A5057861063- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Ionosphere and magnetosphere dynamics
- Laser-induced spectroscopy and plasma
- Lightning and Electromagnetic Phenomena
- Astro and Planetary Science
- Gyrotron and Vacuum Electronics Research
- Laser-Plasma Interactions and Diagnostics
- High voltage insulation and dielectric phenomena
- Power Line Communications and Noise
- Fusion materials and technologies
- Solar and Space Plasma Dynamics
- Atomic and Molecular Physics
- Model Reduction and Neural Networks
- Gas Dynamics and Kinetic Theory
- Real-time simulation and control systems
- Nuclear reactor physics and engineering
- Power System Optimization and Stability
- Electromagnetic Compatibility and Noise Suppression
- Pulsed Power Technology Applications
- Diamond and Carbon-based Materials Research
- Electrical Fault Detection and Protection
- Plasma and Flow Control in Aerodynamics
Oak Ridge National Laboratory
2017-2020
Fomento de Construcciones y Contratas (Spain)
2020
Electric Power Research Institute
2012-2015
University of Houston - Clear Lake
2012
Johnson Space Center
2002-2004
Istituto Nazionale di Fisica Nucleare, Sezione di Genova
2003
National Aeronautics and Space Administration
2003
Lawrence Livermore National Laboratory
1995-2003
Science Applications International Corporation (United States)
1999
Ansaldo (Italy)
1991
A three-dimensional magnetohydrodynamic model of the global solar corona is described. The uses observed photospheric magnetic fields as a boundary condition. version with polytropic energy equation used to interpret observations, including eclipse images corona, Ulysses spacecraft measurements interplanetary field, and coronal hole boundaries from Kitt Peak He 10 830 Å maps extreme ultraviolet Solar Heliospheric Observatory. Observed are condition evolution during period February 1997–March...
An electro-optic, solid-state electric field sensor system for noncontact detection of energized objects at power frequency (60 Hz) was investigated. In laboratory testing, the found to have a minimum detectable amplitude 4 mV/m/Hz <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1/2</sup> , which further reduced by factor 2 through vector averaging over 20 cycles. an experimental setup emulating realistic scenario conducting structure (such as...
Detachment of the plasma exhaust is an essential element a magnetic nozzle operation that requires experimental, analytic and computer simulation studies. The present work devoted to simulations detachment in Variable Specific Impulse Magnetoplasma Rocket. Both particle MHD methods have been used results are reported this paper.
A simple model for coupling of an electromagnetic plane wave incident on a conductor above ground has been developed using reciprocity theory, providing some advantages as compared to the conventional transmission line approach. The is semi-infinitely long single lossy and connected by arbitrary load impedance vertical grounding conductor. This configuration corresponds worst-case coupling, because it leads induced current larger than in cases finite multiconductor lines. frequency-domain...
Critical Infrastructure Systems such as transportation, water and power grid systems are vital to our national security, economy, public safety. Recent events, like the 2012 hurricane Sandy, show how interdependencies among different CI networks lead catastrophic failures whole system. Hence, analyzing these networks, modeling failure cascades on them becomes a very important problem. However, traditional models either do not take multiple CIs or dynamics of system into account, model it...
A high-altitude electromagnetic pulse (HEMP) may pose a significant threat to the electrical power grid. In this context, present study considers potential impact of HEMP early-time component (E1) on winding typical transmission line transformer. time-domain, fully electromagnetic, three-dimensional, finite-element model was used simulate propagation an E1-induced voltage surge into transformer winding. The analysis is focused first few turns winding, ones that are impacted by largest...
Abstract The coupled core‐edge nonlinear transport code CORSICA 2 is introduced and the structure of its iterative coupling algorithm briefly discussed. Selected application results are reported that reproduce equilibria in DIII‐D discharges with plasma profiles initialized from experimental data. Simulations for an L‐H transition a gas puffing experiment plasmas presented.
The Variable Specific Impulse Magnetoplasma Rocket (VASIMR) engine concept is an RF-powered thruster scaleable to multi-megawatt power levels. prototype at the Johnson Space Center consists of a helicon plasma source, ion cyclotron resonant heating system, and magnetic nozzle. Theoretical computational predictions system's effectiveness have been validated by experimental results presented here. At modest levels, has demonstrated continuously variable specific impulse spanning range 5,000 -...
A Particle-in-cell simulation model has been developed to study the physics of Traveling Wave Direct Energy Converter (TWDEC) applied conversion charged fusion products into electricity. In this availability a beam collimated is assumed; focused on kinetic energy alternating current (AC) electric power. The electrostatic, as electro-dynamics relatively slow ions can be treated in quasistatic approximation. two-dimensional, axisymmetric (radial-axial coordinates) geometry considered. Ion...
The increasing complexity of power system has made it difficult to simulate large-scale in detail. Therefore, improve computational efficiency, model reduction techniques been applied reduce the external area and focus on dynamics internal area. This paper proposes a measurement-based method which reduces by replacing with ARX equivalents. modeled transfer function parameters are obtained using identification approach. Case studies NPCC EI carried out. Results show that proposed can...
Computational models of the Traveling Wave Direct Energy Converter (TWDEC) have been developed with goals of: demonstrating physics charged particle deceleration and energy conversion, supporting development an experimental TWDEC test article, optimizing its performance. The first model is a 2D axisymmetric, electrostatic, particle-in-cell (PIC) simulation which includes presence electrodes external circuit load impedance. second based on analytical approach, modeling ion bunches as point...
A coordinated experimental and theory/simulation effort has been carried out to investigate the physics of Traveling Wave Direct Energy Converter (TWDEC), a scheme that proposed in past for direct conversion into electricity kinetic energy an ion beam generated from fusion reactions. This focused particular on TWDEC process high density regime, thus accounting expansion due its space charge.
In a plasma-electrode Pockels cell (PEPC), plasma discharges serve as transparent electrodes on each side of an electro-optic crystal such KDP. These plasmas facilitate rapid and uniform charging discharging the crystal. We describe PEPC technology deployed Beamlet envisioned for National Ignition Facility. Performance is discussed in detail. also discuss models which have shed light operation. both high-voltage sheath that forms near surface characteristics bulk column.