Global ETD Search
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 45 for “"Particle-in-Cell (PIC)"”.
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Response Of Plasma Facing Components In Tokamaks Due To Intense Energy Deposition Using Particle-In-Cell(pic) Methods
<p>Damage to plasma-facing components (PFC) due to various plasma instabilities is still a major concern for the successful development of fusion energy and represents a significant research obstacle in the community. It is of great importance to fully understand the behavior and lifetime …
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Study of Multi-Electron Ionization and Charge Exchange in HIBF
In addition to the study of atomic effects for HIBF, plasma dynamics in a low-energy radio frequency (RF) discharge is studied through the implementation of a new Monte Carlo Collision (MCC) module developed for including into a Particle-In-Cell (PIC) package, The MCC module uses available cross …
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Implementation and performance evaluation of a GPU particle-in-cell code
In this thesis, I designed and implemented a particle-in-cell (PIC) code on a graphical processing unit (GPU) using NVIDA's Compute Unified Architecture (CUDA). The massively parallel nature of computing on a GPU nessecitated the development of new methods for various steps of the PIC method. I …
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3D ICEPIC simulations of pulsed relativistic magnetron with transparent cathode : a comparative study with 3D MAGIC simulations
Ongoing research at the University of New Mexico (UNM) shows significant improvement in the start time and rate of build-up of microwave oscillations in a relativistic magnetron that uses a transparent cathode. In recent studies conducted at UNM the experimental results and the results of numerical …
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Modeling the formation of current sheets in symmetric and asymmetric reconnection
In this thesis we investigate the nature of magnetic reconnection using analytic and numerical methods. We consider configurations which are symmetric across the reconnection layer relevant to the Earth magnetotail, as well as configurations asymmetric in density and temperature across the …
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Fully kinetic numerical modeling of a plasma thruster
… channel walls was numerically modeled using 2D3V Particle-in-Cell (PIC) and Monte-Carlo Collision (MCC) methodolo- gies. Electron, ion, and neutral dynamics were treated kinetically on the electron time scale to study transport, instabilities, and the electron energy distribution …
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Numerical Simulation of Ion Waves in Dusty Plasmas
There has been a great deal of interest in investigating numerous unique types of electrostatic and electromagnetic waves and instabilities in dusty plasmas. Dusty plasmas are characterized by the presence of micrometer or submicrometer size dust grains immersed in a partially or fully ionized …
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"Smoking-Gun" Observables of Magnetic Reconnection: Spatiotemporal Evolution of Electron Characteristics Throughout the Diffusion Region
<p>How does magnetic reconnection happen in a collisionless plasma? Knowledge of electron-scale dynamics is necessary to answer this outstanding question of plasma physics. Based on fully kinetic particle-in-cell (PIC) simulations of symmetric reconnection, the spatiotemporal evolution of velocity …
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Fully-kinetic PIC simulations for Hall-effect thrusters
In recent years, many groups have numerically modeled the near-anode region of a Hall thruster in attempts to better understand the associated physics of thruster operation. Originally, simulations assumed a continuum approximation for electrons and used magnetohydrodynamic fluid equations to model …
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Advances in fully-kinetic PIC simulations of near-vacuum Hall thruster and other plasma systems
In recent years, many groups have numerically modeled the near-anode region of a Hall thruster in attempts to better understand the associated physics of thruster operation. Originally, simulations assumed a continuum approximation for electrons and used magnetohydrodynamic fluid equations to model …
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Hybrid-PIC modeling and electrostatic probe survey of Hall thrusters
In order to study the physics of the acceleration process in Hall thrusters, an evolved hybrid particle-in-cell (PIC) numerical model was developed. A set of quasi-one-dimensional fluid equations are used for electrons, and a particle-tracking Boltzmann solver is used for the heavy species. The two …
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Numerical study of current collection by an orbiting bare tether
An electrodynamic (ED) Tether is a long thin conductive string deployed from a spacecraft. A part of the ED tether near one end is rendered positive with respect to the ambient plasma. This positive potential is maintained by the motion-induced Electromotive Force (EMF) or by the power supply, …
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HIGH EFFICIENCY AXIAL DIFFRACTION OUTPUT SCHEMES FOR THE A6 RELATIVISTIC MAGNETRON
… efficient vacuum diode-driven sources. MAGIC particle-in-cell (PIC) computer simulations have shown that the performance of the well-known A6 relativistic magnetron with radial power extraction through one or more of its cavities can be improved by instead using axial power extraction through …
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CHAOS: A multi-GPU PIC-DSMC solver for modeling gas and plasma flows
Numerical modeling of gas and plasma-surface interactions is critical to understanding the complex kinetic processes that dominate the extreme environments of planetary entry and in-space propulsion. However, simulations of these systems that evolve over multiple length- and time-scales is …
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Kinetic electron phenomena in dense magnetized plasma wakes
… past an obstacle by dense magnetized plasma, having both Debye-length and gyroradii smaller than the obstacle, is explored using particle-in-cell (PIC) simulations. These simulations are relevant to a wide range of physical settings, ranging from the moon in the (supersonic) solar wind to Mach …
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Collisionless ion collection by a sphere in a weakly magnetized plasma
The interaction between a probe and a plasma has been studied since the 1920s and the pioneering work of Mott-Smith and Langmuir [1], and is still today an active topic of experimental and theoretical research. Indeed an understanding of the current collection process by an electrode is relevant to …
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Numerical models for the simulation of Raman amplification in plasma
Raman amplification in plasma is a potential method of producing ultra-short, ultra-intense laser pulses. As amplification in realistic systems involves many competing nonlinear processes, numerical simulations are often used to better understand the associated complex behaviour. Different models …
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Fully kinetic particle-in-cell simulations of plasma-surface-dust interactions for lunar exploration
<p>"The studies involving lunar surface explorations have drawn attentions in recent years. A better understanding of possible potential hazards to astronauts and electronic equipment has become a necessity for future lunar explorations. The lunar surface, lacking an atmosphere and global magnetic …
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Two dimensional particle-in-cell simulation model for Hall type thrusters
In this master's thesis, a two-dimensional model of a Hall type thruster, was developed, to include secondary electron emission at the wall, ion recombination at the wall, diffuse reflection for neutrals bouncing off of the wall, wall potential calculation based on the collected wall charge and a …
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Characterization of short-pulse laser-produced fast electrons by 3D hybrid particle-in-cell modeling of angularly resolved bremsstrahlung
The interaction of an intense short-pulse laser with a solid target efficiently generates energetic (fast) electrons above the energy of 1 Mega-electronvolt (MeV). Characterization of such high-energy electrons is critical for numerous applications, such as the generation of secondary particle …
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