Effects of local characteristics on the performance of full length Bi2223 multifilamentary tapes

The effects of local characteristics on the performance of full length Bi2223 multifilamentary tapes are investigated computationally and experimentally at 77 K and self-field. Generally the current–voltage characteristics of superconductors are described by the standard power law model with parameters such as critical current <f>Ic</f> and index <f>n</f>. By measuring the critical current <f>{Ici}</f> and index <f>{ni}</f> values of local tapes, we can get the critical current <f>Ic</f> and <f>n</f> value of full length tapes by means of statistical method. The results show that the distribution of local critical currents are non-uniform, and local critical currents have important effect on the performance of the entire tapes. The critical current of the entire tape is different from the mean value of local critical current based on Gaussian statistical distribution along the long tape. [Copyright &y& Elsevier]