Study of Magnetic Shielding with Superconducting Materials II

Abstract

The necessity of magnetic shielding has been increased accompanied with the development of superconducting magnets. The shielding networks which were made of superconducting wire have been studied aiming at the practical application for the high field shielding. Cylindrical shieldings were made using superconducting networks. In the fields parallel to the shielding axis the external field of 1T could be reduced below 0.02T. In the field vertical to the axis 0.6T was decreased below 0.2T. The shielding efficiency depends on the change rate of the external field. The shielding network has shown the effective shield capability even in the graded magnetic field, because the shield current is induced corresponding to the gradient of the external field. The magnetic shielding with the superconducting networks is confirmed to be applicable to actual use.