Magnetic shielding of the superposition of a hybrid ferromagnetic cylinder over a BPSCCO cylinder

The value of the maximum shielded magnetic flux density (B/sub s/) for a high critical temperature superconductor (HTS) cylinder was shown to be improved by the superposition of a hybrid ferromagnetic cylinder over a Bi-Pb-Sr-Ca-Cu-O (BPSCCO) cylinder. This was termed the hybrid BPSCCO superimposed cylinder. The value of B/sub s/ for the hybrid BPSCCO superimposed cylinder was found to be about 52 times greater than that of a single-BPSCCO cylinder. The value of B/sub s/ was analyzed with the use of several different models. It was found that the theoretical values of B/sub s/ agree well with experimental values. The results confirm that an important criterion was determined for use in the design of an effective shield for large chambers.