A Novel Magnet for AC Loss Measurements on 2G Superconductor Rings and Coils in Axial and Radial Magnetic Fields

A dual-solenoid magnet system was designed and fabricated for characterizing high temperature superconducting tapes and coils. The magnet coils were made of copper wire and were fabricated using a new winding approach, which enables multi-layer and epoxy-free coils. It was demonstrated that the magnet system provided a uniform AC magnetic field in radial and axial orientations on superconducting rings fabricated from 40 mm wide second generation (2G) high temperature superconducting tape. AC losses were measured on the superconducting rings with variable frequency AC magnetic field applied in both the radial and axial orientations. The versatility of the magnet and the AC loss measurement system is useful for generating the necessary AC loss data for applications such as transformers, inductive fault current limiters, and magnetic shields.