Abstract
Laboratory measurements of the shock Hugoniot at high pressure, exceeding several hundred Mbar, are of great importance in the understanding and accurate modeling of matter at extreme conditions. In this work we present a platform to measure the material properties, specifically the single shock Hugoniot and electron temperature, at extreme pressures of ∼Gbar at the National Ignition Facility (NIF). In these experiments we launch spherically convergent shocks into solid CH, using a Hohlraum radiation drive. X-ray radiography is applied to measure the shock speed and infer the mass density profile, enabling determining of the material pressure and Hugoniot equation of state. X-ray scattering is applied to measure the electron temperature through measurement of the electron velocity distribution.
Highlights
Shock Hugoniot measurements of matter at high energy density are important for understanding the structure and evolution of gas-giant planets [1, 2, 3] or highly evolved stars [4]
Benchmarking dense matter models in the regime that is relevant for fusion energy experiments, which assemble material to the highest densities and pressures ever achieved in the laboratory [6, 7] is important. We create these conditions in the laboratory using high-energy lasers at the National Ignition Facility (NIF) [8]
We track the shock wave traveling through the target via streaked x-ray radiography as a function of radius and time
Summary
Shock Hugoniot measurements of matter at high energy density are important for understanding the structure and evolution of gas-giant planets [1, 2, 3] or highly evolved stars [4]. In these experiments we drive a strong convergent shock wave through solid spherical targets in an indirectly driven laser geometry and characterize the Hugoniot and electron temperature using x-ray radiography [9, 10, 11] and x-ray Thomson scattering [12, 13, 14, 15, 16, 17, 18, 19]. We measure the mass density profile and shock speed from the radiographic signal, and infer the pressure in the shocked region using the Hugoniot relations.
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