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

  1. [해외논문]   Bulk and CC-Tape Based Superconducting Shields for Magnetic Cloaks   SCI SCIE

    Solovyov, Mykola , Souc, J. , Gomory, Fedor , Rikel, M. O. , Mikulasova, Edita , Usakova, Marianna , Usak, Elemir
    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

    Two-shell scheme consisting of an outer ferromagnetic tube and an inner superconducting cylinder was experimentally verified as a promising design concept for making magnetic cloaks of centimeter size. Because some applications may require bigger sizes of the shielded volume, scalability of dimensions is an important parameter in the assessment of various options for cloak design. It is easy to prepare uniform ferromagnetic tubes with diameters exceeding several centimeters. On the other hand, producing a superconducting shield with comparable dimensions is not trivial. In the present work, we examined two types of superconducting inserts. The first type is the hollow cylinder made from the bulk superconducting material-BSCCO-2212. In the second type, there are 12 mm wide coated conductor tapes helically wound on the fiberglass former forming the shielding layers. Both superconducting cylinders with identical inner diameter 43 mm and length 145 mm were tested in low frequency ac magnetic field. We compare the shielding properties and the complex magnetic susceptibility of these inserts.

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  2. [해외논문]   Improved Critical Current Densities of Bulk MgB2 Using Carbon-Coated Amorphous Boron   SCI SCIE

    Muralidhar, Miryala , Higuchi, Masaki , Jirsa, Milos , Diko, Pavel , Kokal, Ilkin , Murakami, Masato
    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, we report on a further improvement of the critical current density of the sintered bulk MgB 2 material utilizing the optimized sintering temperature combined with a varying content of carbon in carbon-encapsulated boron. The MgB 2 bulk was prepared from high-purity commercial powder of Mg metal and a carbon-encapsulated boron with 0 wt.%, 2.8 wt.%, 4.5 wt.%, and 7.3 wt.% of carbon, using a single-step solid-state reaction at 805°C for 3 h in pure argon atmosphere. The magnetization measurements confirmed a sharp superconducting transition with onset T c at around 38.5 K, decreasing with increasing carbon content. For 7.3 wt.% of carbon, the bulk MgB 2 reached the superconducting transition at around 33 K. Scanning electron microscopy of the fractured bulk MgB 2 cross section showed a dispersion of 100-200 nm large grains. Due to the carbon doping and optimized processing, the critical current density (J c ) in bulk MgB 2 samples with the carbon-coated boron was improved both in low and high magnetic fields. The highest J c values at 20 K, of 375 and 220 kA/cm 2 , in the self-field and 1 T, respectively, were achieved in the MgB 2 sample with 2.8 wt.% of carbon in the carbon-encapsulated boron. The present results clearly demonstrate that the optimized sintering temperature combined with the appropriate amount of carbon in carbon-coated boron is able to improve the entire J c performance of the bulk MgB 2 material.

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  3. [해외논문]   Trapped Flux Behavior in Melt-Growth GdBCO Bulk Superconductor Under Off-Axis Field Cooled Magnetization   SCI SCIE

    Zhi Li , Ida, Tetsuya , Miki, Motohiro , Izumi, Mitsuru
    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

    The effective pinning of magnetic flux in high-temperature superconductor bulk plays a basic role in a variety of engineering applications as superior magnetic field sources. We have studied the trapped magnetic flux behavior of large single-grain GdBa 2 Cu 3 O 7-δ (GdBCO) bulk cryomagnet. Here, an off-axis field cooled magnetization is proposed, in which magnetic field was applied with an angle θ with respect to the crystallographic c-axis of the bulk, i.e., off-axis geometry. To verify the trapped flux performance, the flux density parallel to the c-axis was scanned with Hall sensor on the surface of the bulk after off-axis field cooled magnetization. It was found that the trapped flux component along the c-axis still remains strong with up to θ = 30°, and the total flux over the bulk surface reaches over 97% compared with that when θ = 0°. These results demonstrate GdBCO bulk can nearly maintain their full trapped flux potential along the c-axis under off-axis field cooled magnetization with finite inclination angle. Thus, the present off-axis magnetization can provide an alternative choice for the magnetization geometry design in HTS applications using bulks, when the magnetizing field cannot be applied perfectly aligned with the crystallographic c-axis of the bulk.

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  4. [해외논문]   Study on the E-t Characteristics of GFRP for a High-Voltage Superconducting Apparatus   SCI SCIE

    Hongseok Lee (Dept. of Electr. Eng., Korea Nat. Univ. of Transp., Cungju, South Korea ) , Onyou Lee (Dept. of Electr. Eng., Korea Nat. Univ. of Transp., Cungju, South Korea ) , Junil Kim (Dept. of Electr. Eng., Korea Nat. Univ. of Transp., Cungju, South Korea) , Hyoungku Kang
    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

    Power consumption has been increasing in industrial society [1]. The application of a superconducting apparatus is considered one of the most promising countermeasures against the increased power consumption. Additionally, the rated voltage of the superconducting apparatus has been being uprated to minimize the power loss. In order to ensure the electrical safety of a high-voltage superconducting apparatus, the dielectric design of solid insulation materials used in the high-voltage superconducting apparatus should be performed considering the aging characteristics. In this study, we examine the E-t characteristics of glass fiber reinforced plastic (GFRP), known to be one of the best solid insulation materials for cryogenic conditions [2]. Specifically, the E-t characteristics of GFRP according to its electric field uniformity are tested and analyzed to ensure the reliability of long-term operation. All the experiments are conducted in liquid nitrogen (LN2) to suppress the occurrence of creepage discharge and to promote the occurrence of electrical breakdown [3]. The experiments on the E-t characteristics of GFRP are performed with four kinds of sphere-plane electrode systems manufactured using stainless steel. The electric field uniformity and its relationship with electrical breakdown are analyzed using a finite element method, and the experimental results are analyzed using the Weibull distribution.

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  5. [해외논문]   Screening Current-Induced Magnetic Field in a Noninsulated GdBCO HTS Coil for a 24 T All-Superconducting Magnet   SCI SCIE

    Lei Wang , Qiuliang Wang , Jianhua Liu , Hui Wang , Xinning Hu , Peng Chen
    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

    A 24 T all-superconducting magnet, consisting of a 9 T GdBCO high-temperature superconducting (HTS) insert and 15 T low-temperature superconducting (LTS) outer coils, has been manufactured and tested at the Institute of Electrical Engineering, Chinese Academy of Sciences. A central magnetic field reduction and drift in the superconducting magnet system were caused by the screening current induced in the GdBCO HTS coil. Therefore, it is crucial to estimate the screening current-induced magnetic field in the HTS coil. In this paper, the magnetic field generated by the screening current was numerically calculated based on magnetization analysis. Three related experiments were performed at 4.2 K to verify the simulations: First, charging the HTS coil at different ramping rates; second, charging the LTS coils with central field of 10.82 T first and the HTS coil subsequently; and third, charging the LTS coils with central field of 15 T first and the HTS coil subsequently. The calculation results show a good agreement with the measured data.

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  6. [해외논문]   Dynamic Level-Detecting Characteristics of External-Heating-Type MgB2 Liquid Hydrogen Level Sensors Under Liquid Level Oscillation and Its Application to Sloshing Measurement   SCI SCIE

    Maekawa, Kazuma , Takeda, Minoru , Hamaura, Takaaki , Suzuki, Kohei , Matsuno, Yu , Fujikawa, Shizuichi , Kumakura, Hiroaki
    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

    To establish the worldwide storage and marine transportation of hydrogen, it is important to develop liquid hydrogen tanks/carriers as well as a long level sensor such as a superconducting magnesium diboride (MgB 2 ) level sensor. An external-heating-type MgB 2 level sensor is expected to be an excellent choice for liquid hydrogen because of its high linearity, resolution, and reproducibility. The dynamic level-detecting characteristics of three 500-mm-long MgB 2 level sensors have been evaluated under conditions of oscillating liquid level using an optical cryostat and a high-speed microscope. The response time to variations of the liquid hydrogen level is about 0.1 s, and the difference between the level read optically and that detected by the MgB 2 level sensors is about 5 mm under these conditions. Thus, the MgB2 level sensors have superior response performance for the sloshing measurement of liquid hydrogen.

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  7. [해외논문]   High Shear-Strength Electrical Insulations for Plasma Confinement Magnets   SCI SCIE

    Haight, Andrea E. , Haynes, Mark W.
    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

    Nuclear fusion is being developed as a source of abundant, renewable energy. Fusion energy production utilizes large, superconducting magnets to confine and shape burning plasmas, and fusion reactions have been demonstrated and studied at several facilities. While the science is well-understood, several challenges must be overcome to construct reactors for power generation. Most notably, superconducting magnet systems that can operate reliably for long periods of time under ever increasing loads and radiation fluences must be developed. A particular challenge for magnet designers in these applications involves developing electrical insulation that is able to withstand the combined loads of extreme temperatures (both cryogenic and elevated temperatures), large shear stresses, cyclic fatigue, high operating voltages, and high levels of incident irradiation. Composite technology development (CTD) has investigated a series of toughened insulations with the objectives of enhancing fatigue and shear strength, radiation tolerance, and dielectric strength. Significant shear fatigue resistance improvements were achieved for two cases. CTD-425 saw a 250% improvement in cycles to failure, while the improved CTD-101K laminate did not fail under cyclic loading (180 000 cycles) when using treated fibers. Radiation resistance was improved as much as 45% at four times the ITER design fluence.

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