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 12 of 12 for “"Plasma (Ionized gases)"”.
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A linear response analysis of electromagnetic radiation emanating from a plasma
… 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 independent of current fluctuations are not considered in this paper. The model is a stationary, homogeneous …
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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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Multimode Structure of Resistive Wall Modes near the Ideal Wall Stability Limit
… begins internal, then is ejected from the plasma. This inference is based on the relative amplitudes of secondary modes during 3/1-dominated activity, as well as spectral content of the modes. Conformal conducting wall segments were also retracted away from the plasma surface using …
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Microwave emission in a plasma filled nonuniform backward wave oscillator
… of particles in high energy physics, heating of plasma particles, radiation treatment of surfaces in manufacturing, and for electronic warfare in the military. Among the many sources of high power microwaves, the backward wave oscillator (BWO) is one of the oldest devices and has undergone a …
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An investigation into phenomena which influence the optimisation of ion plating systems
… energy transportation. However, the influence of plasma bombardment is anisotropic and also falls off exponentially with distance from the thermionic emitter. This can be offset by a comparable reduction in coating flux arrival rates if the thermionic emitter is positioned close to the vapour …
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Symmetry Breaking and the Inverse Energy Cascade in a Plasma
… 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 excited the …
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High-Resolution MHD Spectroscopy of External Kinks in a Tokamak Plasma
… effect is detected for the first time in HBT-EP plasmas consisting of the simultaneous existence of m/n=3/1 and 6/2 RWMs which cause the plasma to evolve in a non-rigid multimode manner. Additional mode numbers as high as n=3 are also observed. Active MHD spectroscopy experiments using 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
… 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 control computations. This novel …
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Nested Well Plasma Traps
Criteria for the confinement of plasmas consisting of a positive and negative component in Penning type traps with nested electric potential wells are presented. Computational techniques for the self-consistent calculation of potential and plasma density distributions are developed. Analyses are …
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Confinement of Non-neutral Plasmas in Stellarator Magnetic Surfaces
… create and study small Debye length non-neutral plasmas confined by magnetic surfaces. This thesis describes experimental confinement studies of non-neutral plasmas on magnetic surfaces in CNT. Open orbits exist in CNT resulting in electron loss rates that are much faster than initially …