AC Loss Measurements on Multifilamentary BSCCO 2223 High-Temperature Superconductors
A calorimetric method for measuring AC loss in long lengths of high temperature superconductor (HTS) at 77 K has been developed. Complementary systems with resolution down to 1 mW/cc have been installed at Oak Ridge National Laboratory (ORNL) and American Superconductor Corporation (ASC) and give consistent results, confirming the reliability of the technique. AC excitation fields up to 0.25 T and at 5 to 60 Hz are supplied by a multifilament BSCCO solenoid which has been in operation for over a year; this is the world’s first HTS magnet system that performs a useful technical function in a cost-competitive manner. Results are presented on 85 filament BSCCO composite conductors showing dependence suggesting hysteretic losses.
KeywordsNylon Calorimetry Grease Verse Metra
Unable to display preview. Download preview PDF.
- 2.CJ. Christopherson and G.N. Riley Jr., “The Development of Twisted High-Temperature Superconducting Composites,” Submitted to the ICMC/CEM Conference held in Columbus, OH on July 17–22, 1995.Google Scholar
- 3.S. Fleshier, L. Cronis, G. Conway, A.P. Malozemoff, J. McDonald, T. Pe, J.R. Clem, G. Vellego, and P. Metra, “Measurement of the true ac power loss of Bi-2223 composite tapes using the transport technique,” submitted J. Appl. Phys. (1995).Google Scholar
- 7.M. N. Wilson, Superconducting Magnets, Oxford Press, (1983).Google Scholar