Abstract
The force-balanced coil using multi-helical variable pitch windings for generating the high magnetic field and applying to Superconducting Magnetic Energy Storage is proposed. This toroidal-poloidal field hybrid coil for the torus-type superconducting magnetic device can be made capable of not only greatly reducing the global electromagnetic forces in the major radius direction, but also dispersing the local over-concentration of forces with variable pitch windings. The computer code that calculates the windings pitch of the force-balanced coil by disassembling the current density to both toroidal and poloidal directions and optimizing the current distribution is developed. The feasibility of this idea was verified through the model experiments.
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