300-kJ pulsed superconducting energy storage coil

The design of a 300 kJ superconducting pulsed energy storage coil is reported. The coil is a solenoid and will operate at a central flux density of 2.0 Wb/m2 and a current of 10 kA. The critical current, as measured by extrapolation along the peak field load line, is 15 kA. The structure, which is completely non-conducting, was designed mechanically so that the coil may be operated at 12 kA. The windings are partially potted and are cooled on one face of the braid. The coil was designed to remain superconducting throughout the 10 s charge period and the 2 ms discharge period. The repetition period is 30 s