Current state of studies of shock-wave action on the structure and properties of superconductors

Abstract

Abstract The article presents the results of the action of shock waves generated by the Plasma Focus setup on the structure and critical current Jc(B) of MgB2 and Bi-2223-based superconductors. The structure of the tapes was studied in the transverse and longitudinal sections using different impact energy intensities (due to a change in the distance from the plasma anode from 20 to 50 mm for the same number of plasma pulses (n=5)). The studies showed the possibility of increasing the critical current (Jc) up to 50% in transverse and longitudinal magnetic fields to 2-3 T after plasma impact due to changes in the microstructure of the superconducting phase, including: grain refinement, interlayer compaction, microdeformations and crystal lattice defects allowing to increase the number of pinning centers of magnetic vortices.