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

  1. [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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  2. [해외논문]   Experimental and Numerical Study of Quench Characteristics of Nonuniform REBCO-Coated Conductors   SCI SCIE

    Ping Yang , Yawei Wang , Jie Sheng , Feng Wang , Derong Qiu , Wang, L. B. , Zhijian Jin , Zhiyong Hong
    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 study numerically and experimentally analyzed the quench propagation characteristics of nonuniform REBa 2 Cu 3 O 7-δ (REBCO, RE = rare earth) coated conductors (CCs) at the self-field and under a nearly adiabatic conditions. Four nonuniform REBCO CCs cases were studied: a copper-laminated sample with a point defect, a bare sample with a point defect, a copper-laminated sample with a regional defect, and a bare sample with a regional defect. The finite element method was used with the numerical computational models for these four nonuniform cases. The temperature and voltage profiles obtained from the numerical models were compared with experimental data. The quench parameters, including the peak temperatures in the defect region and normal zone propagation velocity, were obtained at various operation currents (from 36% Ic to 112% Ic). Of the four cases, the bare sample with the regional defect had the highest peak temperature at the same time and percentage of critical current (Ic). The results will be useful for the quench detection and protection design of REBCO CCs for use in applications.

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  3. [해외논문]   Properties of Multifilamentary MgB2 Wires Fabricated by Internal Magnesium Diffusion Using Amorphous and Crystalline Boron Powders   SCI SCIE

    Da Xu , Dongliang Wang , Chao Yao , Xianping Zhang , Yanwei Ma , Awaji, Satoshi , Watanabe, Kazuo
    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

    MgB 2 /Nb/Monel multifilamentary wires were fabricated using amorphous and crystalline boron powders by an internal Mg diffusion (IMD) process. The microstructure, morphology, and the critical current density (J c ) of the reacted MgB 2 layers in the multifilamentary wires made using different boron powders were analyzed and compared. The purity of boron powder influences greatly the transport properties of MgB 2 wires. The J c as high as 6.1 × 10 4 A cm -2 at 4.2 K, 10 T is obtained in the seven-core MgB 2 wire made using amorphous boron powder. The IMD-processed seven-core MgB 2 wire fabricated using high-purity crystalline boron powder has also a high J c of 4.9 × 10 4 A cm -2 at 4.2 K and 10 T. However, the seven-core MgB 2 wire prepared using low-purity crystalline boron powder has a relatively low J c compared with the others, which is expected to allow the fabrication of large-scale and low-cost superconducting wires for practical application. The further improvement of layer J c , nonbarrier J c and engineering critical current density J e is necessary because of the irregular subfilaments and the inhomogeneous thickness of the reacted MgB 2 layer in multifilamentary wires.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  4. [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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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  5. [해외논문]   Numerical Simulation of Shielding Current Density in HTS Film by Using Acceleration Technique With $\mathcal {H}$-Matrix Method   SCI SCIE

    Kamitani, Atsushi , Takayama, Teruou , Saitoh, Ayumu
    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

    Numerical techniques are proposed for fast solving a linear system appearing in the shielding current analysis in a cracked high-temperature superconducting (HTS) film. After discretized with respect to time and space, an initial-boundary-value problem of the shielding current density reduces to a problem in which a linear system is solved at each iteration of the Newton method. Although the coefficient matrix of the system is dense, a fast iterative linear-system solver can be realized by implementing the H-matrix method to matrix-vector multiplications. On the other hand, the CPU time required for the iterative solver increases with the number of elements adjacent to cracks. To remove such unfavorable characteristics, the QR factorization is applied to a part of the linear system so that all unknowns other than correction of the current vector potential may be eliminated from the linear system. The performance of the techniques is evaluated and, as an application of the techniques, detectability of multiple cracks in an HTS film is investigated numerically.

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  6. [해외논문]   Influence of Fatigue and Bending Strain on Critical Currents of Niobium Superconducting Flexible Cables Containing Ti and Cu Interfacial Layers   SCI SCIE

    Simin Zou , Rujun Bai , Hernandez, George A. , Gupta, Vaibhav , Yang Cao , Sellers, John A. , Ellis, Charles D. , Tuckerman, David B. , Hamilton, Michael C.
    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

    Niobium is a viable material for thin-film superconducting flexible microwave cables. To aid in the design of superconducting flexible cables using Nb, it is important to evaluate not only the superconductor electrical performance, but also mechanical reliability performance since these cables should be reasonably robust when flexed. In this paper, we performed fatigue and bending tests on Nb-only and Ti/Nb/Cu multilayer signal lines on flexible Kapton substrates and measured the change in critical current (I c ) of these wires. From the fatigue tests, I c , degradation of Nb-only cables occurred at a lower number of cycles than the Ti/Nb/Cu cables. After 250 fatigue cycles, Ti/Nb/Cu wires with the thickest Ti adhesion layer and Cu capping layer exhibited the lowest I c degradation of ~1.2% and 0% in tensile and compressive cases, respectively. From bending tests, where the sample was held in an intentionally curved configuration during testing, I c degradation of the Nb-only cables was more severe than that of the Ti/Nb/Cu cables during tensile bending and the I c of Ti/Nb/Cu cables was minimally affected during compressive bending. These results demonstrate that a Ti adhesion layer and Cu capping layer provide reliability enhancement for superconducting Nb flex cables fabricated on Kapton.

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  7. [해외논문]   Suitable Excitation Condition in Overshooting Process for Suppressing Magnetic Field Attenuation in Y-Based Coated Conductor Coils   SCI SCIE

    Tsuda, Makoto , Takano, Reo , Miura, Hideaki , Miyagi, Daisuke , Matsuda, Tetsuya , Yokoyama, Shoichi
    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

    In Y-based coated conductor coils, a shielding current is induced by the magnetic field component perpendicular to the broad face of the coated conductor. Since the magnetic field induced by the shielding current gradually attenuates with time, the temporally stable magnetic field required for high-resolution imaging in magnetic resonance imaging (MRI) applications is difficult to obtain. We investigated the suitable excitation conditions in an overshooting process required for suppressing the magnetic field attenuation. We fabricated a double-pancake coil composed of GdBCO tapes and measured the shielding magnetic flux density and its variation rate using Hall probes attached to the outermost layer of the coil. The variation rate of magnetic flux density decreased with the maximum coil current. The overshooting current required for zero variation rate of magnetic flux density increased with target coil current in the small coil current region, and decreased with target coil current in the large coil current region. The suitable powering conditions for the overshooting process could be obtained by considering the relationship between the final operating current of the coil, the shielding magnetic flux density, and the required overshooting current for zero field variation rates at the end of the current ramping.

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