Technical Physics Letters
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- 2023
- 2022
Nonequilibrium states in the second-generation HTS composites under overcritical pulsed current impact
Anischenko I.V.
1, Pokrovskii S.V.
1, Osipov M.A.
1, Abin D.A.
1, Gritsaenko D. I.1, Rudnev I. A.
1
1National Research Nuclear University “MEPhI”, Moscow, Russia
Email: mephizic@gmail.com, sergeypokrovskii@gmail.com, MAOsipov1@mephi.ru, Dima_abin@mail.ru, karbe@yandex.ru, IARudnev@mephi.ru
This paper presents the results of studying the processes of epy HTS composites switching from the superconducting to the resistive state at microsecond current pulses. Two modes of pulsed current load were used: with an amplitude of ~1.1Ic (the so-called "soft" mode) and with an amplitude of ~3Ic ("hard" mode). The possibility of passing supercritical currents through the tape without superconductor characteristics degradation is shown. To explain the processes occurring in the tape during the current pulse, 2D FEA (finite element analyzes) was developed, with the help of which the dynamic resistance of the HTS composite superconducting layer was calculated in the "hard" load mode and nonstationary processes of current redistribution between the different tape layers were demonstrated. Keywords: HTS composites, superconducting switch, nonequilibrium states, stable switching, irreversible switching.
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