Single-Grained Y-Ba-Cu-O (YBCO) high temperature superconductor (HTS) with diameler up to several centimeters has been produced. This HTS material can be used for magnetic lévitation, magnetic shielding, and field trapping magnet The materials processing techniques, such as melt4exturing and seeding of this single-grained YBCO materials will be reported. The principles regarding magnetic lévitation and trapping, such as field intensity, field distribution, super-current model, etc., in this single-grained YBCO will be discussed The effect of high energy particle irradiation on the Jc(H) and field trapping enhancement will be reported. Potential applications of large grain YBCO materials will also be discussed.
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