Equation of State Experiments in the Pressure Region Near 20 Megabars
About seven years ago a program was initiated at the Los Alamos Scientific Laboratory (LASL) to use underground nuclear explosions to obtain equation of state (EOS) data at high pressures. The main goals of this program are to determine several Hugoniot points in the 1.0 to 3.0 TPa (10 to 30 Mbar) pressure region for a standard material and then use this standard in impedance-matching experiments. In such experiments, Hugoniot data for other sample materials are obtained relative to the standard from measurements of the shock velocities in both the standard and the sample. A number of Soviet investigators [1–5] have used a similar approach, with lead as their standard material. In these experiments they used shocks generated by underground explosions to obtain Hugoniot data for several materials in the 1.0 to 5.0 TPa pressure region, relative to lead. However; they relied upon an extrapolation of the lead Hugoniot from the region of available experimental data to the region where the Thomas-Fermi-Dirac (TFD) statistical model of the atom is believed applicable. This extrapolation procedure is subject to uncertainty, and if a few experimental points could be obtained in the intermediate pressure region for lead or any other standard, then this uncertainty could be reduced by removing the possibility of any gross unanticipated phenomena.
KeywordsParticle Velocity Pressure Region Shock Velocity Underground Explosion Underground Nuclear Explosion
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