Direct Electromagnetic Generation of Transverse Acoustic Waves in Type II Superconductors PDF Download
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Author: Gary Stanley Cieloszyk
Publisher:
ISBN:
Category : Electromagnetic fields
Languages : en
Pages : 168
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Author: Gary Stanley Cieloszyk
Publisher:
ISBN:
Category : Electromagnetic fields
Languages : en
Pages : 168
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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 516
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Author: Martin R. Gaerttner
Publisher:
ISBN:
Category : Sound-waves
Languages : en
Pages : 332
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Book Description
"A method of generating (and detecting) ultrasound in metals through purely electromagnetic means is investigated in this thesis. Radio frequency pulse echo techniques used for studying this process, called direct generation (or detection), are described. Measurements of the coupling efficiency of direct generation in a number of metals are reported for both the local and non local limits of electrical conductivity. Accurate measurements of the temperature, frequency, and magnetic field dependence have been made using frequencies between 3 and 100MHz. A free electron theory which assumes specular scattering of electrons at the surface has been proposed by others. This theory is extended in this thesis and quantitative comparisons with experimental measurements are presented. It has been found that, in the local limit of conductivity, experiment and theory are in good agreement for both transverse and longitudinal waves. In the non local limit, only transverse wave direct generation was considered. Discrepancies between experiment and theory were observed for the non local case with a magnetic field parallel to the direction of acoustic propagation. It is postulated that effects of diffuse scattering of electrons at the surface are responsible for some discrepancies. An interesting oscillatory magnetic field dependence of direct generation is reported for magnetic fields oriented perpendicular to the direction of acoustic propagation. The effect is demonstrated to result from forces associated with Gantmakher splashes. Although the coupling efficiency of direct electromagnetic generation is weak, it is demonstrated that signals can be obtained that are useful for non destructive testing. There are indications that non local direct generation becomes very efficient at microwave frequencies. Direct generation has also been observed in liquid metals."--Abstract.
Author:
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 1528
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Author: Vernon L. Newhouse
Publisher: Academic Press
ISBN: 1483273210
Category : Technology & Engineering
Languages : en
Pages : 329
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Book Description
Applied Superconductivity, Volume II, is part of a two-volume series on applied superconductivity. The first volume dealt with electronic applications and radiation detection, and contains a chapter on liquid helium refrigeration. The present volume discusses magnets, electromechanical applications, accelerators, and microwave and rf devices. The book opens with a chapter on high-field superconducting magnets, covering applications and magnet design. Subsequent chapters discuss superconductive machinery such as superconductive bearings and motors; rf superconducting devices; and future prospects in applied superconductivity. Each chapter in the two volumes can be read independently, and most assume very little or no background in the physics of superconductivity. The topics treated do not require the use of advanced quantum mechanics; thus the books should be accessible to students or research workers in any branch of engineering or physics. They are intended to serve both as a source of reference material to existing techniques and as a guide to future research.
Author:
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Category : Metallurgy
Languages : en
Pages : 682
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Author: Atomic Energy Commission. Division of Plans and Reports
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1144
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 912
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Author:
Publisher:
ISBN:
Category : Solids
Languages : en
Pages : 804
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 186
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