)

Published in SPIE Proceedings Vol. 2521:
Time-Resolved Electron and X-Ray Diffraction
Peter M. Rentzepis, Editor(s)

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