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

  1. [해외논문]   Magnetic Shielding Above 1 T at 20 K With Bulk, Large Grain YBCO Tubes Made by Buffer-Aided Top Seeded Melt Growth   SCI SCIE

    Wera, Laurent , Fagnard, Jean-Francois , Namburi, Devendra K. , Yunhua Shi , Vanderheyden, Benoit , Vanderbemden, Philippe
    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

    YBCO tubes of ~10 mm diameter closed at one extremity were engineered by a buffer-aided top seeded melt growth fabrication process. These tubes can act as efficient “dc” magnetic shields and are observed to reduce axial flux densities of 1.5 T by a factor of 100 at 20 K. Such performances are comparable in magnitude to the record threshold inductions reported for bulk MgB2 and Bi-2212 materials at lower temperatures. Magnetic shielding measurements for open and closed tubes at 77 K also show that the presence of the cap improves substantially the shielding performance at the closed extremity since it reduces the penetration through the open end. This fabrication technique is extremely promising for shielding “dc” stray fields generated by high temperature superconductor magnets operated in a temperature range obtained by cryocoolers, liquid hydrogen (20 K), or liquid neon (27 K).

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  2. [해외논문]   Table of Contents   SCI SCIE


    IEEE transactions on applied superconductivity : a publication of the IEEE Superconductivity Committee v.27 no.4 pt.3 ,pp. 1 - 8 , 2017 , 1051-8223 ,

    초록

    Presents the table of contents for this issue of the publication.

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  3. [해외논문]   Trapped Field Enhancement of a Thin, High-Jc MgB2 Bulk Without Flux Jumps Using Pulsed Field Magnetization With a Split-Type Coil With a Soft Iron Yoke   SCI SCIE

    Fujishiro, H. , Takahashi, K. , Ainslie, M. D. , Mochizuki, H. , Naito, T.
    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 investigated the suppression of flux jumps and the enhancement of trapped field on a thin, high-J c MgB 2 bulk (30 mm in diameter and 7 mm in thickness) for the pulsed field magnetization (PFM) using a split-type coil with a soft iron yoke, and compared the results to those magnetized using the split-type coil without a yoke and a solenoid-type coil with a yoke. A maximum-trapped field, B z , of 0.71 T at 14 K was achieved on the bulk surface without flux jumps by using the split coil with yoke. On the other hand, low B z values with flux jumps were observed for the cases using the split-type coil without a soft iron yoke, and the solenoid-type coil with a yoke. These results reproduce previous ones for a thick, high-J c MgB 2 bulk (22 mm in diameter and 15 mm in thickness), for which the trapped field was enhanced to a record high value of B z = 1.10 T at 13 K by PFM using the split-type coil with a yoke.

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  4. [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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  5. [해외논문]   Boltzmann Analysis of Cryogenic $\text{He}$ $\text{H}_{\text{2}}$ Gas Mixtures as Dielectric Media for High-Temperature Superconducting Power Devices   SCI SCIE

    Chanyeop Park , Pamidi, Sastry , Graber, Lukas
    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

    Analysis of the dielectric properties of gas mixtures in the context of their application as cryogens for high-temperature superconducting power applications is presented. Boltzmann analysis was conducted for pure gaseous helium (He) and its mixtures consisting of small mole fractions of gaseous hydrogen (H 2 ) to establish a theoretical foundation for the observed enhancement in dielectric strength at cryogenic temperatures. Boltzmann analysis showed that the electron energy distribution function shifts to the lower energy region, the reduced ionization coefficient (α/N), and the reduced effective ionization coefficient ((α - η)/N) decreases, whereas the reduced attachment coefficient (η/N) and the reduced critical electric field ((E/N)cr) increases as the mole fractions of H 2 increase in the He-H 2 mixture. The results of the analysis predict a persisting enhancement of dielectric strength by adding larger amounts of H 2 beyond the reported 4 mol% in the He-H 2 mixtures. The analysis also provides a basis for identifying a suitable gas mixture for gaseous cryogen cooled superconducting device with a required power rating.

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  6. [해외논문]   Structure and Properties of MgB2 Bulks, Thin Films, and Wires   SCI SCIE

    Prikhna, Tatiana A. , Romaka, Vitaliy V. , Shapovalov, Andrii P. , Eisterer, Michael , Sokolovsky, Vladimir , Weber, Harald W. , Grechnev, Gennadiy E. , Boutko, Viktor G. , Gusev, Alexander A. , Kozyrev, Artem V. , Goldacker, Wilfried , Moshchil, Viktor E. , Sverdun, Vladimir B. , Habisreuther, Tobias , Schmidt, Christa , Kovylaev, Valeriy V. , Shaternik, Volodymyr E. , Karpets, Myroslav V. , Shaternik, Anton 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

    This paper describes the established correlations between the characteristics of MgB 2 -based superconducting materials and their structural features, in particular the oxygen distribution and content. As indicated by SEM and Auger analysis, a sizeable amount of oxygen is usually present in superconducting MgB 2 -based materials (bulks, thin films, and wires). The matrix phase of bulk MgB 2 contains rather small amounts of oxygen, but contains a high amount of dispersed inclusions or areas with compositions close to MgBO. X-ray phase analysis with Rietveld refinement (using the FullProf Suite program package) of several highly dense MgB 2 -based bulk samples (with high critical current densities) showed that the superconducting phase had a composition within the range MgB 1.68 O 0.26 and MgB 1.74 O 0.32 instead of pure MgB 2 . Besides, a small amount of a phase with MgO structure was observed in the materials by X-rays as well. The calculation of the enthalpy of formation confirms the possibility of oxygen solubility in MgB 2 and shows that the formation of MgB 1.75 B 0.25 is most favorable. The results of ab initio calculations of the electronic structure and stability of the MgB 2 compounds with partial oxygen substitution for boron show that it is energetically preferable for oxygen atoms to replace boron pairwise.

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  7. [해외논문]   Monitoring Electrical and Thermal Characteristics of HTS Cable Systems via Time–Frequency Domain Reflectometry   SCI SCIE

    GeonSeok Lee (Sch. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea ) , Gu-Young Kwon (Sch. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea ) , Su Sik Bang (Sch. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea ) , Yeong Ho Lee (Korea Electr. Power Corp. Res. Inst., Daejeon, South Korea ) , Song-Ho Sohn (Korea Electr. Power Corp. Res. Inst., Daejeon, South Korea ) , Kijun Park (Sch. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea) , Yong-June Shin
    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 high-temperature superconducting (HTS) cable system with the 22.9 kV, 50 MVA, and 410 m length is installed and operated at 154 kV Icheon substation of Korea Electric Power Corporation (KEPCO). Unfortunately, it is a difficult task to diagnose and monitor electrical and thermal characteristics of the HTS cable system in a real-time manner. In order to protect operational failures of grid-connected HTS cable systems, this paper proposes time-frequency domain reflectometry (TFDR) and analysis techniques, i.e., time-frequency cross correlation and instantaneous frequency estimation. To verify the performance of the proposed method, the temperature is changed via the cryogenic refrigeration system and the status of the grid-connected HTS cable is monitored via TFDR in a real-time manner.

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  8. [해외논문]   The Mechanism of Buckling in the High-Strength Bi-2223 Conductor Due to Release of Bending Strain   SCI SCIE

    Nawa, Masato , Kajita, Kentaro , Renzhong Piao , Nakagome, Hideki , Takao, Tomoaki , Maeda, Hideaki , Yanagisawa, Yoshinori
    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 tensile stress tolerance of a Bi-2223 conductor has been doubled by the use of a mechanically strong Ni-alloy reinforcement material and a pretension technique. It is possible that, however, in the case of overheating due to a thermal runaway in a coil, release of bending strain in the mechanically strong reinforcement tape buckles the conductor itself. The present paper experimentally investigates the basic mechanism of such a buckling phenomenon. If the bending diameter of the coil is small, typically ≤50 mm, the release of the bending strain of the reinforcements instantaneously buckles the conductor itself when the solder between the reinforcements and the Bi-2223/Ag composite is melted. This causes fractures of the Bi-2223 filaments and a permanent degradation of the coil performance. The buckling is prevented by applying a radial compressive stress to the conductor; a smaller diameter coil winding requires a higher amount of compressive stress.

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  9. [해외논문]   Optimization of Infiltration and Reaction Process for the Production of Strong MgB $_{2}$ Bulk Magnets   SCI SCIE

    Ogino, Arata , Naito, Tomoyuki , Fujishiro, Hiroyuki
    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

    An infiltration and reaction (IR) process can realize a dense MgB 2 bulk under an ambient pressure, which is preferable for the industrial mass production in cost. However, the trapped field of the IR-processed bulk is commonly rather smaller than that of the high-pressure synthesized bulk, which is caused by the cracks and the thread-like channels of residual Mg preventing the circular supercurrent flow. To obtain the high-quality IR-processed MgB 2 bulk, we investigated the optimization of heat-treatment condition for the IR-process (sintering temperature, T ht = 700-900 °C and holding time, t h = 1-9 h). A volume fraction of the MgB 2 phase increased monotonically with increasing Tht and/or th, and the grain-size increased with increasing T ht . As a result, the highest critical current density J c and irreversibility field μ 0 H irr were achieved for the sample sintered at 700 °C for 9 h. The relation between the superconducting properties and the microscopic structure was also discussed.

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  10. [해외논문]   A Structural Optimization of Ferrite/YBCO Bilayers   SCI SCIE

    Malmivirta, Mika , Jyrinki, Jaakko , Huhtinen, Hannu , Pan, Alexey V. , Rubanov, Sergey , Jha, R. , Awana, V. P. S. , Paturi, Petriina
    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

    Magnetic particles can be used to take advantage of both defect and magnetic pinning in high-temperature superconductors. We combined layers of ferrite+cerium oxide with YBCO to see their effect both on the structure of the YBCO and on flux pinning. The deposition temperature of the ferrite greatly affects its structure and also the saturation magnetization. Combined with YBCO, the magnetic layer distorts the structure of YBCO, although, for example, the critical temperature remains rather unchanged. According to the structural results achieved here, the magnetic pinning layer is best positioned on the top of YBCO. This way, an improvement in J c (B) is seen in all the field range, and also, a clear improvement of the accommodation field was measured. However, it does not play a huge role whether the ferrite is CoFe 2 O 4 , NiFe 2 O 4 , or ZnFe 2 O 4 , all mixed with CeO 2 .

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