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 M03: Velocimetry and RangingRecordings Available
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Chair: Philip Rae, Los Alamos National Laboratory Room: Anaheim Marriott Platinum 1 |
Tuesday, July 12, 2022 4:00PM - 4:15PM |
M03.00001: Estimating Uncertainty in BLR and PDV Analysis Michelle Rhodes Uncertainty is an important part of experimental measurements, and the uncertainties associated with time-frequency analysis can be difficult to unravel. We review previous work in this area and extend those results to produce specific and reliable estimates of uncertainty arising within the analysis of PDV and BLR data. We take into account factors such as windowing functions and amplitude modulation and create an expression that could be incorporated into analysis codes for point-by-point uncertainty estimates. |
Tuesday, July 12, 2022 4:15PM - 4:30PM |
M03.00002: Performance of momentum diagnostics when impinged with a high-speed jet of explosive products Kyle Hughes, Noah W Birge, Patrick W Younk Characterization of jets of high explosive products is challenging. To work towards their measurement, a series of small-scale experiments was performed at Los Alamos National Laboratory to examine the performance of momentum diagnostics when impinged with a high-speed jet of explosive products. The experiments were driven by a 12.7 mm x 12.7 mm pellet of PBX-9501 initiated by an RP-1 detonator. Directly in contact with the high explosive was a 40 mm x 3 mm metal disk with an 800 μm hole located in the center. Upon detonation, this hole resulted in a high speed jet with a velocity of approximately 7 km/s. Several metals were investigated, including brass and tin, to determine the ability of the momentum diagnostics to detect ejecta while being subjected to the jet. A photonic Doppler velocimetry (PDV) probe was located directly in the path of the jet. Arrayed around the central PDV probe, were additional PDV probes and other momentum diagnostics such as piezo-pins and assay foils. Additionally, the jet was characterized by high-speed imaging and X-ray radiography. Results show that while the central PDV probe was destroyed by the jet on impact, neighboring probes survived the high-speed shock. The neighboring probes penetrated the explosive products and interrogated the surface of interest, even though they were separated by only a few millimeters from the central probe. |
Tuesday, July 12, 2022 4:30PM - 4:45PM |
M03.00003: Triboluminescent Probes for Determining Shock Arrival Time in Metal Emma D Rudziensky, Brandon White, Jeremy Danielson, George Rodriguez, Sean Apgar, Brian Cata, Ruben Manzanares, Louie Chacon, Brandon M LaLone Crushing, abrasion, and other mechanical deformation of solid materials can produce light: a phenomenon known as triboluminescence. This phenomenon was recently exploited to create a simple yet novel diagnostic for measuring the time of arrival of a shock front at a specific depth in a metal target. Two potential probe designs were built at Los Alamos National Laboratory, each using a different material as the triboluminescent agent. Both were tested at the Special Technologies Laboratory in Santa Barbara, CA in January 2022. The probes were embedded in an aluminum target and impacted with a tantalum flyer moving near 2.5 km/s, resulting in a shock speed and pressure of approximately 8 km/s and 40 GPa (respectively) in the aluminum. This talk will report results from the 5-shot campaign and consider whether this diagnostic approach could reduce the cost or complexity of determining time of arrival in future subcritical experiments. |
Tuesday, July 12, 2022 4:45PM - 5:00PM |
M03.00004: Comparison Of Velocimetry and Reflectometry To Investigate Time of Arrival Diagnostic (TOAD) Probe Function Jonathan A Hudston, Jeremy R Payton, Emma D Rudziensky, Brandon M LaLone, Ben Valencia, Brian Cata, Ruben Manzanares, Louie Chacon, Jeremy Danielson As a diagnostic, time of arrival may be viewed as any method to record shockwave or detonation front arrival with temporal accuracy. Common methods include electrical foils, piezoelectric pins, and shorting pins; all of which are electrically based. The Time of Arrival Diagnostic (TOAD) developed at the Los Alamos National Laboratory (LANL) is a fiber optic analog to piezoelectric pins. It has become a commonly fielded shock physics diagnostic at LANL. It is simple, low cost, and has inherent safety near high explosives. Occasionally, TOAD data is observed to have more than one inflection, which may obscure the shock arrival. A series of controlled experiments were conducted to better understand the shock loading process at the TOAD probe. The experiments consisted of a stationary aluminum target with imbedded TOAD probes that were impacted with tantalum flyer plate. These experiments were performed at the powder gun facility at the Special Technologies Laboratory (Mission Support and Test Services) in Santa Barbara, CA. By diverting a portion of the TOAD signal to a Photon Doppler Velocimetry system, a comparison between the two optical diagnostics was conducted. The results of these experiments will be discussed in this talk. |
Tuesday, July 12, 2022 5:00PM - 5:15PM |
M03.00005: Comparing Existing and Novel Diagnostics for Determining Shock Arrival Time in Metal Brandon R White, Jeremy R Danielson, Emma D Rudziensky Here we compare the performance of four diagnostics that can be used to determine the time of arrival of a shock wave in metal. These are the well-established TOAD (Time of Arrival Diagnostic) and PDV (Photon Doppler Velocimetry) probes of the types, as well as two novel probe types designed to indicate shock arrival by detecting triboluminescence in materials at their tips. All probes were built at Los Alamos National Laboratory and tested at the Special Technologies Laboratory in Santa Barbara, CA in January 2022. The probes were embedded in aluminum targets and impacted via with a tantalum flyer at a velocity of 2.5 km/s. The resulting shock speeds and pressures were approximately 8 km/s and approximately 40 GPa, respectively. This talk will report results from the 5-shot campaign and evaluate the merits of each probe type, culminating in recommendations for future subcritical and hydrodynamic experiments. |
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