A5053428537- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Ion-surface interactions and analysis
- Graphene research and applications
- Gas Dynamics and Kinetic Theory
- Electromagnetic Simulation and Numerical Methods
- Diamond and Carbon-based Materials Research
- Laser Design and Applications
- Electrohydrodynamics and Fluid Dynamics
- Nanopore and Nanochannel Transport Studies
- Microfluidic and Bio-sensing Technologies
- Ionosphere and magnetosphere dynamics
- Dust and Plasma Wave Phenomena
- Surface Modification and Superhydrophobicity
- Atomic and Subatomic Physics Research
- Radiation Effects in Electronics
- Atomic and Molecular Physics
- Plasma Applications and Diagnostics
Tech-X Corporation (United States)
2018-2020
Michigan State University
2018
Worcester Polytechnic Institute
2002-2009
A 3D particle in cell/direct simulation Monte Carlo (PIC/DSMC) code is developed using unstructured tetrahedral grids with adaptation. The grid generation methodology, adaptation, charged-particle transport, field solver and particle/force weighting methodologies are reviewed. numerical used to simulate a emission array cathode operating an environment induced by Hall thruster. electron includes cold (0.1 eV) hot (5 electrons emitted 5-eV background plasma. simulations show the formation of...
Many emerging applications of high-power microwave sources require operation at new and higher frequencies. Computer modeling is the main tool for design optimization these sources, such as magnetrons. However, when designing a source, parameter space to scan can be too large study with traditional techniques. We apply machine learning (ML) (supervised in particular) search this automatically. demonstrate technique by optimizing magnetron 4 GHz, investigating selected parameters tradeoff...
A three-dimensional particle in cell/direct simulation Monte Carlo (PIC/DSMC) code is developed on unstructured tetrahedral grids with adaptation. Zero and linear weighting force interpolation schemes are incorporated. Collisions include neutral-neutral neutral-ion via the non-time-counter method. parametric investigation of numerical heating 3-D PIC simulations performed. The methodology applied to flow inside segmented microchannel a directional-Retarding Potential Analyzer. Simulations...
The Naval Research Laboratory's Hawk pulsed power generator is being used to drive a dense plasma focus (DPF) in order study the phenomenon of charged particle acceleration imploding plasmas. fast rise time, 1.2 μS, and high inductance, 607 nH, 220 kJ, 0.65 MA peak current Marx are unusual compared typical DPF driver parameters. In addition electrical parameters, local or gas injection initialize DPF, rather than more traditional static fill gas. A suite diagnostics development benchmark...
Charged particle acceleration has been investigated in a dense plasma focus (DPF) driven by the Hawk pulsed-power generator at Naval Research Laboratory. Neutron yields of over <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$5.0\times 10^{10}$</tex> have measured peak current xmlns:xlink="http://www.w3.org/1999/xlink">$\mathrm{I}=670\text{kA}$</tex> ) significantly above yield expected this based on purely I <sup...
We perform 2D simulations of the plasma dynamics in a series conditions, including as examples magnetic nozzle and reconnection. use fluid modeling framework USim [1] kinetic code VSim [2], we compare with results from WARPX [3] University Washington. present an analytic designed to identify regions computational domain where description is incomplete such treatment should be used. also check accuracy based by imposing limits on simulation parameters minimize unphysical effects like...
We compare MHD simulation results to experimental measurements taken from a dense plasma focus driven by the HAWK pulsed-power generator (0.65 MA peak current, <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$1.2\mu \mathrm{s}$</tex> rise time). USim is 3D capable, fluid modeling framework that simulates dynamics of charged fluids using two temperature equations, among others. The DPF device modeled an unstructured mesh, and initial conditions...
It is well-known that high-power electromagnetic devices require a kinetic treatment, especially for saturation of the device at peak power operation. What less clear capability higher order moment fluid code formulations to capture evolution saturated state, and in particular what physics lost as we include ever high moments. This question intriguing when consider vast majority analytic vacuum electronics rely on cold theory. In this initial work, use both particle-in-cell (WARP VSIM)...
Summary form only given. A three-dimensional PIC/DSMC numerical code is used to study a charge-exchange (CEX) ion backflow from Field-Emission-Electric-Propulsion (FEEP) thruster. Contamination CEX ions generated in the plume can be an important issue spacecraft propulsion system operation. The effect of neutralizer on back-flow current analyzed. results are compared with previous simulations. for FEEP plumes simulations developed unstructured tetrahedral grids. Neutral particles simulated...