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.
KeywordsHigh Temperature Superconductor fIlament Conductor Wide Face High Temperature Superconductor Tape Hysteretic Loss
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