Physics – Plasma Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dppbi3006m&link_type=abstract
American Physical Society, 42nd Annual Meeting of the APS Division of Plasma Physics combined with the 10th International Congre
Physics
Plasma Physics
Scientific paper
The properties of hydrogen and its isotopes at high pressure and high density are important to current issues in ICF target design, the physics of condensed matter, and to current models of planetary structure. At high pressure, hydrogen is expected to change from a molecular phase to a metallic or strongly coupled plasma state. This transition region is not well understood and current theoretical models for the Equation-of-State (EOS) of hydrogen vary substantially in their predictions. These discrepancies are particularly important for shock compression because they may lead to a 40hydrogen and change the drive requirements for ICF fusion. Previous shock experiments at LLNL on the Nova Laser Facility have measured large increases in the compressibility of deuterium. These results are not well reproduced by the latest theory and there exists a need for independent experiments to resolve these discrepancies. New deuterium shock wave experiments to probe the EOS of deuterium were executed on the Nike facility at NRL. The Nike facility, with its ultra smooth ISI illumination, producing planar and steady drive, was well positioned to address this issue. Reflected shocks were utilized to increase the shock pressure and to enhance the sensitivity to differences in compressibility. The results of these experiments showed that liquid deuterium must have a much higher compressibility than is predicted by the SESAME EOS and have verified the initial LLNL results. New ICF target designs may also need to use deuterium wicked foams that will have an even more complicated EOS. We are examining shocks in such foams and other materials of ICF interest.
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