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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Subterranean, Subcritical, & Superhuman: Seeing Explosions with X-Ray Vision
This report addresses the question, "How do we know that our nuclear weapons work?" through insight from a timeline of past practices, such as atmospheric detonation, up to subcritical experimentation and the use of x-ray technologies.
Collaborative Research: Explosive reconnection in relativistic magnetically-dominated plasmas
Magnetic fields can be the dominant component of astrophysical plasmas, so that the magnetic energy density might exceed even the rest-mass energy density of matter. In this extreme (and largely unexplored) regime the magnetic field controls the overall plasma evolution, dissipation, and acceleration of non-thermal particles. This plasma regime, applicable to a variety of astrophysical sources --- magnetars, pulsars and pulsar wind nebulae (PWNe), jets of Active Galactic Nuclei (AGNs) and Gamma-Ray Bursters (GRBs) --- is dramatically different from laboratory plasmas, the magnetospheres of planets, and the interplanetary plasma. Relativistic astrophysical sources then provide an unique opportunity to study the fundamental plasma physics of magnetically-dominated plasmas; a novel and quickly evolving field of theoretical research which, by investigating energy conversion and particle energization processes in plasmas, is of vital importance to the Fusion Energy Sciences DoE program.
LANL National Energetic & Engineering Weapons Campus (NEEWC): Overview of the LANL High Explosives Campus
Abstract not provided.
Airblast High Explosive Sensitivity Study
The ability to accurately simulate the flow produced inside the LANL blast tube is an important capability that is currently under development in W-13. This capability will be used to produce boundary conditions for structural simulations of blast tube tests. This capability could also be used to improve future blast tube test campaigns and inform future blast tube upgrades.
Controlling the explosion of a high-current-density conductor through the addition of micron-scale surface defects.
Abstract not provided.
Imaging Pyrometry and Optical Depth Measurements in Explosive Fireballs using High-Speed Imaging .
Abstract not provided.
Inferring Gas Flow and Fracture Network Damage After a Subsurface Detonation Using Explosive and Geogenic Noble Gases.
Abstract not provided.
Single-Station Backazimuth Estimations for Earthquake & Explosive Sources.
Abstract not provided.
NONLINEAR MULTI-PHENOMENOLOGY EXPLOSION MONITORING
Explore the source record for details and available documents.
The Force Explosion Condition Accurately Predicts Explodability of Core-Collapse Supernova Simulations [Slides]
We are testing the FEC with CCSN Simulations. We will continue to develop the theory. We will continue to develop the Multi-D Simulations.
Analysis of Explosion Data Collected from the Stratosphere
To be presented at the Consortium for Monitoring, Technology, and Verification Workshop 21 March 2023 https://mtv.engin.umich.edu/2023-mtv-workshop/
LLNL Macroscopic Anisotropic Explosives Research at INL National Security Test Range: Build Book
Abstract not provided.
Visualizing Non-Shock Impact Ignitions in High Explosives [Slides]
Abstract not provided.
Modeling particulate generation during high energy explosive events
Laser produced plasmas are used to simulate high energy events and are useful for a variety of applications e.g. in industrial sectors, such as semi-conductor manufacturing, as well as medical, environmental, and energy sectors. Particulate generation in laser produced plasmas is related to key features of the plasma: temperature and pressure evolution during plume expansion, plasma chemistry etc. Several uncertainties persist in relating initial high energy events (~microseconds) to particulate formation that happens as the plasma cools and evolves (~milliseconds).
Evolution of Two-Phase High Explosive Reactive Flow [Slides]
Reactive hydrodynamics involve rapid conversion of reactants to products along a detonation wave and needs a closure rule: P-T equilibrium. To calculate P-T equilibrium, we use a root finding method, which can be a computational bottleneck. We evolve the guess for the root finder rather than using the previous value to reduce iterations. Evolving products volume fraction Φ p for an initial root finding guess does reduce root finding iterations and seems to give the best results immediately following a detonation wave (reducing root finding iterations from 5 to 2).
High altitude balloon-borne acoustic detection of the October 2020 Large Surface Explosion Coupling Experiment (LSECE).
Abstract not provided.