抄録
There is no disturbance-free superconducting coil. The disturbance gives the temperature rise of the superconductor, and the normal transition occurs when the temperature of the conductor exceeds its current sharing temperature. If the superconducting coil is stabilized adequately in some way, the normal zone does not appear, or the created normal zone disappears by itself. But if not, the normal zone propagates and the coilgets to quench. When a superconducting coil is used in some system, it is to be designed as a reliable and stable coil so as not to raise quench and not to lower the efficiency of the system operation. High stability can be achieved by giving a lot of coolant in the coil and giving a large amount of substrate to the superconductor, both of which lower the compactness or the performance of the coil. In order to get stable and compact superconducting coils, many stabilization methods have been thought out. In this paper, major cryogenic stabilization methods are explained and the problem about magnetic instabilities in superconductors is not discussed assuming that finemulti-filamentary strands are used as constituents of the conductors.
