Voltage–Current Characteristics of HTSC Tapes under Pulsed Current Injection

The results of pulsed measurements of the current–voltage characteristics of tapes based on high temperature superconductors are presented. A model was developed that describes the features of their formation at liquid nitrogen temperature. It is shown that, at currents significantly exceeding the critical current, stable states arise that possess a pronounced hysteretic character. The analysis carried out makes it possible to predict the behavior of the superconductor under operation at alternating current. The results discussed should be taken into account when designing large-scale superconducting magnetic systems, such as magnet coils for controlled thermonuclear fusion, which are subject to intense electromagnetic disturbances.