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IEEE transactions on applied superconductivity : a... 147건

  1. [해외논문]   Numerical Simulation of Nanorod Growth in REBa2Cu3Oy Superconducting Thin Films   SCI SCIE

    Ichino, Yusuke , Yoshida, Yutaka
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 4 , 2017 , 1051-8223 ,

    초록

    Various nanostructures consisting of BaMO 3 (BMO) self-organize in REBa 2 Cu 3 Oy (REBCO) films prepared by vapor phase epitaxy. A numerical simulation of the BMO self-organization was developed using the three-dimensional Monte Carlo (3D-MC) method, and the effects of deposition parameters such as substrate temperature (T s ), deposition rate (v dep ), and BMO volume fraction (f BMO ) on BMO self-organization were investigated. We consider only the kinetic factors and ignore mismatch strain on the nanorods (NRs) morphology. 3D-MC simulations for various T s indicated that the number density of BMO NRs decreased with an increase in T s , and this tendency was similar to previous experimental results for BaHfO 3 -doped SmBCO films prepared by the pulsed laser deposition method. The effects of v dep and f BMO were also simulated to provide contour plots of the number density of NRs with respect to T s and f BMO at various v dep . Phase diagrams of nanostructures consisting of BMO with various v dep were also obtained. Although these results do not take into account degradation of the superconducting properties and crystalline defects induced by nonoptimized conditions, they are considered to be a useful guideline for control of the flux pinning landscape on REBCO-coated conductors.

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  2. [해외논문]   Study of Heat Localization in HTS Wires at Overload Conditions   SCI SCIE

    Vysotsky, Vitaly S. (Russian Sci. R&D Cable Inst., Moscow, Russia) , Zanegin, Sergey Yu , Fetisov, Sergey S. , Ryabov, Sergey M. , Zubko, Vasily V.
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 5 , 2017 , 1051-8223 ,

    초록

    A common problem of superconducting devices is to survive during a fault with a current overload. At a fault, superconducting device will have strong overheating and burning out is possible. The problem becomes more serious in case if a high-temperature superconducting (HTS) wire has a weak point where the critical current is less than the average over a wire. Such a weak point could be the point of origination of strong overheating within a very localized area. This can lead to burning and destroying of an HTS device. To study this problem, we developed the experimental setup with the spatial resolution 2 mm and the time resolution 1 ms to observe a local temperature/voltage evolution in HTS tapes overloaded by currents. The preliminary experiments were performed to measure local heat/voltage development on 2G HTS tapes with an artificial weak point. Local heat/voltage evolutions have been measured and compared with calculations by our model developed earlier.

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  3. [해외논문]   Enhanced Pinning Properties of GdBa2Cu3O7-δ Films With the Gd 2O3 Nanoparticles   SCI SCIE

    Won-Jae Oh , Jae-Eun Kim , Sang-Im Yoo
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 5 , 2017 , 1051-8223 ,

    초록

    We tried to optimize the pinning properties of GdBa 2 Cu 3 O 7-δ (GdBCO) films with the Gd 2 O 3 nanoparticles. The GdBCO films with the Gd 2 O 3 contents of 0, 2, 5, 7, and 10 mol% were fabricated on CeO 2 -buffered MgO (100) substrate by pulsed laser deposition. Among these samples, 5 mol% (= 2.2 vol%) Gd 2 O 3 -doped GdBCO film exhibited the highest critical current density (J c ) values compared with other samples at temperatures of 20 and 40 K for B//c, and it also showed the maximum pinning force density (F p,max ) value of 119 GN/m 3 near 3.8 T at 20 K, indicating that 5 mol% Gd 2 O 3 is the optimum doping content below 40 K. However, the Gd 2 O 3 nanoparticles were ineffective for flux pinning at higher temperatures (>65 K). Analysis by transmission electron microscopy for this sample revealed that the Gd 2 O 3 nanoparticles of ~20 nm in diameter randomly dispersed in the GdBCO matrix. This peculiar pinning characteristics of 2.2 vol% Gd 2 O 3 -doped GdBCO film in comparison with 2.5 vol% Y 2 O 3 -doped YBCO film [P. Mele et al. 2007] are attributable to more severe degradation of Tc,zero and also to much larger particle size of Gd 2 O 3 compared with that of Y 2 O 3 nanoparticles (~8 nm).

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  4. [해외논문]   Epitaxial Growth of CeO2 Buffer Layers on IBAD-Textured MgO Templates by Pulsed Laser Deposition   SCI SCIE

    Kyung-Pil Ko , Soon-Mi Choi , Won-Jae Oh , Insung Park , Seung-Hyun Moon , Sang-Im Yoo
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 5 , 2017 , 1051-8223 ,

    초록

    Epitaxial growth of CeO 2 buffer layers on the ion-beam assisted deposition (IBAD)-textured MgO templates could be successfully achieved by an annealing heat treatment prior to CeO 2 deposition by pulsed laser deposition (PLD). The annealing process was performed in a tube furnace (ex-situ annealing) or in a PLD chamber (in-situ annealing). Analyses by x-ray photoelectron spectroscopy on the surface of ex-situ annealed MgO single crystals revealed that Mg(OH) 2 formed on the MgO surface in air was gradually decomposed into MgO with increasing annealing temperature and period. The CeO 2 layer on the IBAD MgO template ex-situ annealed for 6 h at 750 °C was only c-axis oriented in comparison with that on the nonannealed IBAD MgO template. However, some 45°-rotated grains were observed in the CeO 2 layer on ex-situ annealed IBAD MgO template. In contrast, in-situ annealing for 1 h at 800 °C was found effective to grow CeO 2 layer with a cube-on-cube orientation, suggesting that Mg(OH) 2 and MgCO 3 phases on the MgO surface were fully decomposed into MgO phase with (001) (a//[100]) orientation. TEM analyses supported that a high degree of biaxial alignment of CeO 2 layer was deposited on in-situ annealed IBAD MgO template.

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  5. [해외논문]   Properties of Fe(Se, Te) Bicrystal Grain Boundary Junctions, SQUIDs, and Nanostrips   SCI SCIE

    Sarnelli, Ettore , Nappi, Ciro , Camerlingo, Carlo , Enrico, Emanuele , Bellingeri, Emilio , Kawale, Shrikant , Braccini, Valeria , Leveratto, Alessandro , Ferdeghini, Carlo
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 4 , 2017 , 1051-8223 ,

    초록

    We have fabricated and characterized single junctions, dc Superconducting Quantum Interference Devices (SQUIDs), and nanostrips made by Fe(Te, Se) superconductive thin films. SrTiO 3 bicrystal substrates with different misorientation angles have been used for the fabrication of Josephson junctions and SQUIDs. Nanostrips have been realized growing thin films on CaF 2 substrates. The interaction between fluxons and antifluxons has been taken into account for the evaluation of the pinning energy values.

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  6. [해외논문]   Fabrication and Physical Properties of Polycrystalline Iron-Chalcogenides Superconductors   SCI SCIE

    Fiamozzi Zignani, Chiarasole , De Marzi, Gianluca , Grimaldi, Gaia , Leo, Antonio , Guarino, Anita , Vannozzi, Angelo , della Corte, Antonio , Pace, Sandro
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 5 , 2017 , 1051-8223 ,

    초록

    Iron-based superconductors are an interesting class of materials that have attracted significant interest during the last years, and which could be employed in a variety of potential applications due to their high upper critical field H c2 . In order to exploit the properties of these materials for practical applications, in this paper we explore two different routes for the fabrication of polycrystalline samples belonging to 11-family. In particular, the influence of dedicated heat treatments has been investigated to optimize their overall superconducting properties. Then, we compared the pinning properties of these two types of samples to correlate the fabrication process with the pinning landscape. The final aim is to obtain an increased T c and H c2 , as well as an enhanced pinning efficacy, which could lead to higher critical current density J c relevant for practical uses.

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  7. [해외논문]   Full Magnetization of Bulk (RE)Ba2Cu3O7−δ Magnets With Various Rare-Earth Elements Using Pulsed Fields at 77 K   SCI SCIE

    Difan Zhou , Yunhua Shi , Wen Zhao , Dennis, Anthony R. , Beck, Michael , Ainslie, Mark D. , Palmer, Kysen G. B. , Cardwell, David A. , Durrell, John H.
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 4 , 2017 , 1051-8223 ,

    초록

    REBa 2 Cu 3 O 7-δ bulk superconductors are able to trap large magnetic fields and as a result they have potential to work as strong magnets. In this study, highly textured yttrium, gadolinium, and samarium based cuprate bulk superconductors were prepared using conventional top-seeded melt-textured growth, and magnetized by employing both field-cooling magnetization (FCM) and pulsed-field magnetization (PFM) techniques at 77 K. The same peak value of a trapped field was achieved using FCM and PFM, which means all the bulk samples were fully magnetized by using the PFM method. In addition, the magnitude of the pulsed field required to fully magnetize the bulk samples varied with rare-earth element in the (RE)BCO formulation.

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  8. [해외논문]   A Study on Electrical Characteristics of Multilayered Metallic-Insulation Coils   SCI SCIE

    Dong Gyu Yang (Dept. of Mater. Sci. & Eng., Korea Univ., Seoul, South Korea ) , Jung-Bin Song (Dept. of Mater. Sci. & Eng., Korea Univ., Seoul, South Korea ) , Yoon Hyuck Choi (Dept. of Mater. Sci. & Eng., Korea Univ., Seoul, South Korea ) , Seong-Gyeom Kim (Dept. of Mater. Sci. & Eng., Korea Univ., Seoul, South Korea ) , Yeon Suk Choi (Korea Basic Sci. Inst., Daejeon, South Korea) , Haigun Lee
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 6 , 2017 , 1051-8223 ,

    초록

    This paper presents results, both experimental and analytical, on the electrical characteristics of GdBCO singlepancake coils co-wound with a number of copper tapes as metallic insulation [multilayered metallic insulated (MMI) coil] through charge-discharge, dc pulse, and overcurrent tests. The charge- discharge and dc pulse test results for the coils demonstrated that MMI coils can be charged and discharged significantly faster than noninsulated (NI) or metallic-insulated (MI) coils. In overcurrent tests at 130 A (~1.3I c ), the MMI coils exhibited better electrical behavior than its counterpart co-wound with Kapton tape as turnto-turn insulation. The charging-discharging delay times for the MMI coils decreased with an increasing number of metal tapes within the coils. Moreover, the experimental and analytical results are in good agreement, which demonstrates the validity of a concise equivalent parallel-RL circuit model for the MMI coil. Overall, the MMI winding technique is highly promising and can provide the development of compact, mechanically robust, and selfprotecting REBCO magnets with enhanced thermal/electrical stability.

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  9. [해외논문]   Characteristic Irreversible Critical Strain Limit of GdBCO-Coated Conductor Tapes Under Various Temperature and Magnetic Field Conditions   SCI SCIE

    Gorospe, Alking , Bautista, Zhierwinjay , Hyung-Seop Shin , Oguro, Hidetoshi , Awaji, Satoshi
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 5 , 2017 , 1051-8223 ,

    초록

    Superior mechanical and electromechanical properties of the coated conductor (CC) tapes made them a viable option for coil and magnet applications. In this study, investigation on the characteristics of I c under different B, T, and ε conditions were conducted. Tensile load was applied using the Katagiri type test rig under different high magnetic field and low-temperature conditions wherein irreversible strain, ε irr was determined. The I c behavior with magnetic field of both reactive co-evaporation by deposition and reaction (RCE-DR) and metal organic chemical vapor deposition (MOCVD) processed CC tapes at different T and B were obtained. The critical irreversible strain limit ε irr of Cu-stabilized REBCO CC tape increased with decreasing temperature from 65 K down to 20 K. This behavior was resulted from the increased yield strength of the CC tape due to thermal hardening effect.

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  10. [해외논문]   Synchrotron Microtomography Investigation of the Filament Microstructure in Differently Processed Bi-2212 Wires   SCI SCIE

    Scheuerlein, Christian , Rack, Alexander , Schladitz, Katja , Huwig, Luisa
    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 5 , 2017 , 1051-8223 ,

    초록

    The Bi-2212 microstructure and porosity distribution in entire state-of-the-art multifilament wires was characterized by high-energy synchrotron X-ray absorption microtomography after meltprocessing at ambient pressure, at 100 bar overpressure, and at ambient pressure after prior cold isostatic pressing of initially identical as-drawn wires. Beyond the visualization of the Bi-2212 microstructure, the porosity distribution in the different filament bundles has been quantified. Spherical granulometry and finite percolation probability calculations have been performed in order to provide a measure for the porosity distribution and to compare filament connectivity in the axial wire direction. Possible artifacts of the microtomography (μ-CT) experiment and the possibility to estimate the effect of the Bi-2212 microstructure as seen in the μ-CT images on critical current density are discussed.

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