Abstract
This paper describes the numerical and experimental superconducting levitation forces of a single-grained Y-Ba-Cu-O bulk superconductor approximately 48mm in diameter. The experimental levitation forces were measured by changing the magnet radius systematically. It was experimentally found that the levitation force shows a maximum when the magnet radius is slightly smaller than the superconductor radius. Comparison of the experimantal and numerical levitation forces showed that even large bulk superconductors have macroscopic Jc as high as 2.0×104A/cm2, not much different from the microscopic Jc.
