2023, Мартиросян, И. В., Мартиросян, Ирина Валерьевна, Руднев, И. .

2025, Мартиросян, И. В., Михайлова, И. К., Малявина, А. Ю., Покровский, С. В., Руднев, И. А., Руднев, Игорь Анатольевич, Мартиросян, Ирина Валерьевна, Покровский, Сергей Владимирович, Михайлова, Ирина Константиновна, Малявина, Александра Юрьевна

Аннотация – В данной работе представлены результаты исследований неравновесных состояний в ленточных высокотемпературных сверхпроводниках при импульсной токовой нагрузке. Для исследования переходных процессов в сверхпроводнике при критических токовых нагрузках разработана методика и создан экспериментальный стенд, позволяющий выполнять визуализацию тепловых процессов в композите при критических токовых нагрузках с высоким временным разрешением. Исследована динамика тепловых процессов в ВТСП ленте при токовых нагрузках, показаны особенности тепловых процессов, приводящих к смене режимов кипения жидкого хладагента. Изучен процесс разрушения ВТСП образца под действием сверхкритической токовой нагрузки на миллисекундном масштабе.

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.

2019, Anishchenko, I. V., Pokrovskii, S. V., Rudnev, I. A., Osipov, M. A., Abin, D. A., Мартиросян, Ирина Валерьевна, Покровский, Сергей Владимирович, Руднев, Игорь Анатольевич, Осипов, Максим Андреевич, Абин, Дмитрий Александрович

© 2019 Published under licence by IOP Publishing Ltd.This paper presents a numerical layered 2G HTS tape model with the transport current flowing through it. The simulation is performed by using FEM H-formulation method implemented in the Comsol Multyphysics software. The model provides two cooling modes: cryocooler and liquid nitrogen. LN2 cooling mode provides for a complex hysteresis character of the liquid nitrogen boiling curve and the boiling regimes changing possibility between the stationary and the bubble boiling. The delay of the voltage rising with a transport current above the critical value pulse input is shown in the liquid nitrogen cooling case. The possibility of parameters calculating for current redistribution from the HTS to the stabilizing copper layer is shown, and the stabilizing coating thickness effect on the thermal transition critical current value is studied A comparison with experimental results is carried out.

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.

2023, Мартиросян, И. В., Михайлова, И. К., Покровский, С. В., Новиков, М. С., Руднев, И. А., Руднев, Игорь Анатольевич, Покровский, Сергей Владимирович, Мартиросян, Ирина Валерьевна, Михайлова, Ирина Константиновна

Представлены результаты численного моделирования характеристик сверхпроводящего CORC-кабеля в условиях циклической синхронной нагрузки электрическим током и магнитным полем при охлаждении жидким неоном. Проведен расчет распределений магнитного поля и токов в системе, механических напряжений и деформаций, энергетических потерь, возникающих при перемагничивании магнитным полем и электрическим током. Показаны особенности электродинамических и теплофизических процессов, происходящих в системе при синхронной токовой и магнитополевой нагрузке при различных углах намотки ВТСП лент. Моделирование выполнено методом конечных элементов в пакете программного обеспечения Comsol Multiphysics. Модель ориентирована на расчет магнитной системы сверхпроводящего индуктивного накопителя энергии в составе коллайдера протонов и тяжелых ионов NICA (Nuclotron based Ion Collider fAcility), строящегося на базе Лаборатории физики высоких энергий (ЛФВЭ) им. В.И. Векслера и А.М. Балдина Объединенного института ядерных исследований (ОИЯИ).

2019, Osipov, M., Starikovskii, A., Abin, D., Pokrovskii, S., Anischenko, I., Rudnev, I., Осипов, Максим Андреевич, Стариковский, Александр Сергеевич, Абин, Дмитрий Александрович, Покровский, Сергей Владимирович, Мартиросян, Ирина Валерьевна, Руднев, Игорь Анатольевич

© 2019 International Institute of Refrigeration. All rights reserved. In our report, we present new results on investigation of the influence of temperature on the levitation force between the stacks of high temperature superconducting tapes (or coated conductor - CC tapes) and a permanent magnets. We studied the changing in value of levitation force at decreasing of temperature down to 30 K for field cooled (FC) and zero field cooled (ZFC) modes for various number of tape in the stack. In the measurements we used 12 mm wide commercially available CC-tape manufactured by SuperOx. The tapes were cut into pieces 12 mm x 12 mm. The number of layers in the stack ranged from 5 to 100. Cooling of the CC-tapes stack was carried out in cryo-free cryostat. Temperature range was from 30 to 80 K. Results showed that temperature has much influence on levitation force in ZFC mode whereas for FC mode the influence of temperature on levitation force is insignificant. The experimental data were compared with the results of calculations performed by using COMSOL Multiphysics. The obtained results are very useful for the practical application in magnetic levitation based systems.

2019, Minaev, I. M., Troitskii, A. V., Ponomarev, A. V., Mikhailova, G. N., Anischenko, I. V., Pokrovskii, S. V., Rudnev, I. A., Мартиросян, Ирина Валерьевна, Покровский, Сергей Владимирович, Руднев, Игорь Анатольевич

© Published under licence by IOP Publishing Ltd.The 2nd generation composite HTS tapes samples based on the GdBCO (123) compound were irradiated in a pulsed electron accelerator (Terek-2 facility, IOF RAS) through a tantalum target to determine the thermal and shock loads effect at the tantalum-HTS boundary on the HTS tapes superconducting characteristics. Scanning Hall magnetometry was used to characterize the HTS samples after the electron irradiation exposure. The thermal modes and shock load in a composite superconductor under the irradiation influence are estimated depending on the magnitude of energy contribution to the target. At a silver surface temperature equal to the melting temperature, the critical current value drops by 87% of the initial value. At lower energy, a weaker critical current decrease was observed. The temperature effects and shock waves roles under the irradiation is discussed.

2019, Irina, Anischenko, Sergei, Pokrovskii, Igor, Rudnev, Osipov, Maxim, Мартиросян, Ирина Валерьевна, Покровский, Сергей Владимирович, Руднев, Игорь Анатольевич, Осипов, Максим Андреевич

In many levitation systems superconductors are used in combination with permanent magnets. In this paper we considered three types of magnetic assemblies that are most often used: with magnets oriented in one direction, oppositely oriented magnets and the Halbach array. Based on the H-formalism, we performed modeling of a magnetic field and levitation force in a system consisting of the high temperature superconductor (HTS) tape stack and the assembly of permanent magnets. It was shown that if a spatial distribution of a gradient magnetic field changes in height it is necessary to take into account the magnetic history of the superconductor. The proposed computational model includes a combination of scalar and vector potentials, as well as modeling the real movement of an HTS tape stack in a levitation system. The simulation results were verified by corresponding experiments. The proposed approach is universal for modeling levitation systems of complex configurations.

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.