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 24 for “"Ionized gases"”.
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Magnetohydrodynamic containment in partially ionized gases
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1962.
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Particle and energy fluxes in weakly ionized gases
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1963.
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Application of the kinetic theory of partly ionized gases to radiation transfer and ionization in hydrogen nebulae
… wide range of physical parameters a well defined ionized region surrounds the star. Ionizing radiation undergoes little absorption within this region, but it is rapidly extinguished at the boundary. The radius of the ionized region and the form of the boundary are discussed, and their dependence …
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Radiation emission and absorption in a hydrogen plasma of a laser engine
… Some of the fundamental concepts involving ionized gases and collision phenomena are presented, and a rigorous approach is used to show that classical mechanics is quite appropriate to our study. As an application to a laser engine, we investigate the effects of the maximum temperature, the …
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A linear response analysis of electromagnetic radiation emanating from a plasma
"A many body analysis is made to determine the radiation (due to current fluctuations) that emanates from a high-density, low-temperature ""quantum"" plasma, and in the classical limit, for a low-density, high-temperature ""classical"" plasma. Radiation due to field fluctuations that are …
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Plasmas of Arbitrary Neutrality
The physics of partially neutralized plasmas is largely unexplored, partly because of the difficulty of confining such plasmas. Plasmas are confined in a stellarator without the need for a plasma current, and regardless of the degree of neutralization. The Columbia Non-neutral Torus (CNT) is a …
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Shock Wave Dispersion in Weakly Ionized Gas
… wave modification in non-equilibrium weakly ionized gases and to clarify the physical mechanisms of the shock wave modification process. The discharge was generated in 99.99% Ar at a gas pressure between 20 and 100 Torr and at a discharge power density less than 10.0 Watts/cm<sup>3</sup>. …
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Multimode Structure of Resistive Wall Modes near the Ideal Wall Stability Limit
This thesis presents the first systematic study of multimode external kink structure and dynamics in a tokamak using a high-resolution magnetic sensor set. Multimode effects are directly measured, rather than inferred from anomalies in single-mode behavior. In order to accomplish this, an extensive …
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MHD stagnation flow of nanofluid past a permeable shrinking surface with various conditions
The purpose of the present study is to analyze the effects of slip and heat source/sink on magnetohydrodynamic stagnation-point flow and heat transfer past a permeable shrinking surface with convective boundary condition. The velocity and temperature profiles are analyzed with respect to the …
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Consistent treatment of transport properties of weakly-ionized gas mixtures in DSMC
… types of collisional interactions in a weakly-ionized gas mixture is examined. Use of the VSS model, that could account for the anisotropic scattering of the collision process, was found to be necessary to achieve consistency in transport processes of ionized gases. The agreement of the VSS …
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Microwave emission in a plasma filled nonuniform backward wave oscillator
High power microwave radiation is used in science, industry, and by the military for a variety of purposes including the acceleration of particles in high energy physics, heating of plasma particles, radiation treatment of surfaces in manufacturing, and for electronic warfare in the military. Among …
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An investigation into phenomena which influence the optimisation of ion plating systems
Ion plating involves the transportation of vapour through a low pressure glow discharge to form solid coatings on negatively biased substrates. Although the method has gained commercial acceptance, particularly for engineering applications, much of the underlying science of the process is poorly …
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Symmetry Breaking and the Inverse Energy Cascade in a Plasma
The application of electrostatic bias to both low density plasma with coherent fluctuations and high density plasma with turbulent fluctuations confined by a magnetic dipole are investigated. Previously, electrostatic biasing of low density plasma was symmetric, drove rapid plasma rotation, and …
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High-Resolution MHD Spectroscopy of External Kinks in a Tokamak Plasma
This thesis describes the first results of passive and active MHD spectroscopy experiments on the High Beta Tokamak-Extended Pulse (HBT-EP) device using a new array of magnetic diagnostics and coils. The capabilities of the HBT-EP experiment are significantly extended with the installation of a new …
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Scale-bridging molecular dynamics simulations of plasma-surface interactions
… surfaces in close proximity to high temperature, ionized gases in an uncontrolled environment. Examples include plasma facing components in reactor vessels and thermal protection system in re-entry spacecraft. Due to the complex chemistry at the plasma surface boundaries, it is difficulty to …
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Enhancing retarding potential analyzer energy measurements with micro-aligned electrodes
Plasmas are ionized gases, and constitute a large fraction of the known universe. For example, solar wind is a plasma that emanates from the sun reaching the Earth's magnetosphere. At times these ionized species cause beautiful auroral displays over the planet's magnetic poles. Moreover, when a …
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Pressure profiles of plasmas confined in the field of a dipole magnet
Understanding the maintenance and stability of plasma pressure confined by a strong magnetic field is a fundamental challenge in both laboratory and space plasma physics. Using magnetic and X-ray measurements on the Levitated Dipole Experiment (LDX), the equilibrium plasma pressure has been …
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GPU-based, Microsecond Latency, Hecto-Channel MIMO Feedback Control of Magnetically Confined Plasmas
Feedback control has become a crucial tool in the research on magnetic confinement of plasmas for achieving controlled nuclear fusion. This thesis presents a novel plasma feedback control system that, for the first time, employs a Graphics Processing Unit (GPU) for microsecond-latency, real-time …
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