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 N3: AETD: User facilities |
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Chair: Joe Zaug, LANL Room: Pavilion East |
Wednesday, June 19, 2019 9:15AM - 9:30AM |
N3.00001: The Laser Shock Station in the Dynamic Compression Sector Xiaoming Wang, Doug Broege, Jake Bromage, Robert Earley, Dale Guy, James Hawreliak, Yuelin Li, Paulo Rigg, Adam Schuman, John Sethian, Nicholas Sinclair, Yoshimasa Toyoda, Nicholas Weir, Brendan Williams, Jun Zhang, Jon Zuegel, Y. M. Gupta The Laser Shock Station in the Dynamic Compression Sector [Advanced Photon Source (APS), Argonne National Laboratory] links a laser-driven shock compression platform with high energy x-ray pulses from the APS to achieve \textit{in-situ}, time-resolved x-ray diffraction measurements in materials subjected to well-characterized, high stress, short duration planar shock waves. The laser shock driver, a highly reproducible, 100J laser system (351nm) with pulse shaping, beam shaping and smoothing, and energy tuning capabilities, produces shock waves in samples over a broad range of stresses. Synchronization of the laser-generated shock wave to within 300ps of a single x-ray pulse allows detailed investigations of shock-induced structural changes at the atomistic level (with simultaneous continuum measurements using laser interferometry). With the capability of one shot every 30 minutes, the Laser Shock Station offers a highly versatile and productive platform for dynamic compression science. A detailed description of this capability -- along with representative results -- will be presented. Work supported by DOE/NNSA. [Preview Abstract] |
Wednesday, June 19, 2019 9:30AM - 9:45AM |
N3.00002: The transit to detonation in high explosives Neil Bourne, David Eastwood, Sebastian Marussi, Gary Parker, Peter Dickson, Robert Atwood, Thomas Connelly, Doug Wagstaff, Anna Martinez Accidents with explosive materials are still too common after 100 years of using them. The manner by which they transit from burn to detonation (DDT) after a random thermal event, such as an electrical arc or by friction if a package is dropped, is by far the single biggest risk associated with explosives storage and use but is a particularly difficult process to observe and quantify. Thus there are no verified theoretical frameworks for the process and no useful predictive modelling capabilities. Recent experiments conducted at the Diamond Synchrotron have yielded ground-breaking, time-resolved observations of DDT for the first time. Initial analysis has shown that this opens a new area of opportunity for fast imaging at synchrotrons. The work has opened a window on critical processes that occur within burn to detonation providing a new framework for understanding how to handle the materials more safely. [Preview Abstract] |
Wednesday, June 19, 2019 9:45AM - 10:15AM |
N3.00003: Recent Advances at the Dynamic Compression Sector Invited Speaker: P. A. Rigg The Dynamic Compression Sector (DCS) at the Advanced Photon Source (APS), Argonne National Laboratory -- a first-of-its-kind user facility -- achieved full user operations in all four experimental end stations in 2018. With a diverse set of dynamic compression drivers linked to 80ps, bright, hard x-ray pulses from a synchrotron, the DCS user community has made significant and broad advances in addressing long-standing questions in dynamic compression science. An overview of the DCS capabilities and operations -- including the process for user experiments -- will be presented along with representative results obtained to date. Work supported by DOE/NNSA. [Preview Abstract] |
Wednesday, June 19, 2019 10:15AM - 10:30AM |
N3.00004: Workflow and visual analysis for XFEL shock physics experiments using Cinema:Bandit Cynthia Bolme, Daniel Orban, Divya Banesh, Cameron Tauxe, Chris Biwer, Ayan Biswas, Ramon Saavedra, Christine Sweeney, Richard Sandberg, James Ahrens, David Rogers Recent shock physics capability developments at X-ray light sources have resulted in the performance of experiments at much higher rates and with very disparate data types. The data from these experiments commonly consists of velocimetry data that provide information about bulk volumetric response of the material, X-ray diffraction data that give information about the lattice-level material changes, and metadata for the material pedigree/initial microstructure and the performance of the X-ray light source. We have developed a new computational tool and workflow to explore and visualize these data during an X-ray beamline experiment. This workflow was deployed on a recent shock physics experiment at the Linac Coherent Light Source with processed data displayed in the modular, web-based application. [Preview Abstract] |
Wednesday, June 19, 2019 10:30AM - 10:45AM |
N3.00005: EXAFS measurements of ramp-compressed iron at the National Ignition Facility (NIF) F. Coppari, A. G. Krygier, Y. Ping, J. M. McNaney, G. E. Kemp, D. Braun, D. B. Thorn, M. Millot, P. C. Celliers, O. Landen, M. B. Schneider, Hye-Sook Park, B. A. Remington, J. H. Eggert Ramp-compression and X-ray diagnostics enable compression and characterization \textit{in-situ} of the transformations happening at extreme laser-driven conditions. Density and pressure can be determined using appropriate calibration standards. However, to fully characterize material properties, temperature determination is key, although difficult to measure in dynamic compression experiments. Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy being sensitive to the local thermal disorder, is a valuable diagnostic. A platform for EXAFS measurements exists at the Omega Laser Facility and its development at NIF is underway. EXAFS measurements require a bright, spectrally smooth, and broad-band x-ray source that can be generated by capsule implosion or laser-irradiated metallic foils. A crystal spectrometer disperses the x-rays and image plate detectors measure the absorption spectra in transmission. EXAFS measurements at the iron K-edge have been collected on the NIF. I will describe the experimental platform and the new ramp-compressed iron data. Pressure, density and temperature determination will be discussed in the framework of the characterization of the iron phase diagram at extreme conditions. [Preview Abstract] |
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