Longitudinal Critical Current Profiles in Coated Conductors Examined by Transport and Magnetization Measurements
IEEE Transactions on Applied Superconductivity（2023）
Abstract
Critical current (
Ic
) variations along the coated conductor (CC) have a significant impact on the conductor stability and quench behavior. In the direct current (DC) transport case, localized
Ic
minimum can lead to the formation of a region with a higher electric field. Joule heating in such a region can disable the operational functionality of the device. Then a sufficiently detailed knowledge of the longitudinal profile of the conductor
Ic
is in the first place necessary in assessing the conductor eligibility for a specific application. In the second place, it serves to design appropriate electro-thermal stabilization, securing an effective operation, and reducing the probability of conductor degradation during the quench. We report on the experimental investigation of longitudinal
Ic
homogeneity of
CC
observed by means of transport and magnetization measurements. Basic information is the CC data from the producer on
Ic
profiles obtained with ∼1-milimeter spatial resolution by Tapestar
TM
XL. We compare it with the result obtained by multi-channel DC transport measurement with 3-millimeter spatial resolution between neighboring contacts on a multiprobe device. Then the whole sample is characterized by a complex AC susceptibility experiment. We analyze possible causes of observed discrepancies between respective methods and discuss the relevance of various techniques for the determination of longitudinal
Ic
profiles in commercial CC.
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Key words
High-temperature superconductor (HTS),characterization of conductors,critical current measurement,magnetic susceptibility
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