Abstract
The trapped field profile of large melt textured superconductors is analyzed. Whereas severe inhomogeneities, which result in several maxima in the field profile, are easily detected, it is difficult to extract information on minor inhomogeneities from a “smooth” trapped field profile due to the bad condition of the corresponding mathematical problem, i.e. the inversion of the Biot–Savart law. Numerical calculations of the trapped field profile with the J c(B) data obtained from a small reference sample, agree reasonably well with the experimental data, but cannot account for effects related to inhomogeneities caused by the growth process: the trapped field profile of a cylindrical sample is usually quadratic rather than circular and its absolute values are higher at the top side, where the seed was located. These inhomogeneities are investigated by a simplified inversion of the Biot–Savart law. We find a dependence of the current both on the radial and the axial distance from the seed. More detailed information about the inhomogeneity in the surface layer is obtained from the response of the sample to the local magnetic field induced by a small permanent magnet.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
