Analysis of laser shock experiments on precompressed samples using a quartz reference and application to warm dense hydrogen and helium

Megabar (1 Mbar = 100 GPa) laser shocks on precompressed samples allow reaching unprecedented high densities and moderately high ∼103–104 K temperatures. We describe here a complete analysis framework for the velocimetry (VISAR) and pyrometry (SOP) data produced in these experiments. Since the preco...

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Bibliographic Details
Published in:Journal of applied physics 2015-11, Vol.118 (19)
Main Authors: Brygoo, Stephanie, Millot, Marius, Loubeyre, Paul, Lazicki, Amy E., Hamel, Sebastien, Qi, Tingting, Celliers, Peter M., Coppari, Federica, Eggert, Jon H., Fratanduono, Dayne E., Hicks, Damien G., Rygg, J. Ryan, Smith, Raymond F., Swift, Damian C., Collins, Gilbert W., Jeanloz, Raymond
Format: Article
Language:English
Subjects:
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Computer simulation
Density functional theory
Equations of state
Helium
Molecular dynamics
Pyrometry
Quartz
Reflectance
reflectivity
shock waves
silica
Silicon dioxide
Velocimetry
Velocity measurement
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Summary:Megabar (1 Mbar = 100 GPa) laser shocks on precompressed samples allow reaching unprecedented high densities and moderately high ∼103–104 K temperatures. We describe here a complete analysis framework for the velocimetry (VISAR) and pyrometry (SOP) data produced in these experiments. Since the precompression increases the initial density of both the sample of interest and the quartz reference for pressure-density, reflectivity, and temperature measurements, we describe analytical corrections based on available experimental data on warm dense silica and density-functional-theory based molecular dynamics computer simulations. Using our improved analysis framework, we report a re-analysis of previously published data on warm dense hydrogen and helium, compare the newly inferred pressure, density, and temperature data with most advanced equation of state models and provide updated reflectivity values.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4935295