Examination and Analysis of Critical Current Uniformity of Long HTS Tapes by the MCorder
Applied Superconductivity, IEEE Transactions （2015）
摘要
The magnetic circuit (MC) method has been developed to measure the critical current (Ic) of long high temperature superconductor (HTS) tapes continuously since 2010. So far, with the apparatus based on the MC method, namely MCorder, industrial HTS tapes produced by main manufactures worldwide have been measured using the MC method, including Bi2223/Ag multifilament tapes and coated conductors with/without magnetic substrates. The high speed (360 m/h), high accuracy measurement (resolution 1 A) and its adaption to all kinds of HTS tapes make large quantity measurement and statistical evaluation of HTS tape possible. In this paper, criteria for Ic assessment of long HTS tapes is discussed, based on which analysis of samples from different manufacturers worldwide is provided. The measurement result of a Bi2223/Ag tape by MC method is compared with section-by-section four-probe method, and the two methods show good agreement. Fourier analysis is given for analyzing Ic periodicity of a tape with periodical artificial defects.
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关键词
fourier analysis,bismuth compounds,calcium compounds,critical currents,high-temperature superconductors,multifilamentary superconductors,silver,statistical analysis,strontium compounds,superconducting tapes,bi2223-ag multifilament tapes,bi2sr2ca2cu3o10+x-ag,mcorder,coated conductors,critical current uniformity,long hts tapes,long high temperature superconductor tapes,magnetic circuit method,magnetic substrates,periodical artificial defects,section-by-section four-probe method,statistical evaluation,fourier,hts tape,magnetic circuit,statistics,superconducting magnets,high temperature superconductors,magnetic circuits
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