Influence of Flux Diverter on Energy Storage Property of Small SMES Magnet Wound by 100-m-Class GdBCO Tape

Solenoid-type superconducting magnetic energy storage (SMES) magnets have strong anisotropic field dependence. To enhance the minimum critical current located at two end, a novel flux diverter with a raised edge is investigated in this paper. Five small solenoid magnets having different axial layers and a fixed tape usage are used to evaluate and compare the effects of the raised-edge diverters on self-inductance, minimum critical current, and maximum energy storage capacity. An energy storage parameter K
_E
(J/m) obtained by dividing the maximum energy storage capacity by the tape usage, and an available energy parameter E
_use
(J) at a fixed rated output current are introduced to evaluate the overall economical efficiency and to form some design guidelines for various small SMES magnets.