Experimental apparatus for critical current measurement above 5 K using Bi-based oxide current leads

Experimental apparatus for the measurement of temperature dependence of critical current within a strong magnetic field has been developed. Samples, which are tested by the four probe method are cooled by a Gifford-McMahon (GM) type cryocooler to the lowest temperature of 5 K. The sample holder has...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1997-06, Vol.7 (2), p.707-710
Main Authors: Hasebe, T., Mitsubori, H., Sakuraba, J., Ishihara, M., Awaji, S., Watanabe, K.
Format: Article
Language:English
Subjects:
Applied sciences
Critical current
Current measurement
Electric connection. Cables. Wiring
Electrical engineering. Electrical power engineering
Exact sciences and technology
Lead compounds
Magnetic field measurement
Magnetic fields
Probes
Superconducting magnets
Temperature dependence
Temperature measurement
Testing
Testing. Reliability. Quality control
Various equipment and components
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Summary:Experimental apparatus for the measurement of temperature dependence of critical current within a strong magnetic field has been developed. Samples, which are tested by the four probe method are cooled by a Gifford-McMahon (GM) type cryocooler to the lowest temperature of 5 K. The sample holder has a diameter of 70 mm and a height of 70 mm. Transport currents, up to 150 A, are supplied to two samples through Bi-based oxide superconducting current leads. An external magnetic field of up to 15 T, which is applied to the samples perpendicular to the sample axis, is generated by a water cooled single Bitter magnet with a room temperature bore of 82 mm. As a performance test, the critical current properties of a silver clad Bi-based oxide tape have been measured at 5.5 K, 30 K and 50 K within a magnetic field up to 15 T. This experiment has demonstrated the validity of this experimental apparatus.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.614602