Experimental and numerical investigation of shielding performance of superconducting magnetic shields using coated conductor tapes

This study investigated the magnetic shielding performance of various configurations of superconducting cylinders based on high temperature superconducting Coated Conductor (CC) tapes. We applied ac magnetic fields with various frequencies and amplitudes to superconducting cylinders with CC tapes. The magnetic shielding performances of the cylinders with a variety of layer number and length of the cylinder were compared. We also performed the numerical simulations, and got the same tendency as the experimental results. We clarified that the shielding factor lineally increases with the layer number of the CC tape. More than five layers of the CC tape wound with the same orientation and angle to cover the gaps of an inner layer achieves 98% attenuation of the magnetic field. However, the simulation and experimental results show that shielding factor is not greatly improved by increasing the length of the cylinder due to the magnetic field penetration from the gaps between each winding of the CC tape. This study demonstrates a good possibility and also the limitation to use CC tapes for the magnetic shielding.