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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 143 for “"Plasma physics"”.
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The discrete velocity method in plasma physics
… velocity model to kinetic theory problems in plasma physics. Numerical approaches commonly used in kinetic theory are described and compared with the discrete velocity models. The discrete Boltzmann equation (DBE) is a commonly used discrete velocity method for problems in rarefied gas …
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Hamiltonian chaos: from galactic dynamics to plasma physics
… the behavior of charged particle orbits in plasma, the motion of stars in barred galaxies, and the diffusion of trajectories in multidimensional maps. First, we systematically explore the interplay between magnetic and kinetic chaos in toroidal fusion plasmas, where non-axisymmetric …
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A theoretical plasma physics model of the plasmatron
… high pressure electric arc discharge inside the Plasmatron Fuel Reformer. The Plasmatron Fuel Reformer uses an electric arc to partially combust fuel in an internal combustion engine to increase efficiency and reduce emissions. Solutions of the conservation equations for the arc yield …
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Existence Results for Plasma Physics Models Containing a Fully Coupled Magnetic Field
… large particle systems in different areas of physics such as kinetic theory of gases, the formation of stellar structures or plasma physics. In the present thesis equations originating in plasma physics are considered which describe the evolution of the time dependent density function f(t,x,v) …
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Particles methods for kinetic equations in plasma physics, collective behaviors and optimization.
… problem related to magnetic confinement in Plasma Physics. We will introduce an optimal control problem and discretize it by means of a particular particle scheme. In Chapter 3 we will formulate a follower-leader kinetic model to simulate the collective motion of birds. We will show how it …
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A Q-switched, cavity-dumped YAG laser for use in plasma physics experiments
… was developed for use as a diagnostic tool in plasma physics experiments. This laser uses an unstable resonator configuration to produce higher gain and better collimation than would otherwise be possible. Pulses of light with energies of 18±2 mJ and FWHMs of about 12 ns were produced. It was …
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An Application of the Lie Group Theory of Continuous Point Transformations to the Vlasov-Maxwell Equations (Plasma Physics)
… to study the Vlasov-Maxwell equations of plasma physics. These equations are first expressed in arbitrary orthogonal, curvilinear coordinates. Their invariance properties are studied in Cartesian, cylindrical and spherical geometries. One-to-one mappings between the admitted groups of …
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Aluminum/aluminum oxide structured microplasma devices: Paschen's Law and applications
Aluminum/aluminum oxide microplasma novel devices can be fabricated by sequences of inexpensive wet electrochemical processes and provide an attractive tool to study plasma physics by modifying the device geometry as desired. A wet electrochemical process, used for fabricating microscale cavities …
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Meta-analysis of Tokamak reactor designs
… class has longer confinement times, higher plasma current, and lower magnetic field while the latter class tends to have lower gain, higher power per surface area, higher power per volume, and much smaller stored magnetic energies. Between the two sets, the non-dimensional plasma physics …
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The Fusion Enterprise Paradox: The Enduring Vision and Elusive Goal of Unlimited Clean Energy
… imaginaries. Positioned within the Princeton Plasma Physics Laboratory in the United States, the international ITER Organization sited in France, and the Max Planck Institute for Plasma Physics in Germany, the three projects are prime examples of big science and technology. Rigorous research …
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An Analytical Model for Fusion First-Wall Temperature Calculations (Conduction)
… The model utilizes input quantities based on plasma physics calculations and couples a two-and-one-half-dimensional geometric analysis with a one-dimensional heat conduction analysis in determining temperature profiles over the surface of and within materials used to confine the plasma and …
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Characterization of a molded plastic array of ten microplasma jet devices
Novel microplasma jet devices can be fabricated in plastic substrates using inexpensive tools and materials. A simple molding process used for creating microplasma channels has been developed at the Laboratory for Optical Physics and Engineering. These devices have provided the opportunity to …
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A MODEL OF THE BEAM-PLASMA DISCHARGE
The beam-plasma instability is one of the most basic and general situations in plasma physics. Under suitable conditions, it gives rise to strong electrostatic waves, which interact with the plasma electrons and ions. If the neutral density is high enough, a charge is ignited, the Beam-Plasma …
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The Concept of Collision Strength and Its Applications
… used as a measure of collision strength in plasma physics for years. The result of this is complication and unnecessary approximation in deriving some of the basic kinetic equations and in calculating some of the basic physical terms. The Boltzmann equation has a five-fold integral collision …
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Fluctuation induced cross-field transport in Hall thrusters and tokamaks
One area of fundamental plasma physics which remains poorly understood is the transport of particles across magnetic field lines at rates significantly higher than predicted by theory exclusively based on collisions. This "anomalous" transport is observed in many different classes of plasma …
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Moment-Based Accelerators for Kinetic Problems with Application to Inertial Confinement Fusion
… Two distinct of approaches exists in modeling plasma physics phenomena: fluid and kinetic approaches. While the fluid approach is computationally less expensive, robust closures are difficult to obtain for a wide separation in temperature and density. While the kinetic approach is a closed …
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Exponential integrators: tensor structured problems and applications
… important equations in various fields, such as plasma physics, mean-field optimal control and computational chemistry. In any case, we provide several numerical examples and we perform extensive simulations, eventually exploiting modern hardware architectures such as multi-core Central …
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Design of Optical Measurements for Plasma Actuators for the Validation of Quiescent and Flow Control Simulations
The concept of plasma flow control is a relatively new idea based on using atmospheric plasma placed near the edge of an air foil to reduce boundary layer losses. As with any new concept, it is important to be able to quantify theoretical assumptions with known experimental results for validation. …
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Self-similar singularity formation and wellposedness theory for compressible fluids and dispersive PDE
… to higher dimensions with applications in plasma physics. We improve the deterministic local wellposedness in the cyilnder both in the deterministic and the probabilistic setting.
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