Teruo Matsushita - Böcker

This book introduces readers to the characteristic features of electromagnetic phenomena in superconductivity.

This book covers the flux pinning mechanisms and properties and the electromagnetic phenomena caused by the flux pinning common for metallic, high-Tc and MgB2 superconductors.

This book covers the flux pinning mechanisms and properties and the electromagnetic phenomena caused by the flux pinning common for metallic, high-Tc and MgB2 superconductors.

The author provides chapters on electromagnetism and electric circuits separately and gives a chapter explaining the correlation between them in detail. In the chapters for electric circuit, DC electric circuits, transient and steady response of AC electric circuits are treated.

The author provides chapters on electromagnetism and electric circuits separately and gives a chapter explaining the correlation between them in detail. In the chapters for electric circuit, DC electric circuits, transient and steady response of AC electric circuits are treated.

This book covers a great variety of problems on electricity and magnetism described in the textbook, "Electricity and Magnetism", in which superconductors are classified as one kind of magnetic materials.

This comprehensive textbook covers electricity and magnetism in great depth, with the 3rd edition offering updated descriptions of electromagnetic phenomena to help students achieve a more thorough understanding of the subject.In the 1st edition, superconductivity was emphasized, a focus that continued in the 2nd edition, which strengthened the E-B analogy by comparing equipotential surfaces in electricity to equivector potential surfaces in magnetism. The 3rd edition introduces the concept of mean magnetic flux, which aids in determining inductance from magnetic energy. It also demonstrates how vector potential can be directly used to calculate electromotive force.A unique phenomenon is presented when applying current to a superconducting transmission line, where the induced electric field's vector potential is perpendicular to the current. This deviation from common equations can still be explained through Maxwell’s theory, leading to the correct solution.For a more in-depth grasp of electricity and magnetism, students are encouraged to use Exercises in Electricity and Magnetism by the same author, which offers 400 practice problems. This textbook is ideal for advanced students of physics, astrophysics, or engineering, as well as a valuable reference for professional scientists.

This end edition introduces to the characteristic features of electromagnetic phenomena in superconductors, demonstrating how these phenomena not only align with Maxwell’s theory but also expand its scope. By presenting examples of peculiar magnetic behaviors, the book broadens the reader’s understanding of electromagnetism and its implications in superconductivity.The book explores key concepts such as flux pinning, responsible for non-dissipative currents in DC systems and hysteretic irreversibility in AC systems. This irreversibility, akin to friction, arises from the instability in the motion of quantized magnetic flux lines. Additionally, the longitudinal magnetic field effect is examined, highlighting its role in advancing Maxwell’s theory. Through these discussions, readers will gain insights into the dynamics of quantized magnetic flux lines and the critical current density, crucial for the practical application of superconductors.With numerous appendices to support the derivation of complex equations, this book is an essential resource for students and young scientists interested in applied superconductivity, particularly in power applications. It offers a comprehensive introduction to the electromagnetic phenomena in superconductors, from fundamental principles to advanced topics. Graduate students, researchers, and engineers in the electric utility industry will find this book invaluable for its detailed exploration of superconductivity and its applications.Researchers and practitioners in the field of superconductivity, as well as engineers working in the electric utility industry, will benefit from the insights provided in this book. It serves as a critical resource for understanding the electromagnetic phenomena in superconductors and their practical applications, making it a must-read for those seeking to deepen their knowledge in this area.

Superconductivity is now a considerable focus of attention as one of the te- nologies which can prevent environmental destruction by allowing energy to be used with high e?ciency. The possibility of practical applications of sup- conductivitydependsonthemaximumcurrentdensitywhichsuperconductors can carry, the value of losses which superconductors consume, the maximum magnetic ?eld strength in which superconductors can be used, etc. These f- tors are directly related to the ?ux pinning of quantized magnetic ?ux lines in superconductors. This book extensively describes related subjects, from the fundamental physics of ?ux pinning to electromagnetic phenomena caused by ?ux pinning events, which will be useful for anyone who wants to understand applied superconductivity. The Japanese edition was published for this purpose in 1994. Since then, there has been signi?cant progress in the research and development of hi- temperature superconductors. In particular, the new superconductor MgB 2 was discovered in 2001, followed by steady improvements in the superc- ducting properties necessary for applications. On the other hand, there are no essential di?erences in the ?ux pinning phenomena between these new superconductors and metallic superconductors. Hence, the framework of the previous Japanese edition was kept unchanged, while new description was added on these new superconductors in the English edition. In the following the content of each chapter is brie?y introduced.

The book covers the flux pinning mechanisms and properties and the electromagnetic phenomena caused by the flux pinning common for metallic, high-Tc and MgB2 superconductors. The condensation energy interaction known for normal precipitates or grain boundaries and the kinetic energy interaction proposed for artificial Nb pins in Nb-Ti, etc. are introduced for the pinning mechanism. Summation theories to derive the critical current density are discussed in detail. Irreversible magnetization and AC loss caused by the flux pinning are also discussed. The loss originally stems from the ohmic dissipation of normal electrons in the normal core driven by the electric field induced by the flux motion.The readers will learn why the resultant loss is of hysteresis type in spite of such mechanism. The influence of the flux pinning on the vortex phase diagram in high Tc superconductors is discussed and the dependencies of the irreversibility field are also described on other quantities such as anisotropy of superconductor, specimen size and electric field strength. Recent developments of critical current properties in various high-Tc superconductors and MgB2 are introduced.Other topics are: singularity in the case of transport current in a parallel magnetic field such as deviation from the Josephson relation, reversible flux motion inside pinning potentials which causes deviation from the critical state model prediction, the concept of the minimization of energy dissipation in the flux pinning phenomena which gives the basis for the critical state model, etc. Significant reduction in the AC loss in AC wires with very fine filaments originates from the reversible flux motion which is dominant in the two-dimensional pinning. The concept of minimum energy dissipation explains also the behavior of flux bundle size which determines the irreversibility line under the flux creep.The new edition has been thoroughly updated, with new sections on the progress in enhancing the critical current density in high temperature superconductors by introduction of artificial pinning centers, the effect of packing density on the critical current density and irreversibility field in MgB2 and derivation of the force-balance equation from the minimization of the free energy including the pinning energy.

The book covers the flux pinning mechanisms and properties and the electromagnetic phenomena caused by the flux pinning common for metallic, high-Tc and MgB2 superconductors. The condensation energy interaction known for normal precipitates or grain boundaries and the kinetic energy interaction proposed for artificial Nb pins in Nb-Ti, etc. are introduced for the pinning mechanism. Summation theories to derive the critical current density are discussed in detail. Irreversible magnetization and AC loss caused by the flux pinning are also discussed. The loss originally stems from the ohmic dissipation of normal electrons in the normal core driven by the electric field induced by the flux motion.The readers will learn why the resultant loss is of hysteresis type in spite of such mechanism. The influence of the flux pinning on the vortex phase diagram in high Tc superconductors is discussed and the dependencies of the irreversibility field are also described on other quantities such as anisotropy of superconductor, specimen size and electric field strength. Recent developments of critical current properties in various high-Tc superconductors and MgB2 are introduced.Other topics are: singularity in the case of transport current in a parallel magnetic field such as deviation from the Josephson relation, reversible flux motion inside pinning potentials which causes deviation from the critical state model prediction, the concept of the minimization of energy dissipation in the flux pinning phenomena which gives the basis for the critical state model, etc. Significant reduction in the AC loss in AC wires with very fine filaments originates from the reversible flux motion which is dominant in the two-dimensional pinning. The concept of minimum energy dissipation explains also the behavior of flux bundle size which determines the irreversibility line under the flux creep.The new edition has been thoroughly updated, with new sections on the progress in enhancing the critical current density in high temperature superconductors by introduction of artificial pinning centers, the effect of packing density on the critical current density and irreversibility field in MgB2 and derivation of the force-balance equation from the minimization of the free energy including the pinning energy.

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.