Abstract
Losses were calorimetrically measured for five multilayer superconducting solenoids carrying pulsed dc transport currents. The solenoids, which were wound from commercial NbTi multifilamentary wire, had self-fields of B*<B<15 B*, where B* is the calculated field for full penetration of the filament. Loss measurements were taken as a function of peak current at a fixed frequency of 10 Hz and as a function of frequency (1–10 Hz) at a peak current of 30 A. The data do not agree with existing full or partial penetration loss models. The range of magnetic fields between the dominance of either full or partial penetration was found to be wider than expected. A model proposed by Ashkin predicted such a region and his technique for loss calculation agrees with the data.
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