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 F03: X-Ray DiagnosticsRecordings Available
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Chair: Andrew Krygier, Lawrence Livermore National Laboratory Room: Anaheim Marriott Platinum 1 |
Monday, July 11, 2022 3:30PM - 3:45PM |
F03.00001: X-ray diffraction of materials under ramp compression on the Thor pulsed-power generator Tommy Ao, Dane V Morgan, J Matthew D Lane, Kevin N Austin, Eric W Breden, Justin L Brown, Sakun Duwal, Hongyou Fan, Patricia Kalita, Marcus Knudson, Lena M Pacheco, Mark A Rodriguez, Brian S Stoltzfus, Joshua M Usher Thor is a pulsed-power generator which uses magnetic loading to produce well-controlled ramp compression for high-pressure research of material response and equation-of-state. Thor has recently been configured with a compact x-ray diffraction (XRD) capability to allow investigation of atomic-scale response under dynamic compression, such as crystal lattice compression, onset of plastic flow, strength-strain rate dependence, structural phase transitions, and density of crystal defects such as dislocations. We describe our cost effective, compact x-ray source implementation and present ambient and dynamic data for several materials with solid-solid phase transformations in the 1 to 10 GPa pressure range (e.g. CdS, Zr). We have found the combination of magnetically-driven ramp compression with single, short-pulse XRD diagnostic to be a powerful new capability for the dynamic materials research. |
Monday, July 11, 2022 3:45PM - 4:00PM |
F03.00002: High Energy XRD Measurements in Shock Wave Experiments: A New Capability Paulo A Rigg, Yuelin Li, Raymond Conley, Pinaki Das, Ray Gunawidjaja, Nicholas Sinclair, Drew Rickerson, Yogendra M Gupta Real-time, in-situ x-ray diffraction (XRD) measurements at the Dynamic Compression Sector (DCS), located at the Advanced Photon Source (APS), constituted a pioneering development in shock wave science. To date, the measurements have been limited to 23 keV x-rays (7 – 23 keV). There is a need to obtain XRD results at significantly higher photon energies to investigate thicker and higher density materials and with higher q-range than currently possible. Toward this goal, we have developed the capability – using a single multi-layer monochromator (SMM) – to isolate x-rays between 7 and 40 keV with approximately 1% bandwidth and > 90% transmission of the peak spectral flux at the highest energies. Experimental data have been successfully obtained at 36 and 40 keV and the same will be presented to show benefits of such results. The broad scientific applicability of this development and how measurements at even higher energy x-rays can be accessed will be discussed. |
Monday, July 11, 2022 4:00PM - 4:15PM |
F03.00003: Implementation of an Ultrafast X-Ray Imager with an XFEL Multi-Pulse Train to Measure Void Collapse during Laser Driven Shock Compression Daniel S Hodge, Arianna Gleason, Silvia Pandolfi, Yanwei Liu, Kenan Li, Anne Sakdinawat, Matthew H Seaberg, Philip Hart, Eric Galtier, Dimitri Khaghani, Bob Nagler, Haeja Lee, Eric Cunningham, Stefano Marchesini, Chandra Breanne Curry, Thomas Carver, Sharon L Vetter, Franz-Josef Decker, Cindy Bolme, Kyle J Ramos, Pawel M Kozlowski, David S Montgomery, Andrew Leong, Mathew Dayton, Leora E Dresselhaus-Marais, Suzanne J Ali, Jessica Shang, Kelin Kurzer-Ogul, Richard L Sandberg Characterizing the dynamic behavior of ablator materials with defects, such as micro-voids, is crucial in advancing nuclear fusion as a reliable energy source. At the Matter in Extreme Conditions (MEC) Instrument at the Linac Coherent Light Source (LCLS), we use a train of femtosecond x-ray pulses, separated by 2-3 nanoseconds, to study laser-shock compressed micro-voids embedded in polymer. We record 4 dynamic images utilizing an ultra-fast x-ray imaging (UXI) camera. Also, with single pulses, we seek quantitative characterization of the behavior of the shock-compressed void which requires phase retrieval and, subsequently, measurement of the areal density. |
Monday, July 11, 2022 4:15PM - 4:30PM |
F03.00004: Quantitative methods for studying shock-material behavior using x-ray phase contrast imaging Andrew Leong, Christopher M Romick, Tariq D Aslam, Cynthia A Bolme, David S Montgomery, Kyle J Ramos Synchrotron-based x-ray phase contrast imaging (XPCI) provides direct insight into the form and behavior of shock waves; however, extracting quantitative information from the images can be difficult because of image noise and the ill-posed problem of phase retrieval. We address these challenges by studying the shock-material interface behavior of polymers and energetic materials at oblique angles. Micron resolution XPCI images of gas gun-driven shock/detonation waves are recorded at the Dynamic Compression Sector, Advanced Photon Source. We present two techniques for recovering quantitative information about the shock wave: (a) a Monte Carlo-based technique and (b) an iterative-based phase retrieval. The Monte Carlo-based technique measures changes in mass density in the surrounding regions of the shock-material interface. Its accuracy is demonstrated with comparisons to shock-polar theory and detailed hydrodynamic simulations. The iterative-based phase retrieval technique reconstructs the mass density profile across the wave front. When demonstrated on PBX 9501, we found evidence of the heterogeneous microstructure interacting and shaping the wave front. These two techniques can be applied generally to studying and developing hydrodynamic models relating to shock physics. |
Monday, July 11, 2022 4:30PM - 4:45PM |
F03.00005: In-situ X-ray diffraction under shock loading: cristallographic study of Tin polymorphic transitions. Camille Chauvin, David Palma de Barros The purpose of this study is to collect experimental information about material undergoing phase transition under shock loading in order to improve current models and numerical simulations. However the comprehension of the mechanisms involved remains a great issue. Past studies have shown that macroscopic measurements on shocked materials do not provide enough information to fully understand the mechanism involved. |
Monday, July 11, 2022 4:45PM - 5:00PM |
F03.00006: Time-resolved Dark-field X-ray Microscopy Ishwor Poudyal, Zhi Qiao, Michael R Armstrong, Zahir Islam In the past decade, dark-field X-ray microscopy (DFXM), a full-field X-ray imaging technique, has emerged as a promising tool at synchrotron sources for mapping orientation, strain in deeply embedded structures. This technique has also been employed for studying in situ dynamic processes like dislocation motion as a function of temperature [1], structural transformation during phase transition in ferroelectric material [2], and so on. However, the pump-probe laser scheme incorporating the DFXM technique has not been reported yet. In this work, we demonstrate a time-resolved DFXM in the pump-probe scheme at Sector 6-IDC beamline using a 10-ns pulsed laser and the X-ray probe pulse obtained from the hybrid mode operation of the APS storage ring. We observe a thermal decay due to laser-induced heat diffusion in a Germanium single crystal which matches the theoretical prediction. The single pulse DFXM imaging in combination with the laser-pump X-ray probe method could reveal thermal strain formation and propagation of the acoustic wave “on-the-fly” generated by a laser-induced lattice deformation. This will open a new avenue of materials research on laser-induced dynamic phenomena in solids at sub-nanosecond time scales. |
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