Bulletin of the American Physical Society
21st Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 64, Number 8
Sunday–Friday, June 16–21, 2019; Portland, Oregon
Session L3: AETD: Hugoniot Measurements |
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Chair: Saryu Fensin, LANL Room: Pavilion East |
Tuesday, June 18, 2019 4:00PM - 4:15PM |
L3.00001: Measurements of Dynamically Compressed Liquid Structure beyond 3 Mbar Using X-Ray Diffraction Amy L Coleman, Richard Briggs, Federica Coppari, Amalia Fernandez-Panella, Martin G Gorman, Ray F Smith, Sally J Tracy, Jon H Eggert, Dayne E Fratanduono The study of liquid structures at high-energy densities is an important field that has long been impeded by experimental limitations. Static diamond anvil cell techniques have traditionally been used to determine liquid structures at high-P but are limited by small sample sizes and large background contributions. Dynamic compression presents an alternative approach. As well as providing access to P and T states that are not accessible using static compression methods, the sample package does not include mm-thick diamonds that contribute to large backgrounds. Here we present some of the first liquid structures, shock compressed to beyond 3 Mbar, obtained at the Dynamic Compression Sector (DCS), of the Advanced Photon Source. The liquid structure factors of several metallic elements have been determined using procedures established by the static community and are presented here as well as a discussion of the challenges associated with this type of research. (This work was performed under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344) [Preview Abstract] |
Tuesday, June 18, 2019 4:15PM - 4:30PM |
L3.00002: First observation of bcc gold and melting on the shock Hugoniot measured using x-ray diffraction Richard Briggs, Federica Coppari, Martin Gorman, Ray Smith, Sally Tracy, Amy Coleman, Amalia Fernandez-Panella, Marius Millot, Jon Eggert, Dayne Fratanduono Au is one of the most recognizable and noblest of the elements in the periodic table. Its face-centered cubic crystal structure was observed in static experiments at room temperature up to almost two-fold compression, inviting a myriad of theoretical work on its structural stability. Here we report the first observation of bcc gold near 220 GPa on the shock Hugoniot, using dynamic compression and \textit{in situ} x-ray diffraction. Experiments were carried out at the Dynamic Compression Sector of the Advanced Photon Source. A high-energy laser ($\textless$ 80 J at 351 nm, 5 or 10 ns flat top) sent an ablatively-driven shockwave through a polyimide ablator and the Au sample glued to a LiF window. Velocimetry measurements were made at the Au/LiF interface to determine pressure using impedance matching techniques. At pressures above 250 GPa, shock-induced melting is observed and is completed by 323 GPa, providing experimental constrains on the melting curve of gold on the Hugoniot. [Preview Abstract] |
Tuesday, June 18, 2019 4:30PM - 4:45PM |
L3.00003: Ultrahigh-pressure Hugoniot equations of state up to TPa based on three-stage gas gun Jianbo Hu, Xiang Wang, Chengda Dai, Qiang Wu A three-stage gas gun, composed of a two-stage gas gun and the add-on part, has been developed to launch high-Z flyer plates up to 10 km/s for ultrahigh-pressure Hugoniot measurements. Great care was taken to optimize the add-on part to satisfy the requirements for high-precision Hugoniot measurements. With such a hypervelocity launcher technique, we measured Hugoniot equations of state (EOS) of metals of interest up to TPa. Results show that Hugoniot EOS of Ta, Mo, and Pt remain linear while those of Au, Bi, and Fe exhibit certain nonlinearity. The underlying physics of the observed nonlinear behavior has been qualitatively discussed. [Preview Abstract] |
Tuesday, June 18, 2019 4:45PM - 5:00PM |
L3.00004: Hugoniot of Meso-Erythritol as an Inert Surrogate for PETN Zakary Wilde, Pedro Peralta Inert surrogates for high explosives provide low-risk options to understand basic material response to extreme conditions such as high pressure and high strain rates. Meso-Erythritol is under evaluation as a shock surrogate for Pentaerythritol Tetranitrate (PETN) due to their similar crystal structures and melting points. However, no Hugoniot data for Meso-Erythritol currently exists. Gas gun experiments will be performed to determine the Hugoniot of Meso-Erythritol as both power compacts and monolithic single crystals. Timing pins and VISAR will be used to measure the shock and particle velocities. Experiments will investigate particle velocities of up to 600 meters per second. The results will be compared to the Hugoniot of PETN to evaluate similarities in shock behavior. [Preview Abstract] |
Tuesday, June 18, 2019 5:00PM - 5:15PM |
L3.00005: Hugoniot Temperatures of LiF at High Pressures and Temperatures Ryan Crum, Eric Dutra, Kathy Opachich, Dawn Graninger, David Brantley, Ricky Chau, Minta Akin LiF is commonly utilized in dynamic experiments, especially as windows, but there are significant constraints upon our understanding of its Hugoniot temperature at elevated pressures. Currently, models provide significantly contrasting temperatures for a given pressure along the Hugoniot and this is due to a lack of experimental results to constrain them. Here, LiF was dynamically compressed in excess of 100 GPa while a set of pyrometers measured radiative intensity of the LiF at several wavelengths to determine its temperature via the blackbody function. Results from this study are applied to evaluate current EOS assumptions for LiF, error for such experiments, and where improvements can be made in both experiments and modeling. [Preview Abstract] |
Tuesday, June 18, 2019 5:15PM - 5:30PM |
L3.00006: Gbar-range Hugoniot equation of state of Boron Amy Lazicki, Damian Swift, Heather Whitley, Tilo Doeppner, Madison Martin, Michelle Marshall, David Erskine, Richard London, Dayne Fratanduono, Peter Celliers, Jon Eggert, Natalie Kostinski, Brian Maddox, Shuai Zhang, Brian Wilson, Walter Johnson, Joseph Nilsen Using convergent drive geometries and large-scale laser facilities, it is now possible to experimentally access high-pressure, high-temperature regimes of phase space where the thermal excitation of bound electrons has a measurable effect on plasma compressibility.~ These states are important for modeling extreme astrophysical phenomena and fusion-energy experiments.~~ Equation of state models have high uncertainty in this regime because of the lack of benchmarking experimental data.~ We will present new data on elemental boron spanning pressures of 10's of Mbar to near 1 Gbar, using planar and spherically-convergent drive platforms on the NIF laser facility, to test a range of equation of state models.~ [Preview Abstract] |
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