A Simple Method to Eliminate Shielding Currents Generated when   Magnetization is Perpendicular to Superconducting Tapes Wound into Coils
  Application of an external AC magnetic field parallel to superconducting tapes helps in eliminating the magnetization caused by the shielding current induced in the flat faces of the tapes. This method helps in realizing a magnet system with high-temperature superconducting tapes for magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) applications. The effectiveness of the proposed method is validated by numerical calculations carried out using the finite-element method and experiments performed using a commercially available superconducting tape. The field uniformity expected for practical applications is estimated to be less than 1 ppm. 
Kazuhiro Kajikawa and Kazuo Funaki
cond-mat.supr-con