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

Conference · Mon Jan 01 00:00:00 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: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5845800
• Report Number(s): BNL-44556; CONF-900944-45; ON: DE91012241
• Resource Relation: Conference: Applied superconductivity conference, Aspen, CO (USA), 24-28 Sep 1990
• Country of Publication: United States
• Language: English

Related Subjects

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