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 C03: Dynamic Temperature Measurements IIFocus Recordings Available
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Chair: June Wicks, Johns Hopkins University Room: Anaheim Marriott Platinum 1 |
Monday, July 11, 2022 11:00AM - 11:30AM |
C03.00001: Development and Implementation of Broadband Optical Pyrometry on the UC Davis 2-Stage Gas Gun Invited Speaker: Dylan K Spaulding Characterization of the thermodynamic history of silicate minerals upon shock and release is critical for understanding and modeling planetary impact processes. Accurate equations of state, including off-Hugoniot states, require absolute temperature measurements to constrain phase boundaries and other properties that shape the outcomes of collisional processes. We have developed a suite of optical pyrometry tools that can be fielded simultaneously to observe broadband thermal emission over a wide temperature range. This includes a temporally and spectrally-resolved streaked spectrometer which operates between 350-850nm with ~nm spectral resolution and a six-channel visible/near-infrared pyrometry system extending from 650nm to 5000nm. Both systems are coupled to the sample via a single, custom fiber-optic probe, eliminating open optics and permitting a compact diagnostic footprint on the sample as well as portability of the system between our lab’s two light gas guns. In this presentation, we present details of the system’s construction, absolute calibration, and benchmark experiments on the melting curve of SiO2 and (Mg,Fe)2SiO4 hugoniot. |
Monday, July 11, 2022 11:30AM - 11:45AM |
C03.00002: Measurement of Temperature Profiles across Turbulent Combustion Layers in HE Fireballs Nick Glumac, Samuel Brunkow, Allen L Kuhl, H. K Springer We studied optical emissions from fireballs created by the detonation of 25-g hemispherical charges. The charge was mounted on a 4-inch diameter steel rod to absorb the high detonation pressures and initiated by a RP-80 ignitor. The rod was flush mounted on a PMMA plate. As the hemispherical fireball expanded, it could be photographed both from the side and from underneath. Fireball gases turbulently mix with air, forming a turbulent combustion layer near the outer edge of the fireball. This was visualized using framing-camera photography; the thermal distribution across the emission front was measured using imaging spectroscopy and 3-color pyrometry. Both conventional and additively manufactured explosive charges were studied. Hydrocode simulations were also performed with our high-order Godunov code; the Thermodynamics of the gases was specified by a tabulated version of the Cheetah code. Computed temperatures agreed with the experimental temperature profiles. LLNL-ABS-832882 |
Monday, July 11, 2022 11:45AM - 12:00PM |
C03.00003: EXAFS for probing thermal states of compressed materials at NIF Yuan Ping, H. Sio, Andrew Krygier, Dave Braun, Robert E Rudd, Stanimir Bonev, Gregory E Kemp, Marius Millot, Dayne E Fratanduono, Amy L Coleman, Federica Coppari, Nobuhiko Izumi, Stanislav Stoupin, Jon H Eggert, Hye-Sook Park, Marilyn B Schneider, James M McNaney, David K Bradley, Warren W Hsing, Neil Ose, Bernard Kozioziemski, Andy J Mackinnon, Lan Gao, Kenneth W Hill, Novimir A Pablant, Manfred L Bitter, Brian F Kraus, Philip C Efthimion
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Monday, July 11, 2022 12:00PM - 12:15PM |
C03.00004: Measurement of Cu temperature, density, and phase using Extended X-ray Absorption Fine Structure up to 1 TPa Hong W Sio, Yuan Ping, Andrew Krygier, David G Braun, Robert E Rudd, Stanimir Bonev, Gregory E Kemp, Marius Millot, Dayne E Fratanduono, Federica Coppari, Nobuhiko Izumi, Bernard Kozioziemski, Hye-Sook Park, Marilyn B Schneider, James M McNaney, David K Bradley, Andrew Mackinnon, Warren W Hsing, Jon H Eggert, Lan Gao, Kenneth W Hill, Philip C Efthimion The temperature of dynamically compressed materials is the largest uncertainty in modern equation of state modeling, and developing new tools to measure temperature is important to complement data from existing diffraction and equation-of-state platforms. In experiments performed at the National Ignition Facility (NIF), extended x-ray absorption fine structure (EXAFS) has been measured and used to constrain temperature, density, and phase in Cu up to 1 TPa. These fine-structure modulations in the x-ray absorption are caused by photoelectron scattering off nearby atoms, and are sensitive to both local atomic spacing and thermal disorder. Measured EXAFS signals are consistent with face-center-cubic structure in Cu up to 6,000K near 400 GPa, and also revealed an unexpected temperature sensitivity to the material layers adjacent to the Cu sample. |
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