Absolute Equation of State Measurements on Shocked Liquid Deuterium up to 200 GPa (2 Mbar)

Abstract

We present results of the first measurements of density, shock speed and particle speed in compressed liquid deuterium at pressures in excess of 1 Mbar. We have performed equation of state (EOS) measurements on the principal Hugoniot of liquid deuterium from 0.2 to 2 Mbar. We employ high-resolution radiography to simultaneously measure the shock and particle speeds in the deuterium, as well as to directly measure the compression of the sample. We are also attempting to measure the color temperature of the shocked D2. Key to this effort is the development and implementation of interferometric methods in order to carefully characterize the profile and steadiness of the shock and the level of preheat in the samples. These experiments allow us to differentiate between the accepted EOS model for D2 and a new model which includes the effects of molecular dissociation on the EOS.

Metallization of fluid hydrogen

“…Although this conductivity does not conform to metallic values, this experiment demonstrates that the electrical conductivity increases at high pressure and temperature. Shock Hugoniot and temperature data have also been measured [18][19][20].…”

X-ray diffraction of molybdenum under shock compression to 450 GPa

“…Previous shock wave studies of molybdenum provided only constraints on the equation of state 16 or sound velocities 2,9,37 and could not directly determine the stability of different phases. Laserdriven dynamic compression experiments have emerged in recent years as a novel technique for probing the ultra-high pressure behavior of materials [38][39][40] . In laser-shock experiments, the application of pulsed high-powered laser energy ablates the surface of a sample creating a hot, expanding plasma which exerts pressure on the surrounding material resulting in the propagation of a strong shock wave through the sample.…”

The role of strong coupling in z-pinch-driven approaches to high yield inertial confinement fusion

“…Recent data from researchers at LLNL [12] suggest that deuterium might be more compressible than previously thought due to molecular disassociation.. If this increased compressibility is confirmed, then lhc fuel in the lCF target will bc easier to compress and the yields will .…”