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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"plasma simulation"”.
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Advancing hybrid fluid-kinetic methods for plasma simulation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
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Plasma simulation with a dielectric object in the presence of an ion flow
Recent dusty plasma experiments have investigated the crystallization of dust grains near the edge of a plasma sheath. Some theories were proposed to explain the crystallization mechanisms. The purpose of this simulation work is to study the electrostatics of a dielectric object immersed in a …
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Plasma confinement optimization of the versatile toroidal facility for ionospheric plasma simulation experiments
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1991.
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A Multigroup One-Dimensional Tokamak Fusion Plasma Simulation for Non-Maxwellian Ions Slowing Down in a Thermal Background
Made available in DSpace on 2017-07-06T18:55:22Z (GMT). No. of bitstreams: 3 Metzger_John_D_MS.pdf: 41206592 bytes, checksum: a0be3867681c02996506c2473d60f688 (MD5) Metzger_John_D_MS_ABS.pdf: 545248 bytes, checksum: 9c976cf6a227887c97014849b6ac438a (MD5) license.txt: 4813 bytes, checksum: …
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Using Machine Learning to Generate a Surrogate Model for Plasma-Surface Interactions
Plasma-surface interactions are an important effect in laboratory plasmas, but too complicatedto be modelled directly in plasma simulations. However, plasma surface interactions can be modelled by Transport and Range of Ions in Matter (TRIM) simulations based on a binary collision approximation of …
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A tuple space implementation for large-scale infrastructures
… a completely parallelizable one and a plasma simulation that is not completely parallelizable. Using this last application we have compared the performance of our service against MPI. Finally, we have developed and tested a simple workflow in order to show the versatility of our service.
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Discontinuous Galerkin modeling of plasma turbulence in a simple magnetized torus
Plasma turbulence in the Texas Helimak, a simple magnetized torus (SMT) experiment, has been simulated with fluid and gyrokinetic continuum models that employ the discontinuous Galerkin (DG) computational method. SMTs are physical approximations of a sheared cylinder and, with simple magnetic …
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Investigation of the GEM MPD thruster using the MACH2 magnetohydrodynamics code
This work investigated using the MACH2 plasma simulation code in replicating the results of previous experimental work on the gallium electromagnetic (GEM) thruster. MACH2 was also used to examine possible changes to the GEM thruster that could improve the performance of the actual thruster. …
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Fully kinetic modeling of a divergent cusped-field thruster
A fully kinetic, particle-in-cell plasma simulation tool has been incrementally developed by members of the Massachusetts Institute of Technology Space Propulsion Laboratory. Adapting this model to simulate the performance and plasma dynamics of a divergent cusped-field thruster is discussed. …
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Development of a Parallel Electrostatic PIC Code for Modeling Electric Propulsion
… of Coliseum, the Air Force Research Laboratory plasma simulation framework. The parallel code was designed to run large simulations on the world fastest supercomputers as well as home mode clusters. Plasma simulations are extremely computationally intensive as they require tracking millions of …
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Numerical simulation of stimulated electromagnetic emissions in the ionosphere
One-dimensional electrostatic plasma simulation using the particle-in-cell technique is used to study the spectral features of stimulated electromagnetic emission (SEE). SEE is a potential diagnostic tool to study the ionosphere and its spectrum provides a different view of the heated region from …
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Two-dimensional, Hydrodynamic Modeling of Electrothermal Plasma Discharges
… have been developed to model electrothermal (ET) plasma discharges. ET plasma discharges are capillary discharges that draw tens of kA of electric current. The current heats the plasma, and the plasma radiates energy to the capillary walls. The capillary walls ablate by melting and vaporizing and …
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Development of the DRACO ES-PIC code and Fully-Kinetic Simulation of Ion Beam Neutralization
This thesis describes development of the DRACO plasma simulation code. DRACO is an electro-static (ES) code which uses the particle-in-cell (PIC) formulation to track plasma particles through a computational domain, and operates within the Air Force COLISEUM framework. The particles are tracked on …
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Electron Temperature Enhancement Effects on Plasma Irregularities Associated with Charged Dust in the Earth's Mesosphere
… layer. To investigate the temporal behavior of plasma irregularities thought to produce PMSE, this work describes a new model that incorporates both finite diffusion time effects as well as dust charging. The hybrid model utilizes fluid ions described by continuity and momentum equations, …
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Supersonic Constricted Plasma Flows
… in space. A weakly ionised capacitively coupled plasma is ignited in the flowing Ar gas propellant within a constricted discharge chamber at 1 Torr using less than 10 W of radiofrequency power. The discharge can operate either continuously or in rapid pulsed mode since plasma breakdown initiates …
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Supersonic Constricted Plasma Flows
… in space. A weakly ionised capacitively coupled plasma is ignited in the flowing Ar gas propellant within a constricted discharge chamber at 1 Torr using less than 10 W of radiofrequency power. The discharge can operate either continuously or in rapid pulsed mode since plasma breakdown initiates …
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Weakly collisional electrostatic simulations for laboratory astrophysics applications
Modern plasma physics research is increasingly realizing the potential for cutting edge laser-produced plasma experiments to be exploited in order to investigate astrophysically relevant phenomena. Of particular interest are collisionless shocks, and the physics of the weakly collisional regime …
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Mikrowellenplasma-Simulation, Abscheidung und Charakterisierung von polykristallinen, dotierten und undotierten Diamantschichten
… Im Mittelpunkt des ersten Teils stehen Computersimulationen, die zur Optimierung und Neuentwicklung von Mikrowellen-Plasmareaktoren für die Niederdruck-Diamantabscheidung eingesetzt werden. Der zweite Themenkomplex befasst sich mit der Abscheidung und Charakterisierung bordotierter …
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Development of Magnetic Nozzle Simulations for Space Propulsion Applications
… of space propulsion using the channeling of plasma by a divergent magnetic field, referred to as a magnetic nozzle has been explored by a number of research groups. This research develops the capability to apply the high order accurate Runge-Kutta discontinuous Galerkin numerical method to …