Fundamental elements of applied superconductivity in by Yinshun Wang

By Yinshun Wang

Superconducting expertise is in all likelihood very important as one of many destiny shrewdpermanent grid applied sciences. it's a mixture of superconductor fabrics, electric engineering, cryogenic insulation, cryogenics and cryostats. there was no particular booklet totally describing this department of technology and know-how in electric engineering. besides the fact that, this ebook comprises those components, and is key for these majoring in utilized superconductivity in electric engineering.

Recently, superconducting know-how has made nice growth. Many universities and firms are all in favour of utilized superconductivity with the aid of presidency. Over the subsequent 5 years, departments of electric engineering in universities and corporations becomes extra all for this sector. This book:

• will allow humans to at once perform study on utilized superconductivity in electric engineering
• is extra finished and sensible when put next to different advances
• provides a transparent advent to the appliance of superconductor in electric engineering and similar primary technologies
• fingers readers with the technological points of superconductivity required to supply a machine
• covers strength offering applied sciences in superconducting electrical apparatus
• is definitely prepared and adaptable for college students, academics, researchers and engineers
• lecture slides appropriate for academics to be had at the Wiley significant other Website

primary components of utilized Superconductivity in electric Engineering
is perfect for educational researchers, graduates and undergraduate scholars in electric engineering. it's also a good reference paintings for superconducting equipment researchers and engineers.

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Extra info for Fundamental elements of applied superconductivity in electrical engineering

Example text

When the temperature rises to the critical temperature, T = Tc, and the superconducting electron density is equal to zero, then the superconductor transits to the normal state from the superconducting state, namely, the superconductor quenches. 2 Microscopic Theory – BCS Theory Although the two-fluid model simply and qualitatively explains the macroscopic superconducting phenomena, as a phenomenological model it cannot fundamentally explain the mechanism of superconductivity. In order to deeply understand superconductivity with the zero-resistance effect, BCS theory that describes superconductivity from a microscopic point of view is introduced according to the Bose–Einstein condensation and interaction theory between electrons and lattice in quantum mechanics.

It also characterizes the acute degree of transition of a superconductor from superconducting state to normal state. 60) where Ueff(B, T) is the effective pinning potential of superconductors and is a function of magnetic field and temperature. It also relates to the processing technology of a superconductor and with its intrinsic properties, and kB is the Bolzmann constant. 61) where units of E and Ec are μV/cm. 61). Criteria are needed to determine the critical current and n value of a superconductor.

1 Critical Temperature Tc The superconductor shows superconductivity when its temperature is below a certain value, that is, the temperature at which the superconductor transfers to a superconducting state from a normal state. This temperature is called the critical temperature and is denoted by Tc. In general, the superconducting transition usually occurs in a temperature range near Tc, which is called the temperature transition width represented by ΔTc. 5 to 1 K, owing to their intrinsic characteristics, such as internal inhomogeneity, weak link, granularity and defects.

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