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

  1. [해외논문]   Pinning Properties of PLD-Obtained GdBa2Cu3O7-x Coated Conductors Doped With BaSnO3   SCI SCIE

    Chepikov, Vsevolod , Mineev, Nikolay , Abin, Dmitry , Petrykin, Valery , Pokrovskii, Sergei , Amelichev, Vadim , Molodyk, Alexander , Lee, Sergey , Samoilenkov, Sergey , Rudnev, Igor , Kaul, Andrey
    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

    This work is devoted to high-rate pulsed laser deposition of BaSnO 3 -doped superconducting films on long buffered metal tape substrates with the use of pilot-scale equipment and common deposition conditions typical for commercial 2G high-temperature superconducting wire production at SuperOx Japan. BaSnO 3 inclusions were found to grow as nanocolumns elongated along the vertical direction and having biaxial texture. With BaSnO3 doping, the angular dependence of critical current measured at 77 K became much more isotropic. At 77 K, the lift-factor (I c /I c sf ) values in BaSnO 3 -doped samples increased almost twice in 0.5-3 T magnetic field in perpendicular orientation; at the same time, the absolute critical current increased only by 10%. At 4.2 K, in 0.5-3 T perpendicular field, the absolute critical current in doped samples increased 1.8 times.

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  2. [해외논문]   Numerical Simulation of Contactless Method for Measuring $j_\mathrm{C}$ in Multiple-Layered Superconducting Film With Cracks   SCI SCIE

    Takayama, T. , Saitoh, A. , Kamitani, A.
    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

    Applicability of the scanning permanent magnet method to the measurement of the critical current density in a high-temperature superconducting (HTS) film containing a crack with the consideration of a depth has been investigated numerically. To this end, a numerical code has been developed for analyzing the shielding current density in a multiple-layered HTS film with a crack. By using the code, the scanning permanent magnet method has been reproduced numerically. The results of the computations show that the disturbed area around a crack can be quantified by the introduction of a defect parameter. Moreover, it is found that the area increases with a strength of the magnetic flux density. On the other hand, the distinction between internal and surface cracks is not always obvious since the defect parameter for an internal crack is approximately equal to its parameter for a surface crack. However, the scanning permanent magnet method proved to detect the even internal crack.

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  3. [해외논문]   Examination of the Thermal Annealing Process in Producing YBa $_{2}$Cu $_{3}$O $_{\nabla x}$ Films and Characterization of Pressure Stabilized Oxygen Chain States   SCI SCIE

    Taylor, B. J. , Emery, T. H. , Leese de Escobar, A. M. , Jeon, I. , Maple, M. B.
    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 examine the nature of thermal flow during the annealing process of a recently reported method to produce films of the high-T c superconducting compound YBa 2 Cu 3 O x wherein the oxygen content (x) spatially varies across the length of the sample. In this context, we discuss contrasting annealing results that can be expected under differing annealing configurations-including the formation of discrete regions of pressure stabilized oxygen content associated with known lattice superstructures. We also examine characteristic energy scales associated with the corresponding normal and superconducting states of these stabilized superstructures. A relationship between ratios of the superconducting gap energy, superconducting electronic kinetic energy, and the BCS-Eliashberg coupling constant associated with each lattice superstructure is found. The near integer ratios observed suggest that the superstructures can be viewed as “quantum structural” lattice states in the sense that oxygen doping levels in between are composed of a superposition of ordered structures.

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  4. [해외논문]   Effect of ZnO/TiO2 Nanorods Fabricated Using the Electrospinning Method in Y-Ba-Cu-O Single Grain Bulk Superconductors   SCI SCIE

    Chia-Ming Yang , Po-Wei Chen , Chien-Ju Liu , Shih-Yun Chen , Chang-Shu Kuo , In-Gann Chen , Maw-Kuen Wu
    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

    In this study, the enhanced superconducting properties of single grain bulk Y-Ba-Cu-O (YBCO) superconductors by the addition of ZnO and TiO 2 nano-rods (NRs) were investigated. The NRs were prepared using the electrospinning method, in which size is twice the coherence length of the superconductor and is intended supposed to serve as columnar defects to provide efficient pinning. The experimental results showed that there were no weak links formed by the addition of the NRs. All of the bulks exhibited a single grain structure, and the distribution profiles of the trapped fields were symmetrical. The value of the maximum trapped field (Bt, max) was enhanced to 0.12 T, which was 1.5 times higher than the undoped sample (approximately 0.08 T). In addition, JJ was also enhanced by the addition of the NRs. The self-field at 77 K was 4.6 χ 10 4 A cm -2 of the 0.05wt% ZnO NRsdoped and 0.1wt% TiO 2 NRs-doped samples, respectively, which was higher than that of the undoped sample of 2.5 χ 10 4 A cm -2 . A microstructural analysis demonstrated that there was no reaction occurred between the NRs and YBCO precursors during the melting process. The size and shape of the NRs found in the matrix of the grown bulk were the same as those of the precursors. Consequently, the enhanced superconductivities were then attributed to the increased interface areas between the NRs and the matrix.

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  5. [해외논문]   Comparison of Surface Flashover Characteristics of Rod and Rib Type Post Insulator for Extra-High Voltage Superconducting Fault Current Limiter   SCI SCIE

    Jae-Hong Koo (Dept. of Electron. Syst. Eng., Hanyang Univ. ERICA, Ansan, South Korea ) , Woo-Ju Shin (Dept. of Electron. Syst. Eng., Hanyang Univ. ERICA, Ansan, South Korea ) , Dong-Hun Oh (Dept. of Electron. Syst. Eng., Hanyang Univ. ERICA, Ansan, South Korea ) , Ryul Hwang (Dept. of Electron. Syst. Eng., Hanyang Univ. ERICA, Ansan, South Korea) , Bang-Wook Lee
    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

    One of the most important insulating components for developing a 154 kV superconducting fault current limiter (SFCL) is post insulator, which supports 154-kV SFCL modules in a cryostat. In order to design an optimum post insulator, the top priority is to determine the creepage distance of post insulator. In our previous research, surface flashover voltages along smooth glass fiber reinforced polymer (GFRP) rods immersed in liquid nitrogen (LN2) were experimentally investigated. To reduce the cryostat volume, ribbed post insulators with increased creepage path were then considered. However, due to difficulties with producing ribbed GFRP post insulators, ribbed specimens were made of polytetrafluoroethylene instead. Four kinds of test specimens were prepared to determine the position and the number of ribs attached to the surface. From the experimental results, it was found that the ribbed insulator has shown better insulation performance in LN2 and number of ribs could affect the surface flashover voltage of post insulator. Consequently, ribbed model for 154-kV SFCL post insulator was designed and successfully tested. Finally, real 154-kV SFCL system with newly designed ribbed post insulator was installed and Basic Impulse Level (BIL) test and ac required withstand voltage were successfully carried out.

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  6. [해외논문]   Angular Behavior of Jc in GdBCO-Coated Conductors With Crossed Columnar Defects Around ab Plane   SCI SCIE

    Sueyoshi, Tetsuro , Iwanaga, Yasuya , Fujioyoshi, Takanori , Takai, Yohsuke , Mukaida, Masashi , Kudo, Masaki , Yasuda, Kazuhiro , Ishikawa, Norito
    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 investigated in detail the flux pinning properties around B || ab for GdBCO-coated conductors with crossed columnar defects produced by heavy-ion irradiation, where the crossing angle Θi was systematically controlled in the range from ±5° to ±15° relative to the ab plane. A single peak of critical current density Jc centered at B || ab occurs for the crossing angle of Θ i = ±5°, where an upward shift in Jc can be observed compared to an unirradiated sample. As the crossing angle is larger, the Jc peak becomes smaller and broader while maintaining the peak at B || ab. Increasing Θi up to ±15°, three Jc peaks emerges at B || ab and at the two irradiation angles, independently from the others. The crossover behavior from the single peak to the triple one around the ab plane is attributed to the strong line tension energy of flux lines around B || ab , which derives from the elliptical nature of the core of flux lines in anisotropic superconductors.

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  7. [해외논문]   Critical Current Characterization of Commercial REBCO Coated Conductors at 4.2 and 77 K   SCI SCIE

    Tsuchiya, Kiyosumi , Kikuchi, Akihiro , Terashima, Akio , Suzuki, Keiko , Norimoto, Kazuki , Tawada, Masafumi , Masuzawa, Mika , Ohuchi, Norihito , Xudong Wang , Iijima, Yasuhiro , Takao, Tomoaki , Fujita, Shinji , Daibo, Masanori , Iijima, Yasuhiro
    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

    Superconducting magnets with magnetic fields of approximately 20 T will be needed for future high-energy accelerators, such as the future circular collider at CERN and/or the Muon Collider in the United States. Such field strengths exceed the levels achievable using low-temperature superconductors, such as Nb 3 Sn or Nb 3 Al. Only high-temperature superconductors can currently achieve such high field strengths. However, there has been a little research published on the electrical transport properties of REBCO coated conductors in high-field low-temperature magnet applications. Thus, we have started the critical current characterization of commercially available REBCO-coated conductors in fields of up to 18 T at 4.2 K. This paper reports some of the critical current measurement results at 4.2 and 77 K for conductors from four different manufacturers: Fujikura Ltd.; SuNAM Co. Ltd.; SuperOx Japan LLC; and SuperPower Inc.

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  8. [해외논문]   Vortex Pinning Properties at Grain Boundary in SmBa2Cu3 ${\text{O}}_{y}$ Superconducting Films With BaHfO3 Nanorods Controlled via Low-Temperature Growth   SCI SCIE

    Miura, Shun , Ichino, Yusuke , Yoshida, Yutaka , Ichinose, Ataru , Tsuruta, Akihiro
    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 investigated the effect of the BaHfO 3 (BHO) nanorods' configuration on transport properties at artificial grain boundaries (GBs) in SmBa 2 Cu 3 O y (SmBCO) superconducting films. To control the nanorods' configuration at the GBs, we deposited 3.0 vol.% BHO-doped SmBCO films on 5° [001]-tilt bicrystal (LaAlO 3 ) 0.3 (SrAl 0.5 Ta 0.5 O 3 ) 0.7 substrates at relatively low growth temperature of 750 °C via the pulsed laser deposition method adopting a seed layer technique. According to the transport results, the critical current density (J c ) at the GBs was improved in the films with the nanorods at low magnetic fields. In addition, field angular dependence of Jc was also improved for a wide range of field directions with a broad peak for B//c. We estimated that the BHO nanorods in the GBs pinned the Abrikosov-Josephson (AJ) vortices with various directions in the GBs. AJ vortex pinning can be controlled by configuration of a pinning center at GB.

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  9. [해외논문]   The Bundle-Barrier PIT Wire Developed for the HiLumi LHC Project   SCI SCIE

    Bordini, Bernardo , Ballarino, Amalia , Macchini, Matteo , Richter, David , Sailer, Bernd , Thoener, Manfred , Schlenga, Klaus
    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

    For the HiLumi Large Hadron Collider Project, CERN is developing dipole and quadrupole magnets based on state-of-the-art high-J c Nb 3 Sn wires that are expected to operate at 1.9 K and at fields larger than 11 T. Two different types of Nb 3 Sn wires are considered for the project: the powder in tube (PIT) and the restacked rod process conductors manufactured, respectively, by Bruker-EAS and Oxford superconducting technology. During the last 18 months, CERN and Bruker-EAS have being collaborating to develop a new variant of the PIT conductor in order to further improve its electromechanical properties. This collaboration led to the introduction of an additional Nb barrier around the whole bundle of filaments that allowed drastically reducing the effect of mechanical deformation and of the heat treatment cycle on the residual resistivity ratio (RRR) of the stabilizing wire copper. Furthermore, the new wire has already a slightly larger engineering critical current density with respect to the previous generation of PIT wire and it has the potential to further improve. In this paper, the bundle-barrier PIT wire is presented together with the critical current, magnetization, and RRR measurements carried out at CERN to: characterize its electro-mechanical properties; quantify the effect of the filament size on the critical current performance and; study the effect of the heat treatment cycle.

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  10. [해외논문]   Characterization of Critical Current Distribution in Roebel Cable Strands Based on Reel-to-Reel Scanning Hall-Probe Microscopy   SCI SCIE

    Higashikawa, Kohei (Robinson Res. Inst., Victoria Univ. of Wellington, Lower Hutt, New Zealand) , Xiang Guo , Inoue, Masayoshi , Zhenan Jiang , Badcock, Rodney , Long, Nicholas , Kiss, Takanobu
    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 characterized the local critical current distribution in 2-mm-wide Roebel cable strands using reel-to-reel scanning Hall-probe microscopy (RTR-SHPM). Roebel cable is an equally transposed cable formed from coated conductor architectures that is promising for large current applications. Local spatial critical-current uniformity becomes a crucial issue for the thermal stability of high-current windings. In general, the one-dimensional longitudinal critical-current distribution in coated conductors has been characterized by TAPESTAR as a de-facto standard method. However, it has proved to be difficult to use this method to achieve sufficient quality control of Roebel strands because of the unavailability of information on current flow across the width at a transposition. Furthermore, the lack of spatial resolution across the width becomes a problem for narrower strands. In this study, we applied RTR-SHPM for the characterization of Roebel strands. By scanning a Hall senor across the width of a conductor that was moving in a longitudinal direction, a high spatial-resolution two-dimensional distribution of magnetic field can be obtained for long-length conductors. This enabled us to estimate the local critical current, including the dependence on effective strand width, as a function of a longitudinal coordinate. This information is critical to the optimization of the fabrication processes and for nondestructive quality assurance of long-length Roebel strands.

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