Critical-state Flux-density Profiles in Type-II Superconducting Thin-film Strips and Disks PDF Download
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Languages : en
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When a weak magnetic field is applied to a superconducting strip or disk of thickness d (of the order of the penetration depth [lambda]) much less than its width or radius, induced super-currents flow so as to prevent magnetic flux from penetrating the superconductor (except within [lambda] of the edge). A stronger field causes vortices to enter, and the profiles of the macroscopic flux density B are determined by critical-state equations describing bulk pinning. Near the sample edge, where the vortices are, the magnitude of the current density J is J[sub c]. In vortex-free regions of the sample, the magnitude of J is less than J[sub c] but is not zero. The profiles of B can be calculated analytically by assuming that J, averaged over the film thickness, is given by the difference between the values of the tangential component of B at the top and bottom surfaces of the film. This paper examines the basis for this assumption, which is equivalent to assuming that the current density is determined solely by the curvature of H, rather than by the gradient of its magnitude. It is shown that this is a good approximation for thin-film strips and disks.
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Languages : en
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Book Description
When a weak magnetic field is applied to a superconducting strip or disk of thickness d (of the order of the penetration depth [lambda]) much less than its width or radius, induced super-currents flow so as to prevent magnetic flux from penetrating the superconductor (except within [lambda] of the edge). A stronger field causes vortices to enter, and the profiles of the macroscopic flux density B are determined by critical-state equations describing bulk pinning. Near the sample edge, where the vortices are, the magnitude of the current density J is J[sub c]. In vortex-free regions of the sample, the magnitude of J is less than J[sub c] but is not zero. The profiles of B can be calculated analytically by assuming that J, averaged over the film thickness, is given by the difference between the values of the tangential component of B at the top and bottom surfaces of the film. This paper examines the basis for this assumption, which is equivalent to assuming that the current density is determined solely by the curvature of H, rather than by the gradient of its magnitude. It is shown that this is a good approximation for thin-film strips and disks.
Author: H W Weber
Publisher: World Scientific
ISBN: 981455068X
Category :
Languages : en
Pages : 716
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Applications of superconductivity at the boiling temperature of liquid nitrogen continue to challenge physicists, materials scientists and engineers all over the world eight years after the discovery of high temperature superconductivity. The key to a solution of today's problems lies in the optimization of the defect structure in well-oriented oxide materials as well as in a fundamental understanding of the magnetic microstructures in the mixed state and how they are affected by the crystallographic nature ('dimensionality') of these materials. Fifteen invited overview lectures as well as approximately 150 contributed papers highlight the state of the art in this important field of superconductivity and review our current knowledge of critical currents in superconductors.
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Category : Aeronautics
Languages : en
Pages : 312
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Author: Jun Zhu
Publisher:
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Category :
Languages : en
Pages : 316
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Author: R. Kossowsky
Publisher: Springer Science & Business Media
ISBN: 9780792356646
Category : Science
Languages : en
Pages : 792
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A discussion by an assembly of expert physicists and materials scientists, embracing the specific features of vortex-pin interactions, the modes of different kinds of vortex motion under the action of Lorenz force, and the mechanisms of dissipation. The effects of transport and screening currents, superimposed AC magnetic fields and the microwave electromagnetic irradiation on vortex behaviour define the electromagnetic properties of a high-Tc superconducting material. The mechanisms driving the depinning of vortices and the dynamics of their motion determine the critical current density and its file dependence, the mechanisms of energy dissipation, and linear and nonlinear resistivity, AC losses, and noise in electronic circuitry. The book therefore has direct implications for the development of new devices and components in electrical engineering, modern electronics, computer technology, and microwave communication.
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Category : Power resources
Languages : en
Pages : 782
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Author: Teruo Matsushita
Publisher: World Scientific
ISBN: 9814549304
Category :
Languages : en
Pages : 410
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Book Description
These proceedings include 76 papers on vortex structure and dynamics, flux pinning, flux creep and melting, critical state phenomena, weak links as well as technical problems for fabrication of materials with high critical current density, for both high-temperature and low-temperature superconductors.
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ISBN:
Category : Science
Languages : en
Pages : 1796
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Author: Kaoru Yamafuji
Publisher: Springer Science & Business Media
ISBN: 4431685359
Category : Science
Languages : en
Pages : 1339
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Book Description
The field of high-temperature superconductivity has encouraged an inter disciplinary approach to research. It has required significant cooperation and collaboration among researchers, each of whom has brought to it a rich variety of experience from many other fields. Recently, great improvements have been made in the quality of research. The subject has matured and been launched into the next stage through the resonance between science and technology. The current progress of materials processing and engineering in this field is analogous to that previously seen in the development of semiconductors. These include the appearance of materials taking the place of YBa2Cu307 owing to their improved properties (higher critical temperatures and stronger flux pin ning) in which rare earth ions with large radii (La, Nd, Sm) substitute for Y; the development of technology enabling growth control on the nanometer scale; and precise and reproducible measurements that can be used as rigorous tests of theoretical models, which in turn are expected to lead to the develop ment of new devices. For further progress in high-T research, academics and c technologists must pool their knowledge and experience. I hope that this volume will promote that goal by providing the reader with the latest results of high-temperature superconductor research and will stimulate further discussion and collaboration.
Author: Ernest V. Kadyrov
Publisher:
ISBN:
Category :
Languages : en
Pages : 526
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