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 B03: Dynamic Temperature Measurements IFocus Recordings Available
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Chair: Brian Jensen, Los Alamos National Laboratory Room: Anaheim Marriott Platinum 1 |
Monday, July 11, 2022 9:15AM - 9:45AM |
B03.00001: Advances in understanding shock temperature phenomena using pyrometric techniques Invited Speaker: Tom M Hartsfield Understanding temperature in dynamic compression experiments is an ongoing challenge in the field of shock physics. Measuring and interpreting Planck radiance is a first step toward knowledge of thermal phenomena under shock. However, the true precision of temperature measurements is only as great as our understanding of the underlying systems and the processes at play within them. This talk will briefly discuss pyrometric benchmarks and emissivity analysis techniques before focusing on the relationship between dynamic thermal interfaces and the underlying properties of the materials across them. We will describe application of these properties in recent results mapping Hugoniot states, identifying phase boundaries, and investigating more complex systems. In each case, experimental designs can avoid or address current areas of uncertainty in shock temperature measurement. |
Monday, July 11, 2022 9:45AM - 10:00AM |
B03.00002: Improving the Hugoniot Temperatures of Iron Through Measured and Modeled Thermo-Optical Properties Hannah Shelton, David A Brantley, Sebastien Hamel, Ryan S Crum, Hannah C Maxwell, Eric C Dutra, Minta C Akin For opaque samples in shock compression experiments bounded by a window, the interface between the sample and window can complicate optical methods of temperature determination. Additional considerations such as thermal conduction across the sample-window interface and materials properties differences between the Hugoniot and interface pressures of the sample need to be factored into the derived temperature. This compounds upon uncertainties already present in optical pyrometry methods, such as in sample emissivity and calibration reliability. To expand upon the temperature convergence behavior of iron across a Fe-LiF interface and to further reduce associated uncertainties, we have performed a series of gas gun compression experiments on iron up to 240 GPa utilizing discrete-wavelength pyrometry, streaked optical pyrometry, in situ reflectivity collection, and modeled emissivity behavior of the iron at equivalent temperatures and pressures. Our results show that incorporating wavelength, temperature, and time-resolved reflectivity information improves temperature fits and reduce derived Hugoniot temperature uncertainty. |
Monday, July 11, 2022 10:00AM - 10:15AM |
B03.00003: A Statistical Method of Nanosecond, Low-Temperature Optical Pyrometry for Dynamic Compression Experiments Xuchen Gong, Michelle C Marshall, Mary Kate Ginnane, Brian Henderson, Steven T Ivancic, Robert Boni, Ryan Rygg, Gilbert W Collins Dynamic compression experiments use streaked optical pyrometry to measure the temperature of heated materials due to compression, assuming they behave like black (or grey) bodies. For very low temperature targets (<5000 K), few photons are captured by a streak camera with a typical sweep time window (27 to 50 ns). The histogram of the resulting image resembles a slightly distorted Gaussian, very close to the Gaussian histogram of the background signal. A statistical method is developed to extract temperature information from such histograms and is applied to silicon ramp-compression experiments. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856. |
Monday, July 11, 2022 10:15AM - 10:30AM |
B03.00004: Pyrometry measurements on shocked samarium Dan Dolan, Richard Hacking, Sakun Duwal Temperature is an elusive property in dynamic compression research. Even with microscopic structure information, phase diagrams are difficult to interpret with only pressure and density measurements. Optical pyrometry, for all its faults, remains the best method for determining shock temperatures. Recent experiments with samarium demonstrate the progress and ongoing challenges of time-resolved pyrometry. |
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