MEASUREMENT AND MODELING OF THE DYNAMIC BEHAVIOR OF AG BI(2223) SUPERCONDUCTING TAPES/

Measurements of Ag/Bi(2223) superconducting tapes have been performed between dc and 30 KHz for under and upper critical currents, up to 2 o r 3 times i(c). A fast power amplifier (100A 30KHz) has been specially built for pulsing such currents in the samples. Measurements in this type of samples show some ac losses. Modeling based on the dc non line arity, triangle and sine measurements is made in such a way that the b ehavior of superconducting devices using this type of tapes can be pre dicted, for any currents in frequency ranges up to 30 KHz and intensit y up to 3 times i(c). We observe an excellent superconductivity recove ry of these samples, and our simple equivalent circuit model offers a good prediction of the sample behaviour.