Magnetization and critical currents of tin-core multifilamentary Nb sub 3 Sn conductors

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:5845800

Ghosh, A K; Suenaga, M

This paper presents critical current and magnetization data for some multifilamentary Nb{sub 3}Sn wires that have been produced by the internal-tin method. A comparison of magnetization and transport critical current measurements show that filament bridging during heat treatment is a common occurrence leading to effective filament diameters that are sometimes an order of magnitude larger than the geometrical filament size. At present, J{sub c}'s (in the non-copper region) greater than 1300 A/mm{sup 2} at 10T have been achieved in some conductors, which also exhibit high losses. Low losses have only been seen in conductors with a high local ratio of niobium to copper. Also the use of (Nb-1%Ti) alloy instead of pure Nb helps to reduce low field loss and increase high field J{sub c}. Measurements of the temperature dependence of hysteretic loss to 5T indicate that loss decreases linearly with increasing temperature. 22 refs., 6 figs., 2 tabs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5845800
• Report Number(s): BNL-44556; CONF-900944--45; ON: DE91012241
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
426001 -- Engineering-- Superconducting Devices & Circuits-- (1990-)
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL CURRENT
CURRENTS
ELECTRIC CURRENTS
HYSTERESIS
MAGNETIZATION
NIOBIUM COMPOUNDS
REFRACTORY METAL COMPOUNDS
SUPERCONDUCTING WIRES
TEMPERATURE DEPENDENCE
TIN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WIRES