Enhanced static magnetization and creep in fine-filamentary and SSC-prototype strands via helical cabling geometry enhanced proximity effects

Author

Sumption, M.D. ; Marken, K.R., Jr. ; Collings, E.W.

Author_Institution

Battelle Memorial Inst., Columbus, OH, USA

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

751

Lastpage

756

Abstract

Helical-cabling-geometry enhanced proximity effect (PE) magnetization and creep have been found in multifilamentary NbTi/Cu superconductive composites with filament diameters (interfilamentary spacings) of 2.0 (0.39) mu m and 6.0 (1.14) mu m. Single strands were wound into helical coils to simulate round-cable geometry. Additionally, oval coils were wound to verify the existence of enhanced PEs in 6.0 mu m filament diameter material with a large effective coupling length. For the helical coils, when the strand twist pitch was nearly equal to the cable perimeter, PE related magnetization was enhanced, and this magnetization creeps at a significantly greater rate than that of bare NbTi.<>

Keywords

composite superconductors; copper; creep; magnetisation; niobium alloys; proton accelerators; proximity effect; superconducting cables; synchrotrons; titanium alloys; NbTi-Cu; PE related magnetization; SSC-prototype strands; cable perimeter; creep; effective coupling length; enhanced proximity effects; filament diameters; fine-filamentary strands; helical cabling geometry; helical coils; interfilamentary spacings; oval coils; round-cable geometry; static magnetization; strand twist pitch; superconductive composites; Creep; Geometry; Magnetization; Niobium compounds; Proximity effect; Solid modeling; Superconducting coils; Superconductivity; Titanium compounds; Wounds;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233813

Filename

233813