Variation of local critical current and its influence on overall current of bent multifilamentary Bi2223/Ag tape

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• 作者：S. Ochiai ; D. Doko ; H. Rokkaku ; M. Fujimoto ; H. Okuda ; M. Hojo ; M. Tanaka ; M. Sugano ; K. Osamura ; M. Mimura
• 关键词：Bi2223 ; Composite superconductor ; Critical current ; Bending
• 刊名：Physica C
• 出版年：2006
• 出版时间：1 October 2006
• 年：2006
• 卷：445-448
• 期：Complete
• 页码：746-750
• 全文大小：239 K

文摘

The correlation between the local and overall currents in a multifilamentary Bi2223/Ag/Ag alloy composite tape under bending strain was studied. The correlation of the measured distributed local critical current and n-value to overall critical current was described comprehensively with a voltage summation model that regards the overall sample to be composed of a series circuit. The analysis of the measured critical current and n-value revealed that the distribution of local critical current could be described with the Weibull distribution function and the n-value could be expressed as a function of critical current as a first approximation. By combining the Weibull distribution function of the local critical current, the empirical formula of the n-value as a function of critical current, voltage summation model and Monte Carlo method, the overall current and n-value could be predicted fairly well from those of local elements.