Персона: Покровский, Сергей Владимирович
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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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Покровский
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Сергей Владимирович
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- ПубликацияТолько метаданныеInfluence of ultrashort laser drilling on magnetic and transport characteristics of HTS tapes(2019) Pokrovskii, S, V.; Mavritskii, O. B.; Egorov, A. N.; Mineev, N. A.; Timofeev, A. A.; Rudnev, I. A.; Покровский, Сергей Владимирович; Маврицкий, Олег Борисович; Егоров, Андрей Николаевич; Тимофеев, Алексей Афанасьевич; Руднев, Игорь АнатольевичWe investigated the magnetic and transport characteristics of second generation high-temperature superconducting (HTS) tapes with an ordered array of antidots. We have performed modification of HTS GdBa2Cu3O7-delta industrial tape produced by SuperOx (Russia) using femtosecond laser exposure. We have created a local lattice of defects with the period 50 mu m and the size of every hole up to 1 mu m. We studied the dependence of the critical current on magnetic field and the angular dependence of the critical current. The influence of the array of artificial defects on the pinning force was shown in a wide range of magnetic fields. Transport and magnetization measurements reveal that these modifications of HTS tapes increases the trapped magnetic field and the critical current. The local increase in the critical current reaches 49%. These enhancements of the critical current have been observed in the intermediate angles. The proposed method of antidot arrays by laser drilling can be used for local modification of HTS tapes, and can improve the current-carrying characteristics of industrial tapes.
- ПубликацияТолько метаданныеMagnetometry Diagnostics of Defects in High-Temperature Superconducting Tapes in a Gradient Magnetic Field(2019) Podlivaev, A. I.; Pokrovskii, S. V.; Anishchenko, I. V.; Rudnev, I. A.; Подливаев, Алексей Игоревич; Покровский, Сергей Владимирович; Мартиросян, Ирина Валерьевна; Руднев, Игорь Анатольевич© 2019, Pleiades Publishing, Ltd. Abstract: A new technique for contactless magnetometric determination of the local critical current in high-temperature superconducting tapes is proposed. In contrast to conventional approaches, where currents in a superconductor are induced by a uniform magnetic field of an external source, in our variant the tape is magnetized by a series of bipolar permanent magnets. It is shown that, for solving a number of technical problems of defect diagnostics, the proposed approach is more effective than those used earlier. Two variants of diagnostics are discussed. The first variant is intended for express diagnostics of local defects (first of all, transverse cracks) in a separate tape and in a tape stack and the second variant is developed for the case of a smooth critical current variation in a separate tape. The proposed method can significantly improve the accuracy of determining the local critical current density.
- ПубликацияТолько метаданныеNonequilibrium States in HTS Tapes under the Action of Short Current Pulses(2019) Pokrovskii, S. V.; Bura, A. A.; Anishchenko, I. V.; Rudnev, I. A.; Покровский, Сергей Владимирович; Мартиросян, Ирина Валерьевна; Руднев, Игорь Анатольевич© 2019, Pleiades Publishing, Ltd.This paper presents the results of studying the nonequilibrium processes in second generation HTS tapes under the action of pulsed current loads. In the study, we used short current pulses of various amplitudes from 0.9 to 5 values of the superconductor critical current. The minimum rise time of the current was 8 µs, and the pulse duration was from 1 to 250 µs. Comparisons in the behavior of samples under long current pulses with current rise time more than 3 ms were carried out. A qualitative difference in the formation of an nonequilibrium state during short and long current pulses was found. A stable current flow with amplitudes up to 4 times larger than the critical current was obtained without degradation of the superconductor. Experimental results were analyzed on the basis of the dynamic resistance model in the flux flow regime.
- ПубликацияТолько метаданныеModification of a Second-Generation HTS Tape Based on GdBCO(123) under Pulsed Electron Beam Irradiation(2019) Minaev, I. M.; Troitskii, A. V.; Ponomarev, A. V.; Mikhailova, G. N.; Anishchenko, I. V.; Pokrovskii, S. V.; Rudnev, I. A.; Мартиросян, Ирина Валерьевна; Покровский, Сергей Владимирович; Руднев, Игорь Анатольевич© 2019, Allerton Press, Inc.Samples of composite second-generation high-temperature superconducting (HTS) tapes based on the GdBCO (123) compound have been irradiated in a pulsed electron accelerator (system Terek-2, GPI RAS) through a tantalum target in order to determine how the thermal and shock loads arising on the tantalum-HTS interface affect the superconducting parameters of HTS tapes. Scanning Hall magnetometry was applied to characterize HTS samples subjected to electron irradiation. The thermal modes and shock load in a composite superconductor under irradiation are estimated as functions of the energy absorbed by the target. At a silver surface temperature equal to the melting point, the critical current decreases by 87% from the initial value. At lower irradiation energies, the decrease in the critical current is smaller. The role of the temperature effects and shock waves under this irradiation is discussed.