H. Weinstock - Böcker

The volume presents in-depth scientific coverage of a vast number of superconductor-based applications. Some of these applications are quite mature, such as LTS magnets for MRI, while many others are at various stages of maturity. The first three chapters are devoted to understanding of the principles, fabrication and uses of SQUID magnetometers and gradiometers. The next three cover broader aspects of superconducting electronics - digital LTS circuits and passive component applications using HTS materials. The following four chapters go into magnetic applications. Chapter 11 deals with the fabrication of HTS tapes of BSCCO material. Chapter 12 addresses the use of HTS materials in magnetic bearings in low-loss flywheels. Finally, cryogenic systems are dealt with in Chapter 13 and Chapter 14 shows how to design cryogenic measuring systems and how to take valid measurements.

Providing coverage on all aspects of microwave superconductivity this book includes information on: fundamentals, fabrication of thin and thick films, measurement, components, circuits, cryogenic packaging and market potential. The applications examined, using either active or passive circuit elements, include those based on both the older metal-based superconductors, operating at liquid-helium temperatures, and the newer ceramic-based superconductors, operating at liquid-nitrogen temperatures. Applications that are covered in detail include filters, resonators and antennae for wireless communications and military systems, space-based cryoelectronics, RF SQUIDs and DC SQUID amplifiers, NMR and MRI coils, accelerator cavities, and Josephson flux-flow devices in the millimetre and sub-millimetre regimes. This book is intended for use as a textbook in an electrical engineering graduate course in microwave superconductivity or as a reference book for microwave engineers.

Providing coverage on all aspects of microwave superconductivity this book includes information on: fundamentals, fabrication of thin and thick films, measurement, components, circuits, cryogenic packaging and market potential. The applications examined, using either active or passive circuit elements, include those based on both the older metal-based superconductors, operating at liquid-helium temperatures, and the newer ceramic-based superconductors, operating at liquid-nitrogen temperatures. Applications that are covered in detail include filters, resonators and antennae for wireless communications and military systems, space-based cryoelectronics, RF SQUIDs and DC SQUID amplifiers, NMR and MRI coils, accelerator cavities, and Josephson flux-flow devices in the millimetre and sub-millimetre regimes. This book is intended for use as a textbook in an electrical engineering graduate course in microwave superconductivity or as a reference book for microwave engineers.

The volume presents in-depth scientific coverage of a vast number of superconductor-based applications. Some of these applications are quite mature, e.g. LTS magnets for MRI, while many others are at various stages of maturity. The first three chapters are devoted to understanding of the principles, fabrication and uses of SQUID magnetometers and gradiometers. The next three cover broader aspects of superconducting electronics - digital LTS circuits and passive component applications using HTS materials. The following four chapters go into magnetic applications. Chapter 11 deals with the fabrication of HTS tapes of BSCCO material. Chapter 12 addresses the use of HTS materials in magnetic bearings in low-loss flywheels. Finally, cryogenic systems are dealt with in Chapter 13 and Chapter 14 shows how to design cryogenic measuring systems and how to take valid measurements.

ANDRE JONES As everybody knovs, the computer has been used for over ten years in education. Since the first conference at Irvine "The computer in physics instruction" (1965). various meetings on this subject have been organized in many places, which dealt with very different subjects. Work groups have been set up at international level (by the UNESCO, OECD, ... ) and at national level in various countries. Of the prominent extra-European meetings, we will only keep the most important ones. for example those held in the U.S.A. on the "Computer Use in Undergraduate Curriculum" and in Canada, "The Canadian Symposium on Instructional Technology" (1972). As a matter of fact, there have been quite a lot of conferences on this subject in Europe too. For example, the OECD entrusted us with the organizing of a center called U.C.O. 0.1. which would be aimed at two Objectives. On the one hand, to set up a aata bank on the experiments made in the field of the computer use in education; and on the second hand, to stimulate research in this field.

This volume is based on the proceedings of the NATO-sponsored Advanced Studies Institute (ASn on The New Superconducting Electronics (held 9-20 August 1992 in Waterville Valley, New Hampshire USA). The contents herein are intended to provide an update to an earlier volume on the same subject (based on a NATO ASI held in 1988). Four years seems a relatively short time interval, and our title itself, featuring The New Superconducting Electronics, may appear somewhat pretentious. Nevertheless, we feel strongly that the ASI fostered a timely reexamination of the technical progress and application potential of this rapid-paced field. There are, indeed, many new avenues for technological innovation which were not envisioned or considered possible four years ago. The greatest advances by far have occurred with regard to oxide superconductors, the so-called high­ transition-temperature superconductors, known in short as HTS. These advances are mainly in the ability to fabricate both (1) high-quality, relatively large-area films for microwave filters and (2) multilayer device structures, principally superconducting-normal-superconducting (SNS) Josephson junctions, for superconducting-quantum-interference-device (SQUID) magnetometers. Additionally, we have seen the invention and development of the flux-flow transistor, a planar three-terminal device. During the earlier ASI only the very first HTS films with adequate critical-current density had just been fabricated, and these were of limited area and had high resistance for microwave current.