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The distribution of the trapped magnetic field of untinned and tinned high-temperature superconductors (HTS) tapes after mechanical load on the stack of tapes was studied by the scanning Hall magnetometry method. Based on the obtained data, the values of the average critical current for all the studied samples were calculated. The degradation of the current carry capacity starts with lower mechanical loading on the stack in case of tinned tapes than of untinned ones. For tinned tapes the average value of the critical current drops by more than two times relative to initial state when a mechanical load of 400 MPa was applied; for untinned tapes – a decrease in the critical current is of less than 25%. The obtained data will be useful for further designs of current-carrying part based on stacks of HTS tapes for various applications.
Preobrazhenskiy et al. (Mon,) studied this question.