Inferring temperature from x-ray diffraction of Pb ramp-compressed to 840 GPa
ORAL
Abstract
We will report x-ray diffraction measurements of body-centered-cubic lead (Pb) compressed quasi-isentropically, with ramp-shaped laser pulses at the National Ignition Facility, to pressures between 190 and 840 GPa. We have used the Debye-Waller attenuation of diffraction peak intensities relative to an ideal, unperturbed lattice to determine mean squared displacement of the atoms about their ideal positions, and have related this to temperature, using quantum molecular dynamics calculations of the Debye temperature at high pressure and temperature. We will comment on the general prospects for diagnosing temperature in dynamic-compression experiments from x-ray diffraction, and the associated systematic uncertainties.
*This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. Lawrence Livermore National Security, LLC
–
Presenters
Amy E Lazicki
Lawrence Livermore National Laboratory
Authors
Amy E Lazicki
Lawrence Livermore National Laboratory
Stanimir A Bonev
Lawrence Livermore National Laboratory
Lawrence Livermore Natl Lab
Dave Braun
Lawrence Livermore Natl Lab
Richard Briggs
Lawrence Livermore National Laboratory
Gilbert W Collins
University of Rochester
Laboratory for Laser Energetics
Amy L Coleman
Lawrence Livermore National Laboratory
Federica Coppari
Lawrence Livermore National Laboratory
Dayne E Fratanduono
Lawrence Livermore National Laboratory
Martin G Gorman
First Light Fusion
Richard Gordon Kraus
University of Nevada, Reno
Andrew Krygier
Lawrence Livermore National Laboratory
James M McNaney
Lawrence Livermore National Laboratory
Marius Millot
Lawrence Livermore National Laboratory
Yuan Ping
Lawrence Livermore National Laboratory
J. Ryan R Rygg
Laboratory for Laser Energetics, University of Rochester
