X-Ray Diffraction on NIF

Eggert, J H; Wark, J

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DOE OSTI · 1036870

X-Ray Diffraction on NIF

Eggert, J H·Wark, J

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Abstract

The National Ignition Facility (NIF) is currently a 192 beam, 1.6 MJ laser. NIF Ramp-Compression Experiments have already made the relevant exo-planet pressure range from 1 to 50 Mbar accessible. We Proposed to Study Carbon Phases by X-Ray Diffraction on NIF. Just a few years ago, ultra-high pressure phase diagrams for materials were very 'simple'. New experiments and theories point out surprising and decidedly complex behavior at the highest pressures considered. High pressures phases of aluminum are also predicted to be complex. Recent metadynamics survey of carbon proposed a dynamic pathway among multiple phases. We need to develop diagnostics and techniques to explore this new regime of highly compressed matter science. X-Ray Diffraction - Understand the phase diagram/EOS/strength/texture of materials to 10's of Mbar. Strategy and physics goals: (1) Powder diffraction; (2) Begin with diamond; (3) Continue with metals etc.; (4) Explore phase diagrams; (5) Develop liquid diffraction; and (6) Reduce background/improve resolution.

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ALUMINIUM CARBON DIFFRACTION PHASE DIAGRAMS PHYSICS PRESSURE RANGE RESOLUTION US NATIONAL IGNITION FACILITY X-RAY DIFFRACTION

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Eggert, J H, Wark, J. 2012-02-15. X-Ray Diffraction on NIF. https://www.osti.gov/biblio/1036870

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