Title :
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
fDate :
3/1/1993 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
