Critical currents of NbTi tapes with differently oriented anisotropic defects

In the paper we present a theory predicting the angular dependence of the critical current in NbTi tapes with elongated defects of different orientation with respect to the tape axis. Corresponding experiments were carried out on samples made from two NbTi foils with different critical current densities.The role of the self-field as well as of the small additional perpendicular field on the critical current is also investigated.