Papers by Vyacheslav Solovyov
IEEE Transactions on Applied Superconductivity, 2019
Particle accelerators use a variety of low field magnets. This paper describes a recently propose... more Particle accelerators use a variety of low field magnets. This paper describes a recently proposed, novel concept of using circular superconducting coils for multipole iron-dominated magnets. This type of magnet design is most suitable for the use in high temperature superconductors (HTS), as well as in react and wind magnet technology. The HTS quadrupole magnet with 45-mm aperture and 100-mm diameter coils was designed, fabricated, and tested. The magnet design includes the choice of superconductor, three-dimensional (3-D) magnetic field optimization, and mechanical design. The magnet models were tested at the liquid nitrogen temperature. This paper presents and discusses the test results.
Journal of the European Ceramic Society, 1994
ABSTRACT The present study demonstrates the possibility of preparing Bi-based SC-ceramics with al... more ABSTRACT The present study demonstrates the possibility of preparing Bi-based SC-ceramics with almost theoretical density and high level of superconductive and mechanical properties in a short time by temperature treatment under high pressure conditions. It is shown that there is a P-T-τ-region where the 2223 phase content may be increased. The variation of unit cell volume of 2223 phase is also observed. The critical current density of the samples can be increased after the P-T-τ treatment by a factor of 25 times.ZusammenfassungDie vorliegende Untersuchung zeigt, daß es möglich ist, in kurzer Zeit mittels Wärmebehandlung und hohem Druck auf Bi basierende SC-Keramiken mit nahezu der theoretischen Dichte und einem hohen Maß an supraleitenden und mechanischen Eigenschaften herzustellen. Die Existenz eines P-T-τ-Bereichs mit möglichem, erhöhtem 2223-Phasenanteil wird diskutiert. Weiterhin konnte die Veränderung des Volumens der Einheitszelle der 2223-Phase beobachtet werden. Der kritische Strom der Proben ließ sich nach der P-T-τ-Behandlung um einen Faktor 25 steigern.RésuméNous démontrons qu'il est possible de préparer des céramiques supraconductrices à base de Bi, approchant la densité théorique, possédant d'excellentes propriétes supraconductrices et mécaniques, ceci par un court traitement thermique à haute pression. Nous montrons qu'il y a un domaine de la courbe P-T-τ dans lequel la proportion de phase 2223 peut être augmentée. Nous avons aussi observé les variations du volume de la maille élémentaire de la phase 2223. Par un traitement P-T-τ on peut multiplier le courant critique par un facteur de 25.
U.S. Department of Energy Office of Scientific and Technical Information - OSTI OAI, Oct 20, 2020
2022 IEEE Applied Power Electronics Conference and Exposition (APEC)
IEEE Transactions on Transportation Electrification
IEEE Transactions on Applied Superconductivity
Bulletin of the American Physical Society, 2016
Известия высших учебных заведений. Электромеханика, 2021
The paper offers a new approach to reduce the energy losses of robotic technological processes. R... more The paper offers a new approach to reduce the energy losses of robotic technological processes. Reducing the cost of electrical energy is reached by finding the optimal location of the complex of movements trajectories of the control program in the working space of an industrial robot. A proposed optimization algorithm allows to repeat the results of improving the energy efficiency of the robotic process and adapt them to any standard model of an industrial robot. The results of testing the algorithm are presented, demonstrating a significant potential for energy saving and determining the feasibility of using the developed tools. A graphical user interface that facilitates the procedure for setting up an energy-efficient mode for the designer of a robotic technological process has been developed
Microscopy and Microanalysis, 2019
Research over the past years has shown that proton and ion irradiation can significantly improve ... more Research over the past years has shown that proton and ion irradiation can significantly improve pinning in second-generation (2G) HTS wire by producing highly engineered defects [1-3]. However, the enhancement in Jc usually comes with a cost of depression of critical temperature Tc. The degradation can be partially recovered by post-annealing process [4]. The film quality and superconducting properties can be improved by altering the oxygen disorder and nanoscale defects after annealing. Although irradiation defects have been studied over a full range of atomic, electronic structures and physical properties, a detailed atomic level TEM analysis on the annealing effects is still needed.
Microscopy and Microanalysis, 2019
Superconductor Science and Technology, 2016
The second-generation high temperature superconductor (2G HTS) wire is the most promising conduct... more The second-generation high temperature superconductor (2G HTS) wire is the most promising conductor for high-field magnets such as accelerator dipoles and compact fusion devices. The key element of the wire is a thin Y 1 Ba 2 Cu 3 O 7 (YBCO) layer deposited on a flexible metal substrate. The substrate, which becomes incorporated in the 2G conductor, reduces the electrical and mechanical performance of the wire. This is a process that exfoliates the YBCO layer from the substrate while retaining the critical current density of the superconductor. Ten-centimeter long coupons of exfoliated YBCO layers were manufactured, and detailed structural, electrical, and mechanical characterization were reported. After exfoliation, the YBCO layer was supported by a 75 μm thick stainless steel foil, which makes for a compact, mechanically stronger, and inexpensive conductor. The critical current density of the filaments was measured at both 77 K and 4.2 K. The exfoliated YBCO retained 90% of the original critical current. Similarly, tests in an external magnetic field at 4.2 K confirmed that the pinning strength of the YBCO layer was also retained following exfoliation.
IEEE Transactions on Applied Superconductivity, 2016
We demonstrate a 2-fold increase of the in-field critical current of AMSC's standard 2G coil wire... more We demonstrate a 2-fold increase of the in-field critical current of AMSC's standard 2G coil wire by irradiation with 18 MeV Au ions. The optimum pinning enhancement is achieved with a dose of 6x10 11 Au ions/cm 2. Although the 77 K, self-field critical current is reduced by about 35%, the in-field critical current (H//c) shows a significant enhancement between 4-50K in fields >1 T. The process was used for the roll-to-roll irradiation of AMSC's standard 46 mm wide production coated conductor strips which were further processed in to standard copper laminated coil wire. The long length wires show the same enhancement as attained with short static irradiated samples. The roll-to-roll irradiation process can be incorporated in the standard 2G wire manufacturing with no modifications to the current process. The enhanced performance of the wire will benefit rotating machine and magnet applications.
Magneto-Optical Imaging, 2004
We present magneto optical studies of the critical state in YBa 2 Cu 3 O 7-δ (YBCO) thick films p... more We present magneto optical studies of the critical state in YBa 2 Cu 3 O 7-δ (YBCO) thick films prepared using BaF 2 ex-situ post reaction process. A fractal-like propagation was observed as the magnetic flux entering the superconducting films, in striking contrast to the behavior expected of a uniform type II superconducting film in the critical state. However, by averaging the flux density over a certain length scale, we found that flux penetration can be described with the standard Bean critical state model. The temperature dependence of critical current density J c was obtained by applying the Bean model to the averaged flux profiles, and found in good agreement with those obtained by direct transport measurements.
The present invention is a method for producing a crystalline end-product. The method comprising ... more The present invention is a method for producing a crystalline end-product. The method comprising exposing a fluoride-containing precursor to a hydrogen fluoride absorber under conditions suitable for the conversion of the precursor into the crystalline end-product.
This invention provides a method of making a fluorinated precursor of a superconducting ceramic. ... more This invention provides a method of making a fluorinated precursor of a superconducting ceramic. The method comprises providing a solution comprising a rare earth salt, an alkaline earth metal salt and a copper salt; spraying the solution onto a substrate to provide a film-covered substrate; and heating the film-covered substrate in an atmosphere containing fluorinated gas to provide the fluorinated precursor.
Uploads
Papers by Vyacheslav Solovyov