研究者詳細 - 小田部　エドモンド荘司

論文 - 小田部　エドモンド荘司

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Evaluation of Layer Thickness Dependence of Critical Current Density using Longitudinal Magnetic Field Effect in Superconducting Coated Conductors 査読有り国際誌

T. Yonenaka, E. S. Otabe, V. Vyatkin, S. Lee, T. Akune, T. Nishizaki

Journal of Physics: Conference Serie 1293 012017 2019年11月

TDGL Simulation on Angular Dependence of Critical Current Density in Superconductors with Columnar Defects 査読有り国際誌

Rina Yonezuka, Yusei Hamada, Kazunori Kamiji, Kenta Tanimura, Takaki Yoshihara, Edmund Soji Otabe, Yasunori Mawatari, Tetsuya Matsuno

Journal of Physics: Conference Serie 1293 012018 2019年11月

Study on polishing method using magnetic levitation tool by superconductin 査読有り

Yuki Tanaka, Hidetaka Nakashima, Yuta Hiramatsu, Panart Khajornrungruang, Edmund Soji Otabe, Keisuke Suzuki

Journal of the Japan Society for Abrasive Technology 62 219 - 220 2018年04月

Round Robin Test of Residual Resistance Ratio of Nb3Sn Composite Superconductors 査読有り

Matsushita T., Otabe E., Kim D., Hwang T., Gao H., Liu F., Liu H., Cooley L., Turrioni D., Raine M., Hampshire D.

IEEE Transactions on Applied Superconductivity 28 ( 2 ) 2018年03月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 IEEE. In this paper, a round robin test of residual resistance ratio (RRR) is performed for Nb 3 Sn composite superconductors prepared by an internal tin method by six institutes with the international standard test method described in IEC 61788-4. It was found that uncertainty mainly resulted from determination of the cryogenic resistance from the intersection of two straight lines drawn to fit the voltage versus temperature curve around the resistive transition. The measurement clarified that RRR can be measured with expanded uncertainty not larger than 5% with the coverage factor 2 by using this test method.

DOI： 10.1109/TASC.2017.2781182

Kyutacar

Scopus

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The influence of winding direction of two-layer HTS DC cable on the critical current 査読有り

Vyatkin V., Kashiwagi K., Ivanov Y., Otabe E., Yamaguchi S.

Journal of Physics: Conference Series 897 ( 1 ) 2017年09月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© Published under licence by IOP Publishing Ltd. The design of twist pitch and direction of winding in multilayer HTS coaxial cable is important. For HTS AC transmitting cables, the main condition of twist pitch is the balance of inductances of each layer for providing the current balance between layers. In this work, the finite element method analysis for the coaxial cables with both same and opposite directions winding is used to calculate magnetic field distribution, and critical current of the cable is estimated. It was found that the critical current of the cable with same direction winding is about 10 percent higher than that in the case of the cable with the opposite direction winding.

DOI： 10.1088/1742-6596/897/1/012017

Scopus

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Evaluation of Magnetic Cutting and Polishing with Superconducting Bulks 査読有り

Hiramatsu Y., Takahashi Y., Otabe E., Suzuki K., Tanaka Y., Kiuchi M.

Journal of Physics: Conference Series 871 ( 1 ) 2017年07月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© Published under licence by IOP Publishing Ltd. In this paper, magnetic levitation tool with superconducting bulks is introduced as a new hollow machining technology. Magnetic levitation tool is the machine that magnet levitates above superconducting bulks and driving force of rotating magnet shaves the object. This tool is expected to use for a grinding machine and machining device because of hollow machining and micromachining by strong fixing. For using magnetic levitation tool, the attractive force, the repulsive force and rotating torque are important for grinding machine, machining outer surface and both, respectively. These forces are calculated by FEM, and compared with experimental results. The experimental results are agreed well with calculated results. However, the attractive force is one order smaller than that required in chemical mechanical polishing.

DOI： 10.1088/1742-6596/871/1/012048

Kyutacar

Scopus

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Determination of Pinning Parameters in Flux Creep-Flow Model for E-J characteristics of High Temperature Superconductors by using Differential Evolution 査読有り

Otabe E., Taguchi T., Tsuruda Y., Funaki R.

Journal of Physics: Conference Series 871 ( 1 ) 2017年07月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© Published under licence by IOP Publishing Ltd. The pinning parameters such as strength of pinning force, temperature dependence of pinning force and so on using in flux creep-flow model to explain electric field vs current density (E-J) characteristics were determined by Differential Evolution (DE). DE is one of the methods in Evolutionary Computation (EC) to find an optimization of a problem. First, a model data of E-J characteristics in which the pinning parameters were given was prepared, and it was confirmed that DE can find the given pinning parameters from the model data. Then, DE and mesh method were used to determine the pinning parameters in experimental E-J characteristics of GdBa 2 CuO 7-δ high temperature superconductor. In mesh method, the all combinations of pinning parameters with constant interval for each parameter are calculated, and best set of pinning parameters is selected. It was found that DE shows better performance than mesh method in terms of calculation time and accuracy for determining pinning parameters.

DOI： 10.1088/1742-6596/871/1/012046

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85028010511&origin=inward

Ferromagnetic Coating for Decreasingof Self-Magnetic Field Acting on HTS Tapes 査読有り

Vyatkin V., Kashiwagi K., Sun J., Ivanov Y., Otabe E., Yamaguchi S.

IEEE Transactions on Applied Superconductivity 27 ( 4 ) 2017年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2002-2011 IEEE. The decreasing of critical current in the high-temperature tape superconductor (HTS) can be prevented by decreasing of the perpendicular component of self-magnetic field. The coating of this tape by the ferromagnetic material can deform the magnetic field around the HTS tape with flowing transport current. The present report contains the finite-element analysis of the effect of ferromagnetic coating near the HTS tape. The optimal configuration of the ferromagnetic coating for minimizing the perpendicular component of magnetic field was found. In present case, it reduces from 0.04 T to less than 0.01 T. The optimal shape of the coating contains the gap along the lateral side of the HTS tape. The influence of the twisting of the tape coated by ferromagnetic was also investigated. It was found that the difference between twisted and nontwisted cables was not large. The study was also performed for the stack of HTS tapes where neighbor tapes have the opposite direction of the transport current. It was found that the ferromagnetic coating and ribs make the magnetic field near edges smooth.

DOI： 10.1109/TASC.2017.2669586

Scopus

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Evaluation of Trapped Magnetic Field Properties in Superconducting MgB2 Bulk Magnets of Various Shapes by Finite Element Method 査読有り

Y. Hiramatsu, E.S. Otabe, M. Kiuchi

Physics Procedia 81 69 - 72 2016年07月

Critical Current Properties in Longitudinal Magnetic Field of YBCO Superconductor with APC 査読有り

R. Kido, M. Kiuchi, E.S. Otabe, T. Matsushita, A.K. Jha, K. Matsumoto

Physics Procedia 81 117 - 120 2016年07月

Observation of self-magnetic field relaxations in Bi2223 and Y123 HTS tapes after over-current pulse and DC current operation 査読有り

M. Tallouli, J. Sun, N. Chikumoto, E.S. Otabe, O. Shyshkin, S. Charfi-Kaddour, S. Yamaguchi

Cryogenics 77 53 - 58 2016年07月

Current Imbalance and AC Losses of Long-Distance DC HTS Cable 査読有り

Yury Ivanov, Vladimir Vyatkin, Hirofumi Watanabe, Noriko Chikumoto, Makoto Hamabe, Jian Sun, Hirohisa Takano, Satarou Yamaguchi, Edmund Otabe

IEEE Transactions on Applied Superconductivity 26 5900404 4pages 2016年07月

Evaluation of trapped magnetic field properties in superconducting MgB$_2$ bulk magnets by finite element method 査読有り

S. Mizukami, E. S. Otabe, K. Yoshitomi , Vladimir S. Vyatkin, M. Kiuchi, T. Matsushita

Physics Procedia 65 241 - 244 2015年07月

Design of Practical Superconducting DC Power Cable With REBCO Coated Conductors 査読有り

Vladimir S. Vyatkin, Masaru Kiuchi, Edmund S. Otabe, Teruo Matsushita

IEEE Trans. Appl. Supercond. 25 6606207 6606207(7pp) 2015年05月

Fault-Current Limiting Properties in Innovative Force-Free Superconducting DC Cable 査読有り

T. Matsushita, M. Kiuchi, E. S. Otabe, V. S. Vyatkin

IEEE Trans. Appl. Supercond. 25 5401704 5401704(4pp) 2015年05月

Current-carrying capacity of single layer cable using superconducting Bi-2223 tapes in a parallel magnetic field 査読有り

V. S. Vyatkin, M. Kiuchi, E. S. Otabe, M. Ohya, T. Matsushita

Supercond. Sci. Technol. 28 015011 015011 (3pp) 2015年04月

824 超伝導体を用いた磁気援用加工技術に関する研究査読有り

日高裕, 鈴木恵友, 副島一紀, カチョーンルンルアンパナート, 松田将和, 小田部荘司

日本機械学会九州支部講演論文集 2015 ( 0 ) 347 - 348 2015年01月

AC loss of ripple current in superconducting DC power transmission cable 査読有り

K. Yoshitomi, E.S. Otabe, V.S. Vyatkin, M. Kiuchi, T. Matsushita, M. Hamada, S. Yamaguchi, R. Inada

Physics Procedia 58 326 - 329 2014年06月

Design of high current superconducting DC power cable using the longitudinal magnetic field configuration 査読有り

T. Matsushita, V. S. Vyatkin, M. Kiuchi, E. S. Otabe

Advances in Cryogenic Engineering 1574 225 - 231 2014年04月

Fabrication of 1 T Bi-2223 Superconducting Magnet with 92 mm Bore Diameter at 77 K 査読有り

Edmund S. Otabe, Vladimir S. Vyatkin, Masaru Kiuchi, Teruo Matsushita, Baorong Ni, Takeshi Kato, Takashi Nishimura, Ryota Uetsuki

Advances in Cryogenic Engineering 1573 754 - 759 2014年04月

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