Losses analysis of HTS racetrack coil operating in an external magnetic field

The article presents the results of experimental studies of a racetrack 2G HTS winding in the presence of an external constant magnetic field. To create high-performance devices based on 2G HTS tapes, it is very important to know what transport current can be provided by HTS coils. To clarify the level of transport current of HTS coils and make accurate predictions about it, a specialized bench was created for testing straight samples and racetrack coils in the presence of a variable magnetic field. Discrete sensors are used for measuring the field components perpendicular and parallel to the tape. Measurements of losses in the coil at different values of the external magnetic field with an alternating sinusoidal and high-frequency modulated current at several frequencies and amplitudes are performed and discussed.