Critical current anistropy in NbTi cables
The short sample critical current of multifilamentary NbTi cables is usually measured in a magnetic field which is oriented perpendicular to the broad face of the cable. This is the same orientation that occurs at the equatorial turns of a cos theta type dipole magnet and is, therefore, usually specified in quality control short sample tests. It is generally found that the current density in cables is less than in wires. This degradation, as it is commonly called, may be as large as 15%. The effect is illustrated in a statistical way which shows the distribution of wire and cable results for the Colliding Beam Accelerator Project at BNL. The current densities were calculated using geometrical data given below. Some 200 cable and 750 wire tests are included in the normal curve distributions shown. The mean cable Jc is 14% lower than that of the wire. Similar results were obtained in previous work. In this note we present results of critical current measurements which are made with the applied magnetic field oriented parallel to the plane of the cable (still perpendicular to the direction of current flow) as well as perpendicular. It is found that the parallel critical current is generally larger than the perpendicular and is usually almost equal to that of the wires prior to cabling. The degradation is small for the parallel field orientation.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6336808
- Report Number(s):
- BNL-35251; CONF-840937-15; ON: DE85000889
- Resource Relation:
- Conference: Applied superconductivity conference, San Diego, CA, USA, 9 Sep 1984; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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GENERAL PHYSICS
SUPERCONDUCTING WIRES
CRITICAL CURRENT
EXPERIMENTAL DATA
MAGNETIC FIELD CONFIGURATIONS
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ELECTRIC CURRENTS
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NUMERICAL DATA
TESTING
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420201* - Engineering- Cryogenic Equipment & Devices