Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session E04: Multiphase EOS Experimental Measurements IFocus Recordings Available
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Chair: Suzanne Sheehe, Lawrence Livermore Natl Lab Room: Anaheim Marriott Platinum 2 |
Monday, July 11, 2022 2:00PM - 2:15PM |
E04.00001: Refined measurement of the compressibility of solid platinum under ramped compression to 500 GPa at the Z machine Jean-Paul Davis, Justin L Brown Quasi-isentropic, shockless ramp-wave experiments at Sandia’s Z machine provide high-precision, high-accuracy absolute measurements of the compressibility of solids at relatively low temperatures and up to multi-megabar pressures, where isothermal diamond-anvil techniques have limited pressure accuracy due to reliance on theoretical equations of state for calibration standards. One such commonly used standard is platinum, due to its phase stability, chemical inertness, and high X-ray scattering power. A recently published calibration of platinum [D. E. Fratanduono et al, Science 372, 1063–1068 (2021)] relied on data from experiments at Z under 400 GPa to constrain the result from National Ignition Facility experiments at higher pressure and attain an unprecedented one-sigma pressure uncertainty of less than 4% at 800 GPa. Additional, higher-precision Z experiments not included in that work offer an opportunity to further reduce uncertainty. We present results from eleven independent measurements of platinum ramp-compressed to as high as 500 GPa using both inverse Lagrangian analysis and Bayesian calibration methods. |
Monday, July 11, 2022 2:15PM - 2:45PM |
E04.00002: Phase diagram measurements to aid multi-phase equation of state construction Invited Speaker: June K Wicks Experimental measurements of temperature and crystal structure at high pressures can be used to determine the equation of state of a material in a determined range of conditions. In shock compression experiments, the sampled states along a Hugoniot can cross multiple phase boundaries, necessitating the creation of multi-phase equation of states. Under high-power laser compression, the material’s state ranges from ambient pressure at start, to high temperatures in drive plasmas and high pressures of GPa to TPa in shocked states. In this talk, I will describe some of the experimental challenges that we have tackled in Streaked Optical Pyrometry measurements of MgO and in situ X-ray diffraction measurements of MgO, Cu, and Al2O3, where measurements that vary as a function of crystallographic orientation and texture grant insight into deformation pathways. |
Monday, July 11, 2022 2:45PM - 3:00PM |
E04.00003: A Multi-phase Equation of State for Magnesium with Uncertainty Quantification Beth Lindquist There are several sources of uncertainty involved in the calibration of an equation of state (EOS) model: calibration data will in general have some error, and there might be degeneracy where multiple parameters sets might produce essentially identical output. Uncertainty quantification allows for the determination of an ensemble of statistically weighted parameter sets that are consistent with the calibration data. These distributions can be used to determine a range of outcomes in downstream applications of the EOS model. In this talk, we describe a Bayesian approach to uncertainty quantification for a multi-phase EOS for the HCP, BCC, and liquid phases of Magnesium over a large range of temperatures and densities. |
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