A5083272307- Laser-Plasma Interactions and Diagnostics
- Membrane Separation Technologies
- Solar-Powered Water Purification Methods
- Pulsed Power Technology Applications
- Magnetic confinement fusion research
- Nanofluid Flow and Heat Transfer
- Membrane-based Ion Separation Techniques
- Groundwater flow and contamination studies
- Grouting, Rheology, and Soil Mechanics
- Irrigation Practices and Water Management
- Soil Management and Crop Yield
- Tree Root and Stability Studies
- Nuclear Physics and Applications
- Advanced X-ray Imaging Techniques
- Plasma Diagnostics and Applications
- Adsorption and Cooling Systems
- Hydraulic flow and structures
- Aerosol Filtration and Electrostatic Precipitation
- Urban Stormwater Management Solutions
- Geotechnical Engineering and Soil Stabilization
- Rocket and propulsion systems research
- Heat Transfer and Optimization
- Microbial Applications in Construction Materials
- Electrokinetic Soil Remediation Techniques
- Refrigeration and Air Conditioning Technologies
The University of Texas at San Antonio
2011-2025
Mississippi State University
2025
Sandia National Laboratories
2003-2024
Tarleton State University
2024
Thomas Jefferson University Hospital
2022
Forrest General Hospital
2022
Sandia National Laboratories California
1968-2015
The University of Texas at El Paso
2010
Kansas State University
2010
Soil and Water Conservation Society
2010
Pulsed power accelerators compress electrical energy in space and time to provide versatile experimental platforms for high density inertial confinement fusion science. The 80-TW “Z” pulsed facility at Sandia National Laboratories is the largest device world today. Z discharges up 22 MJ of stored its capacitor banks into a current pulse that rises 100 ns peaks as 30 MA low-inductance cylindrical targets. Considerable progress has been made over past 15 years use precision scientific tool....
We present observations for 20-MA wire-array z pinches of an extended wire ablation period 57%+/-3% the stagnation time array and non-thin-shell implosion trajectories. These experiments were performed with 20-mm-diam arrays used double- -pinch inertial confinement fusion [M. E. Cuneo, Phys. Rev. Lett. 88, 215004 (2002)] on Z accelerator [R. B. Spielman, Plasmas 5, 2105 (1998)]. This has smallest wire-wire gaps typically at 20 MA (209 microm ). The this indicates that two-dimensional (r-z)...
Advancements have been made in the diagnostic techniques to measure accurately total radiated x-ray yield and power from z-pinch implosion experiments at Z machine with high accuracy. The is capable of outputting 2 MJ 330 TW power, measuring these quantities imperative. We will describe work over past several years which include development new diagnostics, improvements existing implementation automated data analysis routines. A set on were conducted load configuration held constant. During...
Sandia has successfully integrated the capability to apply uniform, high magnetic fields (10-30 T) energy density experiments on Z facility. This system uses an 8-mF, 15-kV capacitor bank drive large-bore (5 cm diameter), high-inductance (1-3 mH) multi-turn, multi-layer electromagnets that slowly magnetize conductive targets used over several milliseconds (time peak field of 2-7 ms). was commissioned in February 2013 and been more than 30 up 10 T have produced exciting surprising physics...
Dams are often operated to facilitate downstream juvenile anadromous fish migration over the spillways, but such operation can cause high dissolved concentrations of oxygen and nitrogen that be harmful fish. The concentration total gas (TDG) in flow changes with distance spillway crest depends on geometric configuration hydraulic operating conditions. A model is presented simulates physical processes transfer goal having an accurate more widely applicable TDG for plunging discharges. Bubble...
The US government made significant investments in building reservoirs the 1950s and 1960s, changing much of rural environment United States. primary authorized use was flood control, but other uses were as well, including irrigation, public water supplies, navigation, hydropower, recreation. While many these larger built for a projected life 150 to 200 years, it is now that, many, that will be cut short by 50 100 years due sedimentation, nutrient loading, associated eutrophication....
A comprehensive gas puff capability is being developed on the Z pulsed power generator. We describe methodology employed for developing a load Z, which combines characterization and modeling of neutral mass flow from supersonic nozzle, numerical implosion this profile, experimental evaluation these magnetic implosions Z. are beginning multiyear science program to study z-pinch physics at high current, starting with an 8-cm diameter double-shell delivers column Ar that imploded by machine's...
X-ray backlighting systems are being developed to diagnose z-pinch, inertial confinement fusion capsule, and complex hydrodynamics experiments on the 20 MA Sandia Z machine. The x-ray backlighter source is a laser-produced plasma created using Z-Beamlet laser, 2 TW, kJ Nd:glass laser recently constructed at Sandia. As an alternative point-projection radiography, we investigating different geometry [S. A. Pikuz et al., Rev. Sci. Instrum. 68, 740 (1997)] that uses spherically bent crystal...
Experiments were conducted with graphene nanoplatelets (GNP) to investigate the relative benefit of thermal conductivity increase in relationship potential detriment increased viscosity. The maximum enhancement ratio for GNP nanofluid over water was determined be 1.43 at a volume fraction 0.014. Based on aspect ratios, differential effective medium model is shown describe experimental results this study when using fitted interfacial resistance value 6 × 10−8 m2 K W−1. viscosity Einstein...
This study focused on monitoring hydrogen sulphide (dissolved and atmospheric) generation wastewater volumetric flow in a 21.4 km sewer line of the City San Antonio, Texas. The results were used to evaluate daily seasonal trends atmospheric dissolved sulphide, better apply control using ferrous sulphate prevent odour pipe deterioration. As part this study, evaluation cost-effective dosing strategy with was performed contents wastewater. Dosing studies laboratory find required ratio for...
High-elevation red spruce [Picea rubens Sarg.]-Fraser fir [Abies fraseri (Pursh.) Poir] forests in the Southern Appalachians currently receive large nitrogen (N) inputs via atmospheric deposition (30 kg N ha(-1) year(-1)) but have limited retention capacity due to a combination of stand age, heavy mortality caused by exotic insect infestations, and numerous gaps windfalls ice storms. This study examined magnitude timing fluxes into, through, out small, first-order catchment Great Smoky...
Tests are ongoing to conduct ∼20 MA z-pinch implosions on the Z accelerator at Sandia National Laboratory using Ar, Kr, and D2 gas puffs as imploding loads. The relatively high cost of operations a machine this scale imposes stringent requirements functionality, reliability, safety puff hardware. Here we describe development prototype system including multiple-shell nozzles, electromagnetic drivers for each nozzle's valve, UV pre-ionizer, an inductive isolator isolate ∼2.4 MV voltage pulse...
This research investigates the use of polymer-infused roots for soil-improvement applications. By infusing polymer through easily accessible above-surface plant stems, can be created without subsurface excavations. Evaluation this technique involves identifying improvements from by measuring in situ shear strength soil using a vane apparatus and tensile split-tension tests laboratory. Roots Ruellia squarrosa Artemisia annua plants were infused with mixture epoxy resin polyoxyalkylamine blend...
A new Wolter x-ray imager has been developed for the Z machine to study emission of warm (>15 keV) sources. optic adapted from observational astronomy and medical imaging, which uses curved mirrors form a 2D image source with 5 × mm3 field-of-view measured 60-300-μm resolution on-axis. The consist multilayer that create narrow bandpass around Mo Kα lines at 17.5 keV. We provide an overview instrument design imaging performance. In addition, we present first data wire array z-pinch on...