A5101444721- Energetic Materials and Combustion
- Combustion and Detonation Processes
- High-Velocity Impact and Material Behavior
- Laser-Plasma Interactions and Diagnostics
- Electromagnetic Launch and Propulsion Technology
- Structural Response to Dynamic Loads
- Particle accelerators and beam dynamics
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Risk and Safety Analysis
- Radiation Detection and Scintillator Technologies
- Gyrotron and Vacuum Electronics Research
- Geophysics and Sensor Technology
- Fluid Dynamics Simulations and Interactions
- Laser-induced spectroscopy and plasma
- Particle Dynamics in Fluid Flows
- Transportation Safety and Impact Analysis
- Electrostatic Discharge in Electronics
- Advanced Surface Polishing Techniques
- Ion-surface interactions and analysis
- Computational Fluid Dynamics and Aerodynamics
- Fluid Dynamics and Turbulent Flows
- Spectroscopy Techniques in Biomedical and Chemical Research
- Numerical methods in engineering
- Electrohydrodynamics and Fluid Dynamics
Los Alamos National Laboratory
2009-2020
Lawrence Livermore National Laboratory
1981-2012
Arizona State University
2007-2009
Massachusetts Institute of Technology
2007-2009
Los Alamos National Security (United States)
2009
Brigham Young University
2007
University of Illinois Urbana-Champaign
2005
Swarthmore College
1997
Lawrence Livermore National Security
1993
PPL (United States)
1991
This paper considers the optimization of complex multi-parameter systems in which objective function is not known explicitly, and can only be evaluated either through costly physical experiments or computationally intensive numerical simulation. Furthermore, interest may contain many local extrema. Given a data set consisting value at scattered parameter values, we are interested developing response surface model to reduce dramatically required computation time for runs.To accomplish these...
At Lawrence Livermore National Laboratory we have developed a coupled helical-coaxial FCG device called the Full Function Test (FFT). This was used to deliver 98 MA of current and 66 MJ energy an inductive load. The successful testing FFT represented culmination effort establish high-energy pulsed power program that would greatly exceed performance capacitor bank facilities. Using modeling, design, experimental capabilities for FFT, new generator, Mini-G. Based upon half-scaling device,...
Preliminary experiments are performed to assess the utility of using shock wave image framing technique (SWIFT) characterize high explosive (HE) performance on detonator length and time scales. Columns XTX 8004, an extrudable RDX-based explosive, cured directly within polymethylmethacrylate (PMMA) dynamic witness plates, SWIFT is employed visualize waves driven into PMMA through detonation interaction. Current investigate two-dimensional, axisymmetric test geometries that resemble historic...
An empirical model equation for shock-pressure decay in PMMA was determined through a unique set of experiments employing detonator loading. Custom polymethyl methacrylate (PMMA) witness blocks were designed with monolithic architecture to house precise gaps thicknesses ranging from 0-10 mm nominal increments 1 mm. The separated working surfaces windowed photonic Doppler velocimetry (PDV) probes, and provide undistorted optical access ultra-high-speed framing digital-streak cameras. shock...
Detonator output directed into both ambient air and polymethylmethacrylate (PMMA) windows is simultaneously investigated using ultra-high speed, time-resolved imaging photonic Doppler velocimetry (PDV) measurements. In air, one-dimensional measurements of detonator cup position are made from timeresolved image sequences compared to time-integrated velocity curves obtained the PDV data. The results demonstrate good agreement that validates two methods concurrently measure motion free-surface....
Several experiments will be presented that are part of a phased plan to understand the evolution detonation in detonator from initiation shock through run detonation, full transition, booster and detonation. High‐speed multiframe schlieren imagery has been used study several explosive events, such as exploding bridgewires (EBWs), foil initiators (EFIs or "slappers"), direct optical (DOI), electrostatic discharge. Additionally, series tests performed on "cut‐back" detonators with varying...
Abstract A novel experiment developed for researching the initial collapse of an aluminum shaped charge liner was designed, executed, and validated. The evolved from need to recover shocked material enable analysis relationships between microstructure early behavior. research required that had been shocked, yet sufficiently intact allow metallurgical examination. Additionally, designed replicate unique shock loading liners. Practically, be inexpensive perform. paper describes experimental...
High-Speed Multi-Frame Laser Schlieren is used for visualization of a range explosive and non-explosive events. well-known technique visualizing shock phenomena in transparent media. backlighting framing camera allow images with very short (down to 5 ns) exposure times, band pass filtering block out self-light, 14 frames single event. This diagnostic has been applied several initiation events, such as exploding bridgewires (EBW), Exploding Foil Initiators (EFI) (or slappers), Direct Optical...