Second-Generation HTS Conductors potx

[...]... and other HTS materials on these substrates Since successful scale-up to achieve large-scale commercialization is primarily dictated by the price/performance ratio of the conductor, the particular method of film deposition and the choice of the substrate is crucial These Second-Generation HTS conductors, also referred to as “Coated conductors represent one of the most exciting developments in HTS technology... aspects of these second-generation conductors and address questions such as scale-up issues The book is divided into three sections The first section discusses the three methods to fabricate biaxially textured substrates, upon which, epitaxial YBCO or other HTS materials can be deposited to realize a single-crystal-like HTS wire The second section includes chapters on various methods of HTS deposition... includes detailed chapters on other HTS materials such as the various Tl-based and Hg-based conductors This page intentionally left blank CONTENTS Contributors v Preface ix A Methods to Produce Biaxially Textured Substrates 1 IBAD TEMPLATE FILMS FOR HTS COATED CONDUCTORS 3 Paul N Arendt Introduction Modification of crystal structure in metal films by ion bombardment YBCO HTS films on metal and on YSZ buffered... conductors, also referred to as “Coated conductors represent one of the most exciting developments in HTS technology HTS wires based on this technology have the potential to carry 100–1000 times the current without resistance losses of comparable copper wire HTS power equipment based on these HTS conductors has a potential to be half the size of conventional alternatives with the PREFACE xi same or higher... 18.4 18.5 Introduction Fabrication of Hg -HTS films Physical properties of Hg-1212 and Hg-1223 films Applications of Hg -HTS thin films Remaining challenges Acknowledgments References SUBJECT INDEX 317 319 327 338 341 342 342 347 Section A Methods to Produce Biaxially Textured Substrates This page intentionally left blank Chapter 1 IBAD TEMPLATE FILMS FOR HTS COATED CONDUCTORS Paul N Arendt Superconductivity... poorly aligned with the ionassist beam 6 P.N ARENDT 1.3 YBCO HTS FILMS ON METAL AND ON YSZ BUFFERED SUBSTRATES Shortly after high-temperature superconducting (HTS) materials were discovered investigators attempted to deposit them in thin film form on polycrystalline flexible metal alloy substrates with the goal of forming flexible HTS conductors The high temperatures required to deposit superconducting... oxides From industrial scale up and IBAD TEMPLATE FILMS FOR HTS COATED CONDUCTORS 13 *NA = no FWHM data provided 1 INFP = Forschungszentrum Karlsruhe, Institut für Nukleare Festkörperphysik, Karlsruhe, Germany 2 CSIRO = Commonwealth Scientific and Industrial Research Organization—Australia cost related considerations for manufacturing of HTS coated conductors, this makes IBAD magnesia an attractive template... YSZ/Ni-alloy tapes Development of longer length YBCO/IBAD YSZ/Ni-alloy coated 1.7 conductors 1.8 Other IBAD investigations IBAD MgO 1.9 1.10 IBAD template microstructures 1.11 Cost estimate of IBAD MgO templates 1.12 Buffer layers 1.13 Non-IBAD templates for coated conductors 1.14 Summary References 1.1 1.2 1.3 1.4 1.5 1.6 2 EPITAXIAL SUPERCONDUCTORS ON ROLLING-ASSISTED-BIAXIALLY-TEXTURED-SUBSTRATES (RABiTS) 3... flexible, crystallographically single-crystal-like HTS wire is required The first generation HTS wires not only had modest superconducting properties but required the use of significant amounts of silver This increased their cost to a level wherein it was not possible to compete on a price/performance basis to copper wires Furthermore, the first-generation HTS wires could not be made using the YBCO compound... generation high-temperature superconducting (HTS) coated conductors, there are vigorous programs among various institutions and consortia to develop long lengths of high-quality superconducting tapes using cost efficient manufacturing techniques These efforts are exciting in that there are a large variety of competing methodologies being investigated for fabricating these conductors in a cost-effective fashion .