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Full-Text Articles in Electrical and Computer Engineering
Recurring Beams In Hollow Metal Waveguides: Paraxial Approximation, Lee W. Casperson
Recurring Beams In Hollow Metal Waveguides: Paraxial Approximation, Lee W. Casperson
Electrical and Computer Engineering Faculty Publications and Presentations
For optical and near-optical applications in electromagnetics, the directed propagation of waves in free space and in lenslike media is often in the Cartesian form of Gaussian or more general Hermite-sinusoidal-Gaussian beams. It has been shown that recurring (rather than continuing) forms of such beams are possible in the paraxial approximation for certain hollow metal waveguides, in which multiple reflections from the waveguide walls may occur. Limitations on this recurrence behavior implicit in use of the paraxial approximation are considered here, and estimates are obtained for the maximum propagation distance before the onset of significant distortion of the recurring beams.
A Simplistic Plasma Dust Removal Model Employing Radiation Pressure, Robert A. Schill Jr.
A Simplistic Plasma Dust Removal Model Employing Radiation Pressure, Robert A. Schill Jr.
Electrical & Computer Engineering Faculty Research
A simple heuristic model is developed to examine the feasibility of using radiation pressure as a means to transport plasma dust out of the path of the forthcoming electron or photon beam. A slow electromagnetic surface wave coupled to a planar target or substrate exerts the required pressure in the removal process. The model is examined using data and parameters from single-shot radiography experiments. Optimal source requirements are identified for a typical radiography experiment. Source energies and powers are a minimum over an optimum band of frequencies where both conduction and plasma oscillation effects are mutually significant. Above the band …