On the Multiple-Ring Coil System for SMES
A new coil system named “multiple-ring coil system” for the intermediate SMES is proposed. This system consists of concentric multiple low aspect ratio coils in which the direction of current is opposit to those of adjacent coils. Characteristic features of this system such as the reduction of hoop force acting on the coil conductor, total force on them and leakage magnetic field are discussed in comparison with a single solenoid system and a toroidal coil system. A conceptual design for an intermediate scale SMES of 100MWh shows that this system has advantages of the small hoop stress and the small leakage magnetic field to the single solenoid system and an advantage of the small total force to the toroidal coil system.
KeywordsTotal Force Hoop Stress Coil System Superconducting Magnet Energy Storage Leakage Field
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