Abstract
Bi(Pb)-Sr-Ca-Cu-O superconducting tubes with different wall thicknesses were fabricated to examine the wall thickness dependence of the magnetic shielding property. The external magnetic flux density, at which the flux starts to penetrate into the tube center, is referred as the shielding magnetic flux density. The shielding magnetic flux density was increased logarithmic with increasing the wall thickness. The wall thickness dependence of the shielding magnetic flux density was calculated using the critical state model in consideration of the magnetic field dependence of the critical current density. This calculated dependence agreed with the experimental one approximately.
