Temperature dependence of J/sub c/ for in-situ superconductors

Technical Report · Thu Jan 01 00:00:00 EST 1981

OSTI ID:5224163

Ostenson, J E; Finnemore, D K; Sue, J J; Gibson, E D; Verhoeven, J D

The temperature dependence of J/sub c/ was measured for two different small magnets which had been wound for ac loss measurements. A 20 meter length of core process wire with 0.025 cm diameter was wound on a 1.27 cm diameter mandrel to form a coil having a volume of about 1 cm/sup 3/. This coil was then placed in a heat leak chamber and the entire assembly was put in the bore of a Bitter solenoid. The axis of the coil was parallel to the applied field so that the axis of the individual wire strands were perpendicular to the field. The criterion for J/sub c/ was 2 microvolt across the coil or 1 nanovolt per cm of wire. This is 10/sup 3/ times more restrictive than the usual short sample measurements at 1 V/cm. The samples were prepared from a dendritic Cu-Nb alloy which contained 20 wt % Nb. The reduction area ratio was approximately 30,000 for the extrusion and drawing process. This gives a fairly heavily coarsened wire so the filaments are relatively short. If there is to be a serious degradation of J/sub c/ due to the breakdown of the proximity effect it should occur in these samples. Results are presented and discussed. (WHK)

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5224163
• Report Number(s): IS-M-386; CONF-810835-45; ON: DE82018148
• Resource Relation: Conference: 1981 cryogenic engineering conference, San Diego, CA, USA, 10 Aug 1981
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
36 MATERIALS SCIENCE
COPPER ALLOYS
CRITICAL CURRENT
NIOBIUM ALLOYS
SUPERCONDUCTING MAGNETS
SUPERCONDUCTING WIRES
TIN ALLOYS
CURRENT DENSITY
EXPERIMENTAL DATA
MAGNETIC FIELDS
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
ALLOYS
CURRENTS
DATA
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTROMAGNETS
EQUIPMENT
INFORMATION
MAGNETS
NUMERICAL DATA
PHYSICAL PROPERTIES
SUPERCONDUCTING DEVICES
WIRES
420201* - Engineering- Cryogenic Equipment & Devices
360104 - Metals & Alloys- Physical Properties