Abstract
A simple kind of magnetic flux pump, consisting of a small superconducting coil L 1 in parallel with a superconducting magnet L 2, has been constructed and tested. The device is attached to the secondary of a transformer and the entire assembly rests in a liquid helium bath. Persistent currents in L 2 are generated by a power supply which can be made particularly simple if an axial magnetic field H b is applied to L 1 to make its critical current sense-dependent. Circuits analysis shows that the rate of flux pumping is dependent on the magnitude of the power supply output and the final persistent current level is related to H b . These results are confirmed by experiments in which several circuit parameters were varied. A typical experiment generated 35 A in a small magnet in about 10 minutes. Suggestions are made for improvements on this behaviour.
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