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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- ПубликацияОткрытый доступGdBCO (123) HTS 2G tapes superconducting characteristics investigation under the pulsed electron beam exposure impact(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.
- ПубликацияОткрытый доступNumerical simulation of the fast processes in HTS tapes under the pulsed current load(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.
- ПубликацияОткрытый доступThe dynamic processes in second generation HTS tapes under the pulsed current and magnetic impact(2019) Anishchenko, I. V.; Pokrovskii, S. V.; Rudnev, I. A.; Мартиросян, Ирина Валерьевна; Покровский, Сергей Владимирович; Руднев, Игорь Анатольевич© Published under licence by IOP Publishing Ltd.This paper presents the results of complex multiphysical modelling of non-equilibrium states arising in high-temperature superconducting composites under current, magnetic, and combined control switching impacts types. The simulation and analysis of the dynamics of electrophysical and thermal processes occurring in the HTS composites layered structure taking into account the influence of local thermal processes in the composite structure, in particular, heat generation bursts during a pulse, has been performed. The HTS composite switching times from the superconducting to the normal state have been investigated for various current pulses amplitudes in homogeneous magnetic fields. An experimental verification of the numerical model has been carried out.
- ПубликацияОткрытый доступEnergy losses in magnetic contactless bearings on the base of high-Tc superconducting tapes(2019) Rudnev, I. A.; Podlivaev, A. I.; Osipov, M. A.; Abin, D. A.; Anishchenko, I. V.; Pokrovskii, S. V.; Руднев, Игорь Анатольевич; Подливаев, Алексей Игоревич; Осипов, Максим Андреевич; Абин, Дмитрий Александрович; Мартиросян, Ирина Валерьевна; Покровский, Сергей Владимирович© 2019 Published under licence by IOP Publishing Ltd.Higherature superconducting tapes are very promising for application in rotary magnetic bearings owing to its excellent magnetic and transport properties as well as possibility to easy create magneto-levitation systems of various geometry. One of problem arising in the rotation superconducting bearings is the presence of the energy loss resulting from the magnetization hysteresis due to inhomogeneity of magnetic field from permanent magnets. In this report we present results theoretical studies of rotation losses in the model superconducting bearing based on commercial high temperature superconducting (HTS) tape. The bearing stator has a cylindrical shape and is made of a multilayer HTSC tape. The bearing rotor is made of permanent magnets located at the same radius relative to the axis of rotation. As a result of numerical calculations carried out in the framework of the critical state model, the rotor geometry was established, at which the value of energy losses was minimal.
- ПубликацияОткрытый доступSimulation of magnetization and heating processes in HTS tapes stacks(2019) Anishchenko, I. V.; Pokrovskii, S. V.; Rudnev, I. A.; Мартиросян, Ирина Валерьевна; Покровский, Сергей Владимирович; Руднев, Игорь Анатольевич© Published under licence by IOP Publishing Ltd.In this work we present a computational model for a magnetic levitation system based on stacks of 12 mm x 12 mm second generation GdBa2Cu3O7-x high temperature superconducting (HTSC) tapes. In our model we have used the magnetic and transport characteristics of real industrial HTSC tapes. The thermal properties of each layer of high-temperature superconducting tape and the features of the layered structure of whole stack have also been taken into account. The numerical simulation was performed using the finite element method. Distributions of both magnetic field throughout the space and the current in every tape of the stack were calculated for two cases: (i) cryocooler cooling mode and (ii) cooling in the liquid nitrogen. The magnetization curves of the stacks in external field of a permanent NdFeB magnet and levitation force dependence on the gap between the magnet and the HTS tapes stack in these cooling modes were obtained. We have calculated heat transfer and temperature distribution in the system taking into account the effect of thermal properties of Hastelloy substrate, as well as Cu and Ag stabilization layers on the cooling process and dynamic magnetization. Simulation results were compared with the experimental data and a good agreement with numerical ones was shown.
- ПубликацияОткрытый доступSimulation of thrust magnetic bearings for levitation systems(2020) Anishchenko, I. V.; Pokrovskii, S. V.; Rudnev, I. A.; Мартиросян, Ирина Валерьевна; Покровский, Сергей Владимирович; Руднев, Игорь Анатольевич© Published under licence by IOP Publishing Ltd.This work presents the complex results of the FEM H-formulation modeling of the thrust magnetic bearing based on 2G HTS tapes. The simulated bearing consists of the HTS stator and PMs rotor. In the model we have used the magnetic and transport characteristics of industrial GdBa2Cu3O7-x superconductors and also took into account the thermal properties of each layer of high-temperature superconducting tape and the features of the layered structure of the whole stack. The numerical simulation was performed using the finite element method. The developed model feature is a direct magnetic assembly rotation simulation. Load characteristics and losses in the system at several operating temperatures were obtained. Comparison with the experimental results was done.