Design, numerical analyses and test of a 0.1 MJ SMES with low stray field

A 0.1 MJ superconducting magnetic energy storage (SMES) is designed with low stray field by FEM. By applying a shield magnet, the stray field of SMES is reduced effectively. By analyzing the magnetic field of magnet, equipotential line, distributions of magnetic flux density are obtained. The SMES magnet is tested in the liquid helium and the calculated results and the measured results are compared. Based on above analyses, a design scheme, which has both acceptable technical performance and low stray field, is derived.