Filamentary A15 SuperconductorsMasaki Suenaga, A. F. Clark Compound superconductors with the Al5 structure carry the promise of the second generation in practical superconductivity. They will provide higher operating magnetic fields at higher tem peratures than the preceding alloy superconductors. To fulfill this promise, their brittle nature must be accommodated in a fila mentary structure. Achieving this has been no simple task and imaginative research and clever production techniques have led to many usable conductor configurations. In addition, several new and exciting possibilities are being proposed; for example, in situ processing promises easier production with improved strain toler ance. It is timely, therefore, to take measure of what we have achieved and to assess our understanding so that we may choose, with some confidence, paths for future research and potential ap plications. To meet these needs, the International Cryogenic Materials Conference Board has sponsored this special topic conference on Filamentary Al5 Superconductors bringing together superconductiv ity researchers, superconducting wire producers, and high field magnet users to discuss current research problems. That the in formation exchange was intensive and successful is evidenced by the excellent papers in this volume. In order to capture some of the synergistic wisdom generated in discussions at the conference several people were asked to assemble and interpret the comments and concerns of the fusion, high energy physics, solid state phys ics, and metallurgy groups. |
Contents
Development of A15 Multifilamentary Superconductors | 17 |
Work in the U K on Filamentary A15 Conductor | 35 |
Development of A15 Multifilamentary Superconductors | 47 |
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A/cm² A15 phase ac losses Airco alloy annealing Appl applied behavior bending strain Bevk bronze matrix bronze process cable coil composite compound compressive strain core critical current density critical field cross section Cryogenic Cu-Nb Cu-Nb-Sn curves deformation dendrites diameter diffusion ductors effect eutectic external bronze extrusion fabrication filamentary filaments flux pinning grain heat treatment high field IEEE IEEE Trans in-situ increase infiltration intrinsic strain Laboratory Luhman magnetic field materials maximum measured microstructural multifilamentary Nb3Sn Nb3Sn conductors Nb3Sn layer Nb3Sn wire niobium obtained parameters Phys plot powder proximity effect ratio reacted reaction reduced sample scaling law shown in Fig shows sintering Sn content specimens stability stoichiometry strain dependence strands Suenaga superconducting superconducting properties Tachikawa tantalum tape technique temperature tensile strain tensile stress tesla thickness tion tube twisted uniaxial strain V3Ga values versus volume fraction wire drawing Young's modulus