商品詳細

This book is written for students and practitioners for use it as a textbook. In its 20 Chapters, the book explains simulation of the first instants of temperature evolution when a superconductor sample is subject to a disturbance.

Such a study is not found in current superconductor literature. But it is this period of time, some milliseconds, that has to be investigated in detail, to detect and avoid superconductor quench as early as possible. It is therefore not transport phenomena over extended periods, the conventional range of investigations, that is simulated in this book.

The book instead analyses short-time, temporal and spatial resolution of a competition between quench and superconductor relaxation. This includes a critique of standard superconductor theory, with focus on integration of the Pauli exclusion principle during relaxation, and a virtual disputation between two scientists on how to calculate relaxation time. By a systematic discussion of convergence and reproducibility of simulated results, the reliability of predictions of superconductor states is discussed when a sample approaches the thermal phase transition. For this purpose, the book considers correlations between stability functions, density of electron pairs, critical current density and entropy production.

The book focuses on simulations under non-uniform conditions. Non-uniform temperature, as the most important among the three classical, critical superconductor parameters, and accordingly, of non-uniform, spatial and temporal distribution of critical and transport or shielding currents after disturbances, altogether set realistic conditions under which simulations over extended periods of time may become meaningful.

The simulations are applied to multi-filamentary and multi-layered superconductors, all under local disturbances, as examples to find solution of Fourier's Differential Equation by the Finite Element method also in complicated superconductor architecture. The simulations are extended to miniature and micro-miniature superconductor samples. Flux flow resistance of superconductors is considered in all simulations.

By application of the Laser-Flash method, the book suggests obtaining thermophysical data (diffusivity) from transient temperature distributions, when they are needed for the simulations, instead of using temperature at just single front or rear side sample positions, the conventional approach.