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 22 for “"Plasma Heating"”.
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Model studies of plasma heating in the continuous casting tundish.
… operated. The model was equipped with a steam heating system that simulates that simulates the tundish plasma heating systems operated by some of the more modem continuous casting plants. Similarity between steam heating in the water model and plasma heating in the tundish has been established. …
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High frequency gyrotrons and their application to tokamak plasma heating
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1981.
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Plasma Heating By Alfven Wave In Field-Reversed Ion Ring Experiment
… The Tokamak, which is a current mainstream plasma confinement device, is the toroidal device with a small poloidal field superimposed on a strong toroidal magnetic field so as to provide particle confinement and macroscopic stability. It is a very complicated machine in practice. Open field …
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Simulation of ionospheric plasma heating experiments in the versatile toroidal facility
… weakly magnetized ( wce < wpe) background plasma of either hydrogen or argon. The HF "pump" wave of ionospheric experiments is modeled by 2.45 GHz microwaves, launched perpendicular to the magnetic field and the density gradient of the VTF in the ordinary mode. The peak plasma density is …
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Energetic particles in the earth's magnetospheric cusps
… raised the question as to whether significant plasma heating may also be occurring in this region. Since the cusp is magnetically connected to a number of other regions in geospace, plasma heating in this region could be a significant contributor to magnetospheric dynamics. The goal of this …
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Effects of suprathermal fusion particles in tokamak plasmas
… slow-down phase, and (2) the importance of the plasma density and temperature in determiningthis drift. The effect the inward drifting has on the spatial profile for the suprathermals approaching thermal energies, on the energy distribution, and on the plasma heating profile is demonstrated for …
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Stable Alfven Wave Dynamo Action in the Reversed Field Pinch
… that self-consistently evaluates a dynamic plasma dynamo. This technique is readily extendable to other plasmas in which dynamic stable mode action is of interest. Such plasmas include Alfven wave current-drive and plasma heating for fusion devices, as well as astrophysical and geophysical …
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Investigation of thermal filamentation instability over Gakona, Alaska
… plate waveguides in mid-latitude ionospheric plasmas during Arecibo, Puerto Rico heating experiments in 1997. The geometry of the kilometer-scale parallel plates predicted by thermal filamentation depends on the mode of the transmitted heater wave, as does the threshold to excite this …
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Multi-fluid Plasma Modelling
Contemporary plasma fusion experiments use significant power injection for plasma heating. The injected power selectively heats only part of the plasma, which then transfers its energy to the rest of the plasma through collisions. Continuous power injection gives rise to a dynamic equilibrium …
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Multi-fluid Plasma Modelling
Contemporary plasma fusion experiments use significant power injection for plasma heating. The injected power selectively heats only part of the plasma, which then transfers its energy to the rest of the plasma through collisions. Continuous power injection gives rise to a dynamic equilibrium …
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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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Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska
… decay instability (PDI) in high-frequency space plasma heating experiments conducted at the NSF/DoD High Frequency Active Auroral Research Program (HAARP) facility in Gakona, Alaska during the spring and summer of 2006. The PDI is the decay of an electromagnetic (EM) wave into an electron plasma …
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Theoretical and experimental investigation of Hall thruster miniaturization
… The scaling analysis preserves the dominant plasma processes that determine thruster performance including ionization, electron confinement and recombination losses. These scaling laws were applied to the design of a 9mm diameter, nominally 200W thruster based on the Russian D-55 anode layer …
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Experimental study of a high efficiency gyrotron oscillator
High power, high frequency gyrotrons used in plasma heating must achieve the highest possible efficiency in order to reduce system size and cost and to minimize thermal and mechanical problems. This thesis presents an experimental study of efficiency enhancement in a 1.5 MW, 110 GHz gyrotron …
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Genesis, dynamics, and dissipation of turbulent magnetic fields
… fields are amplified and sustained by turbulent plasma motions--are well understood. In addition, the role played by these fields in determining the material and thermodynamic properties of cosmic plasmas, which strongly impact various astrophysical phenomena, is still unknown. This thesis …
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Theoretical, computational and experimental analysis of the deflagration plasma accelerator and plasma beam characteristics
Coaxial plasma accelerators have been the subject of experimental and theoretical analysis since the 1950s. Theories have evolved that predict subsets of the measured data. This work separates coaxial plasma accelerator research into two broad categories classified by the ratio of accelerator …
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Radical probe system for in-situ measurements of radical densities of hydrogen, oxygen and nitrogen
… optical equipment. In this study Center for Plasma Material Interactions (CPMI) at the University of Illinois developed an in-situ catalytic radical probe system together with Ra-Den software platform to measure concentrations of reactive species in low temperature plasma with high spatial …
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Multispecies ion acceleration from intense laser interactions with thin foils
… scaling much slower, indicating acceleration by plasma heating. This species dependence is attributed to the precursor laser intensity impinging onto the target. This is shown to result in a multi-species expansion which allows for the preferential acceleration of bulk C<sup>6+</sup> ions over …
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MMS Observations of the Kelvin-Helmholtz Instability and Associated Ion Scale Waves
… are not yet fully understood. Solar wind plasma is heated non-adiabatically as it penetrates the magnetosphere, and this process must span scale sizes. Reconnection alone is not able to account for the observed heating; other mechanisms must be at work. One potential process is the …
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Impacts of Anisotropy, Wave Heating, and Neutral Winds on High-Latitude Ionospheric Dynamics
<p>Significant amounts of ionospheric plasma can be transported to high altitudes (ion upflow) in response to a variety of plasma heating and uplifting processes such as DC electric fields and precipitation. Once ions have been lifted to high altitudes, transverse ion acceleration by broadband ELF …
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