Михайлов Б.П., Никулин В.Я., Силин П.В., Михайлова А.Б., Минеев Н.А., Гайда Д., Шамрай В.Ф. «Влияние условий ударно-волнового воздействия плазмы на структуру и токонесущую способность многослойных высокотемпературных сверхпроводящих лент» Перспективные материалы, № 10, с. 70-75 (2013)

The article presents the results of the investigation of the influence of shock-wave effects on the structure and the critical currents of multilayer high-temperature superconductors – HTS tapes produced by the EAS-E HTS (VAC). Shock-wave exposure was carried out using an installation such as a plasma focus (PF). It was experimentally found the increasing of the critical current by 20% or more in its own magnetic field and the external magnetic fields in the range 0.5–2.5 T. The increasing depends on the conditions of the shock-wave treatment (the distance from a plasma source (PF anode) and the number of shock wave pulses). In the magnetic fields of more than 3 T the effect of increasing of the critical current is not observed. Microstructural studies have revealed both a seal and destruction of the individual layers of HTS in the strike zone depending on the conditions of the impact. The most severe degradation of the structure and the critical current is shown on the tape samples treated at distances 25–30 mm from the PF anode. At the distance of 35–65 mm, the critical current increases and exceeds the reference values of untreated tapes (75–85 A). After the shock-wave treatment the phase composition of HTS layers by XRD little changed. Depending on the amount of shock pulses and distance from the anode the in the area of SW impact the tape thickness is reduced due to the compression or is increased due to swelling of the tape.