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Femtosecond/picosecond rotational coherent anti-Stokes Raman scattering thermometry in the exhaust of a rotating detonation combustor
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Flow and performance analysis of a natural gas-air rotating detonation engine with high-speed velocimetry
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Hot-spot initiated burn waves in heterogeneous-explosive detonation reaction zones: Mixed-mode reaction and the reactive-thermal wave model
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Experimental study of internal flow structures in cylindrical rotating detonation engines
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Curvature effect on stabilization of cellular detonations in channel, circular arc and spherical shell geometries
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Large-Scale Analysis on Accelerated Aging of Pentaerythritol Tetranitrate (PETN) Powders in Detonators
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Characterization of volcanic tuff pores pre- and post-underground nuclear detonation using ultra-small and small angle neutron scattering
The ability to accurately model the subsurface transport of radionuclides is fundamental to the remote detection and characterization of underground nuclear explosion (UNE) events. Developing more sophisticated transport models presents a significant opportunity to enhance monitoring capabilities, particularly in the reliable prediction of signature migration. Experimentally determined characterization of geologic materials associated with transport properties is the pertinent base information for such robust model development and calibration. Here, we report results from an unprecedented study demonstrating changes to the pore and fracture network structures in geological materials in response to UNEs over nanometer to micrometer length scales. Volcanic tuffs of five different lithological formations from pre- and post-UNE environments were collected from the Nevada National Security Site. Combined ultra-small and small-angle neutron scattering techniques were used to characterize the tuff pore structure. The results demonstrate measurable differences in the specific surface area and porosity of samples pre- and post-shot from texturally similar lithological formations, indicating that pore properties can serve as a direct physical signature of a UNE. The results also provide experimentally determined transport parameters in support of advanced model development through the integration of gas migration, hydrodynamic simulations, and geologic framework models.
Rapid isotopic analysis of uranium, plutonium, and americium in post-detonation debris simulants by RIMS
Uranium interference is a major problem in conventional 238 Pu analysis. In RIMS, a slight detuning of the resonance laser extinguishes the Pu signal so that the 238 U interference can be accurately quantified and subtracted.
Estimation of Optical Channel Signal Loss Following a Near-Surface Nuclear Detonation
We estimate the loss penalty for a free-space, ground to low earth orbit optical communications channel due to lofted atmospheric debris following a nuclear weapon explosion. These losses were estimated over time and compared to other loss sources like clouds and wildfire haze.
Effects of Void Morphology on Detonation Initiation of PBX 9502 [Slides]
This thesis defense covers Background/Motivation, High-Temperature SDT Measurements of PBX 9502, Neutron Scattering Measurements of PBX 9502, Reactive Burn Modeling of PBX 9502 Using SURF, Conclusion, and Future Work.
Advanced Analysis of Plutonium: Pre- and Post-Detonation Scenarios
A Dissertation Presented for the Doctor of Philosophy Degree in Nuclear Engineering. Overarching research question: Do nuclear reactions in surface environment lead to distinctive chemical and isotopic signatures that are not present in nature? Testable hypothesis: Nuclear processes will lead to distinctive chemical and isotopic patterns of partitioning because high-temperature processes under high radiation rarely occur in natural surface environment.
A Cursory Introduction to Detonation Physics: Brief snippets & examples [Slides]
Abstract not provided.