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Moscow, Russia

Moyzykh M.,Moscow State University | Samoilenkov S.,Russian Academy of Sciences | Amelichev V.,SuperOx | Vasiliev A.,RAS Research Center Kurchatov Institute | Kaul A.,Moscow State University
Journal of Crystal Growth | Year: 2013

Thin (80-800 nm) epitaxial silicon films on sapphire substrates were deposited via CVD technique and studied with XRD, SEM, EDS, EBSD, HRTEM and AFM methods. Increase of grain size, reduction of microtwin concentration and strong sharpening of crystallographic texture with increasing film thickness was observed. To our knowledge, XRD texture analysis in relation to film thickness of silicon on sapphire samples was performed for the first time. Thickness-dependent behavior of texture quality and film microstructure can be explained by the model of evolutionary selection and disclination formation. © 2013 Elsevier B.V.

Fetisov S.S.,Russian Scientific RandD Cable Institute VNIIKP | Nosov A.A.,Russian Scientific RandD Cable Institute VNIIKP | Zubko V.V.,Russian Scientific RandD Cable Institute VNIIKP | Bykovsky N.V.,Russian Scientific RandD Cable Institute VNIIKP | And 6 more authors.
Journal of Physics: Conference Series | Year: 2014

Recently launched production of 2G wires by SuperOx Company permitted us to start tests of representative models of power cable made of their wires. In Russian Scientific R&D Cable Institute we have the test facility for extensive testing of heavily instrumented HTS cable models with full size cross-section and length up to 5 m. Our standard test program includes critical current measurements, current distribution measurements among layers, AC loss measurements, etc. In this paper we present details of first power cable models made of 4 mm width 2G wires from SuperOx and their test results. Model cables have two counter-wound layers with 18 tapes in each layer. Critical currents of cables were from 3 kA to ∼4.5 kA. We also measured AC losses and compared them with losses in model cables made of 2G wires of other producers. AC losses measured were compared with calculated ones and demonstrated the good coincidence between experiments and calculations. First model cables tests permitted us to conclude that SuperOx wires have good parameters for production of 2G HTS power cables with low AC losses. © Published under licence by IOP Publishing Ltd.

Martynova I.,Moscow State University | Tsymbarenko D.,Moscow State University | Kamenev A.,SuperOx | Kuzmina N.,Moscow State University | Kaul A.,Moscow State University
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2014

The Solution Deposition Planarization method was successfully used for smoothing Ni-alloy tapes with initial surface roughness of 26.7 nm (on 40×40 μm2 area) and 12.6 nm (on 5×5 μm2 area). New precursor solutions were prepared from yttrium acetate and diethylenetriamine or ethylenediamine in MeOH and i-PrOH - alcohols with different viscosities. Using those solutions yttria films with the residual roughness Sa=0.4 nm (on 5×5 μm2 area) and Sa=7.6 nm (on 40×40 μm2 area) were deposited on the Ni-alloy tapes. © 2013 Elsevier B.V.

Patel A.,University of Cambridge | Kalitka V.,SuperOx | Hopkins S.C.,University of Cambridge | Baskys A.,University of Cambridge | And 5 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2016

Stacks of commercial higherature superconducting tape can be cut and soldered together to form slabs of a large range of shapes and sizes. They are most interesting for magnetic levitation applications due to the flexibility of geometry, allowing them to be created in large thin slabs suitable for planar rotary magnetic bearings and linear maglev bearings. In this paper, the axial levitation force was measured between a field cooled slab of 30 × 30 mm and a 25-mm-diameter rare-earth permanent magnet (PM), which produced a cylindrically symmetric field necessary in the context of rotary bearings. The force results were compared with that achieved between the same PM and a larger 43-mm-diameter bulk MgB2 disk, as well as to FEM modeling using the Perfectly Trapped Flux approximation. © 2016 IEEE.

Patel A.,University of Cambridge | Baskys A.,University of Cambridge | Hopkins S.C.,University of Cambridge | Kalitka V.,SuperOx | And 4 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2015

The potential of (RE)BCO superconducting bulks in rotating machine designs has been explored through numerous experimental prototypes, with the bulks being magnetized to act as field poles. However, stacks of superconducting tapes have emerged as a promising alternative for trapped field magnets partly because of their suitability for the pulsed-field method of magnetization, which is considered the most practical method of trapping flux. The benefits of using a stack of tapes as rotor field poles suitable for motors are reported. The ability to have a long rectangular stack allows for motor designs with more efficient field poles in terms of the flux produced per unit area of the pole and easy scalability. Such a rectangular stack was experimentally magnetized for the first time using a race-track-shaped pulsed-field coil giving a highly uniform and well-defined trapped field. The unique self-supporting 120 mm by 12 mm stack was produced by compressing a high-temperature-superconducting tape coated with a thin layer of solder. Shorter rectangular stacks were pulse magnetized over a temperature range of 10-77 K using a fully automated pulsed magnetization system. © 2002-2011 IEEE.

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