Longitudinal Critical Current Profiles in Coated Conductors Examined by Transport and Magnetization Measurements

Critical current ( I c ) 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 I c minimum can lead to the formation of a region with a higher electric field. Joule heating in such a r...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2023-08, Vol.33 (5), p.1-5
Main Authors: Mosat', M., Souc, J., Ries, R., Gomory, F.
Format: Article
Language:English
Subjects:
Characterization of conductors
Conductors
Critical current (superconductivity)
Critical current measurement
Current measurement
Direct current
Electric contacts
Electric fields
High-temperature superconductor (HTS)
Homogeneity
Integrated circuits
Magnetic field measurement
Magnetic susceptibility
Magnetization
Ohmic dissipation
Resistance heating
Spatial resolution
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Summary:Critical current ( I c ) 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 I c 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 I c 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 I c homogeneity of CC observed by means of transport and magnetization measurements. Basic information is the CC data from the producer on I c 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 I c profiles in commercial CC.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2023.3264956