Research on Characteristics of Superconducting Magnetic Shield Repair Technology

The high temperature superconducting shield is primarily ceramic, and has high brittleness. In practice, there may be a slit, which may easily cause electromagnetic wave leakage. The research purpose is to identify a suitable repair solution for slits on superconducting magnetic shields. Firstly, slits on the YBCO magnetic shield are repaired by using four methods of using iron or copper materials directly filling and externally covering a hollow cylindrical iron or copper shield. Then, shielding effectiveness and repair efficiency of the YBCO shield are compared. It is noted that the frequency of the excitation source, the location of the slit and the repairing method all affect the repair effect of the magnetic shield. The results show that at low frequencies, the YBCO shield with slits is repaired with a hollow cylindrical shield of iron material on the outer cover and at the high frequency, the outer cover of the YBCO shield with slits is the hollow cylindrical shield repair of the copper material greatly improves the shielding effectiveness of the YBCO magnetic shield.