Electrical Switch Contact Resistance at 4.2°K
In the use or the testing of superconducting coils, the experimenter often provides a switch of extremely low resistance to short-circuit the coil and operate it in a persistent mode. In small coils, this type of switch is constructed of a superconductor which can be switched between the superconducting and normal resistance state, For large coils, such a switch, using a superconductor in its normal resistance state, results in a large amount of energy loss during the charging of the. coil. This can be shown in a rather general way.
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