Abstract
The principle and a model coil of the shielded pulse superconductive magnet energy storage are described. This method with the shield coil has two coils, that is, a superconductive coil and a conventional normal conductor coil. These coils are connected in parallel electrically and couple magnetically. The pulse current with the energy transfer flows only into the shield coil. The superconductive coil is stable because only the dc current flows into it in any pulse operations.
The stored energy of the model coil is 200kJ at the current of 1, 350A. The diameter of the superconductive coil is 60cm. The available energy is designed to be 50kJ and the maximum transfer time is 0.1sec.. The superconductive coil is wound with usual monolithic wire and is not designed for pulse operation.
The shield coil is divided into 12 blocks for the easy construction. These blocks are distributed to obtain a optimum magnetic field shielding effect. The field measurement shows that the construction with block distribution is favorable.
The wall of the cryostat is made as thin as possible to obtain the good coupling between two coils, and the cryostat has a good thermal insulation property. The cooling test of the superconductive coil shows the heat leak of 1.6W for the cryostat, which agrees well with the design value.
