Laser-driven shock compression on precompressed water: Exploring icy giant interiors

Details Laser-driven shock compression on precompressed water: Exploring icy giant interiors Laser-driven shock compression on precompressed water: Exploring icy giant interiors

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.v32g..06l&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #V32G-06

Physics

3924 High-Pressure Behavior, 3944 Shock Wave Experiments, 5709 Composition, 5724 Interiors (8147), 5754 Physical Properties Of Materials

Scientific paper

Although the giant gas planets are comprised of mostly hydrogen and helium, the icy giants Neptune and Uranus are believed to be composed of ˜50% water (by mass), as well as significant amounts of methane and ammonia (Hubbard, 1984). Most of the water is in an ultra-condensed, high-temperature state forming an "icy" interior layer with pressures ranging between 10 and 500 GPa and temperatures between 2000 and 5000 K (Hubbard, 1997). It is theorized that it is in this hot, dense layer that the planet's magnetic field is produced. To explore the physical properties of water at the extreme conditions of this icy interior layer, we performed laser-driven shock experiments on precompressed samples accessing thermodynamic conditions unreachable by either static or single-shock compression techniques alone. Recent experiments using Rutherford Appleton Laboratory's Vulcan Laser achieved final pressures up to ˜200 GPa and temperatures up to 5,000 K in water samples precompressed in a diamond cell to ˜1 GPa, thereby validating this new technique.

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