Mechanical characterization of a 10-MJ HTS SMES magnet wound by quasi- isotropic strands and directly stacked tape conductors

A 10-MJ-class superconducting magnetic energy storage (SMES) magnet is designed and optimized in this study using quasi-isotropic strands and stacked-tape conductors. In order to ensure the stable operation of SMES systems, it is necessary to evaluate the mechanical properties risk caused by the Lorentz force. Therefore, in this study, the magnetic stress caused by the Lorentz force is analyzed using the finite element method. The results show that the tapes near the inner diameter of the magnet are subjected to a higher stress and require considerable support. Although the maximum stress is increased by two times due to the presence of the screening current, it is within the safety range. The screening current does not vanish after the discharge process. After discharge, the coil is still subjected to a stress on the other of a few MPa.