Yagai Tsuyoshi

(谷貝剛)

Profile Information

Affiliation: Professor, Faculty of Science and Technology, Department of Engineering and Applied Sciences, Sophia University

Degree: 学士(東北大学)
修士(東北大学)
博士（工学）(東北大学)

Researcher number: 60361127
J-GLOBAL ID: 201301010164130335
researchmap Member ID: 7000004361

(Subject of research)
Investigation on superconducting magnetic energy storage device made of MgB2 cooled by Liquid hydrogen for stabilizing power generation produced by renewable energy sources

Research Interests

Research Areas

Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Electrical power engineering /

Awards

2025

令和６年度核融合炉工学共同研究優秀賞, 電磁応力下における多重撚り導体の機械的・電磁的現象把握と線材高強度化設計指針の構築, 量子科学研究開発機構

伴野信哉, 谷貝剛, 宇藤裕康
2022

令和４年度学術論文賞, 大型磁石応用への大電流容量MgB2導体開発, 低温工学・超電導学会

谷貝剛, 高橋雅史, 高尾智明, 新冨孝和, 槙田康博, 駒込敏弘, 平野直樹, 濱島高太郎, 菊池章弘, 西島元, 松本明善

Papers

126

Measurement of Strands Location and Inter-Strand Contact Resistance in a CIC Conductor

T. MATSUDA, T. YAGAI, H. KUDO, K. YOSHIDA, T. OBANA, H. MURAKAMI

Plasma Fusion and Research, 10 1-5, 2015 Peer-reviewed
Investigation of Frictional Force Applied to Strands Surrounded by Other Strands and Tribological Analysis of Contact Surface in CIC Conductor

T. Yagai, H. Kudo, K. Hamano, K. Yoshida, S. Hamaguchi, K. Natsume, T. Obana

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 24(3), Jun, 2014 Peer-reviewed
Study on Resistance Distribution Between Superconducting Strand and a Copper Sleeve in a CICC Joint Considering Three-Dimensional Strand Path

Toshiya Morimura, Daisuke Miyagi, Makoto Tsuda, Takataro Hamajima, Tsuyoshi Yagai, Yoshihiko Nunoya, Norikiyo Koizumi, Kazuya Takahata, Tetsuhiro Obana

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 24(3), Jun, 2014 Peer-reviewed
Thermal Stability of Butt Joint for CS Conductor in JT-60SA

T. Takao, Y. Kawahara, K. Nakamura, Y. Yamamoto, T. Yagai, H. Murakami, K. Yoshida, K. Natsume, S. Hamaguchi, T. Obana, K. Takahata, S. Imagawa, T. Mito

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 24(3), Jun, 2014 Peer-reviewed
大型ＣＩＣ導体における素線の座屈現象の理論的・実験的解析

谷貝剛, 吉田一貴, 工藤秀俊, 松田貴徳, 濱口真司, 尾花哲浩, 夏目恭平

ASC-14-016, 2014
Theoretical and experimental analysis of Nb3Sn strand buckling in large scale CIC conductor

Hidetoshi Kudoh, Tsuyoshi Yagai, Kei Hamano, Kazuki Yoshida, Shinji Hamaguchi, Kyohei Natsume, Tetsuhiro Obana

Plasma and Fusion Research, 9(2), 2014 Peer-reviewed
Buckling Analysis of Nb3Sn Strand for Large-Scale Cable-In-Conduit Conductor

T. Yagai, K. Yoshida, K. Hamano

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 23(3), Jun, 2013 Peer-reviewed
AC Loss of Nb3Sn Butt Joint for JT-60SA Central Solenoid

Kazuya Nakamura, Yuzuru Kawahara, Tomoaki Takao, Tsuyoshi Yagai, Haruyuki Murakami, Kiyoshi Yoshida, Tetsuhiro Obana, Kazuya Takahata

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 23(3), Jun, 2013 Peer-reviewed
CIC導体の撚りピッチがジョイント部の超電導素線-銅スリーブ間接触状況に及ぼす影響

森村俊也, 渡部一晃, 宮城大輔, 津田理, 濱島高太郎, 谷貝剛, 高畑一也, 尾花哲浩

電気関係学会東北支部連合大会講演論文集, 2013 251-251, 2013
Comparison of analytical estimation and 3-d measurement of all strands location in cic conductor

Daisuke Miyagi, Shinobu Nakazawa, Daichi Arai, Toshiya Morimura, Makoto Tsuda, Takataro Hamajima, Tsuyoshi Yagai, Norikiyo Koizumi, Yoshihiko Nunoya, Kazuya Takahata, Tetsuhiro Obana

IEEE Transactions on Applied Superconductivity, 23(3), 2013 Peer-reviewed
Curvature Analysis of Nb3Sn Strands in React and Wind CIC Conductor for Fusion Magnets

YAGAI TSUYOSHI, Nakazawa, S, Tsuda, M, Hamajima, T

IEEE Transaction on Applied Superconductivity, 22(3) 4802304, Jun, 2012
Curvature Analysis of Nb3Sn Strands in React and Wind CIC Conductor for Fusion Magnets

T. Yagai, S. Nakazawa, M. Tsuda, T. Hamajima

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 22(3), Jun, 2012 Peer-reviewed
Optimal Pitch Analysis Governing Contact Strand Number and Lengths With Cu Sleeves at CIC Joints

S. Nakazawa, S. Teshima, D. Arai, D. Miyagi, M. Tsuda, T. Hamajima, T. Yagai, Y. Nunoya, N. Koizumi, K. Takahata, T. Obana

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 22(3), Jun, 2012 Peer-reviewed
Analysis of 3-D Locations of All Strands in CIC Conductor

D. Miyagi, S. Teshima, S. Nakazawa, D. Arai, M. Tsuda, T. Hamajima, T. Yagai, N. Koizumi, Y. Nunoya, K. Takahata, T. Obana

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 22(3), Jun, 2012 Peer-reviewed
Ic analysis of NB3Sn strand cable-in-conduit conductor under the electromagnetic force by the structural mechanics

Tsuyoshi Yagai, Takataro Hamajima

Plasma and Fusion Research, 7(1), 2012 Peer-reviewed
Analysis of contact lengths of strands with Cu sleeves in CICC joints

Shinobu Nakazawa, Daichi Arai, Toshiya Morimura, Daisuke Miyagi, Makoto Tsuda, Takataro Hamajima, Tsuyoshi Yagai, Yoshihiko Nunoya, Norikiyo Koizumi, Kazuya Takahata, Tetsuhiro Obana

Plasma and Fusion Research, 7(1), 2012 Peer-reviewed
Analysis of strand positions in CIC conductor

S. Teshima, S. Nakazawa, M. Tsuda, T. Hamajima, T. Yagai, Y. Nunoya, K. Okuno, K. Takahata

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 471(21-22) 1550-1553, Nov, 2011 Peer-reviewed
Analysis of Current Distribution in Multi-Laminated HTS Tape Conductor for Double Pancake Coil of SMES

Takataro Hamajima, Naoki Atomura, Yuta Chiba, Tsuyoshi Yagai, Makoto Tsuda, Koji Shikimachi, Naoki Hirano, Shigeo Nagaya

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 21(3) 1371-1374, Jun, 2011 Peer-reviewed
Balanced Three-Phase Distribution Experiment of a Triaxial HTS Cable

Takataro Hamajima, A. Nuri Ozcivan, Kazuki Shimoyama, Seiji Soeda, Nannan Hu, Tsuyoshi Yagai, Makoto Tsuda

ELECTRONICS AND COMMUNICATIONS IN JAPAN, 94(2) 51-58, Feb, 2011 Peer-reviewed
AC loss of a multi-layer per phase tri-axial HTS cable with balanced current distribution

Ozcivan, A.N., Toda, M., Hu, N., Hoshino, K., Yagai, T., Tsuda, M., Hamajima, T.

Journal of Superconductivity and Novel Magnetism, 24(1-2) 975-980, 2011 Peer-reviewed
ケーブル・イン・コンジット導体ジョイントにおける超電導素線と銅スリーブ間の接触素線数と接触長分布に関する解析

NAKAZAWA Shinobu, TESHIMA Shotaro, ARAI Daichi, TSUDA Makoto, TSUDA Makoto, HAMAJIMA Takataro, YAGAI Tsuyoshi, NUNOYA Yoshihiko, KOIZUMI Norikiyo, TAKAHATA Kazuya, OBANA Tetsuhiro

低温工学学会誌, 46(8) 474-480, 2011 Peer-reviewed
Curvature Analysis of Nb3Sn Strands in React and Wind CIC Conductor for Fusion Magnets

T. Yagai, S. Nakazawa, M. Tsuda, T. Hamajima

IEEE Transaction on Applied Superconductivit, 22, 2011 Peer-reviewed
Design of HTS tri-axial cable in steady-state operation

N. Hu, M. Toda, A. N. Ozcivan, T. Yagai, M. Tsuda, T. Hamajima

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 470(20) 1584-1587, Nov, 2010
Stationary levitation and vibration transmission characteristic in a superconducting seismic isolation device with a permanent magnet system and a copper plate

S. Sasaki, K. Shimada, T. Yagai, M. Tsuda, T. Hamajima, N. Kawai, K. Yasui

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 470(20) 1791-1794, Nov, 2010 Peer-reviewed
Study on Three-Phase Superconducting Fault Current Limiter

Y. Cai, S. Okuda, T. Odake, T. Yagai, M. Tsuda, T. Hamajima

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 20(3) 1127-1130, Jun, 2010 Peer-reviewed
Conceptual Design of Coaxial Multi-Layer Type CIC for SC Magnet of FFHR

T. Hamajima, S. Teshima, Y. Shibata, T. Yagai, M. Tsuda, K. Takahata, S. Imagawa, T. Mito

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 20(3) 560-563, Jun, 2010 Peer-reviewed
超電導CIC導体のジョイント部の素線配置に関する考察

中澤忍, 手島翔太郎, 濱島高太郎, 津田理, 谷貝剛, 高畑一也

電気関係学会東北支部連合大会講演論文集, 2010 310-310, 2010
Suitable method for increasing current carrying capacity of HTS toroidal coils for SMES and DC reactor

Tsuda, M., Yagai, T., Hamajima, T.

IEEE Transactions on Applied Superconductivity, 20(3) 1365-1368, 2010 Peer-reviewed
Investigation on AC loss of a high temperature superconducting tri-axial cable depending on twist pitches

A. N. Ozcivan, S. Soeda, N. Hu, T. Yagai, M. Tsuda, T. Hamajima

CRYOGENICS, 49(12) 714-718, Dec, 2009 Peer-reviewed
Experimental results of tri-axial HTS cable

Kazuki Shimoyama, Nuri Ozcivan, Seiji Soeda, Nannan Hu, Yuichi Onoe, Tsuyoshi Yagai, Makoto Tsuda, Takataro Hamajima

CRYOGENICS, 49(8) 398-401, Aug, 2009 Peer-reviewed
Irregular Flux Linkage for Coupling Current Loops in Different Type CIC Conductors

Tsuyoshi Yagai, Y. Shibata, J. Ohmura, M. Tsuda, T. Hamajima, Y. Nunoya, K. Okuno, K. Takahata

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 19(3) 2387-2390, Jun, 2009 Peer-reviewed
Spatial and Temporal Variations of a Screening Current Induced Magnetic Field in a Double-Pancake HTS Insert of an LTS/HTS NMR Magnet

Min Cheol Ahn, Tsuyoshi Yagai, Seungyong Hahn, Ryuya Ando, Juan Bascunan, Yukikazu Iwasa

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 19(3) 2269-2272, Jun, 2009 Peer-reviewed
Balanced Three-Phase Distributions of Tri-Axial Cable for Transmission Line

T. Hamajima, N. Hu, N. Ozcivan, S. Soeda, T. Yagai, M. Tsuda

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 19(3) 1748-1751, Jun, 2009 Peer-reviewed
Vibration Transmission Characteristics Against Vertical Vibration in Magnetic Levitation Type HTS Seismic/Vibration Isolation Device

Makoto Tsuda, Keisuke Tamashiro, Shuhei Sasaki, Tsuyoshi Yagai, Takataro Hamajima, Takashi Yamada, Kenji Yasui

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 19(3) 2249-2252, Jun, 2009 Peer-reviewed
Micro Power Grid System With SMES and Superconducting Cable Modules Cooled by Liquid Hydrogen

T. Nakayama, T. Yagai, M. Tsuda, T. Hamajima

IEEE Transaction on Applied Superconductivity, 19(3) 2062-2065, 2009 Peer-reviewed
液体水素－超電導ハイブリッドエネルギー輸送システムの検討

中山知紀, 大友勝志, 谷貝剛, 津田理, 濱島高太郎

低温工学, vol.43(No.10) 417-422, Oct, 2008 Peer-reviewed
AC loss in a tri-axial HTS cable with balanced current distribution

A. N. Ozcivan, K. Shimoyama, S. Soeda, T. Yagai, M. Tsuda, T. Hamajima

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 468(15-20) 2033-2036, Sep, 2008 Peer-reviewed
Vibration isolation characterisitics in magnetic levitation type seismic isolation device composed of HTS bulk permanent magnet

M.Tsuda, K.Tamashiro, T.Yagai, T.Hamajima

Proceedings of International Cryogenic Engineering Conference 22 and International Cryogenic Materials Conference 2008, 895-900, Aug, 2008 Peer-reviewed
Investigation of a mechanism forming irregular loops in large CIC conductor

T. Yagai, Y. Nara, J. Ohmura, M. Tsuda, T. Hamajima, Y. Nunoya, K. Okuno, K. Takahata

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 18(2) 1123-1126, Jun, 2008 Peer-reviewed
Balanced 3-phase distribution experiment of a tri-axial HTS cable

Hamajima, T., Ozcivan, N.A., Shimoyama, K., Soeda, S., Hu, N., Yagai, T., Tsuda, M.

IEEJ Transactions on Power and Energy, 128(10), 2008
Dependence of Horizontal Vibration Characteristics on Load Weight Distribution in Magnetic Levitation Type Seismic Isolation Device

M. Tsuda, T. Kawasaki, T. Yagai, T. Hamajima

IEEE Trans. Appl. Supercond, 18(2) 832-835, 2008 Peer-reviewed
三相同一軸超電導ケーブルの平衡分布特性実験

濱島高太郎, オズジバンヌリ, 下山和貴, 添田誠司, 胡南南, 谷貝剛, 津田理

電気学会論文誌Ｂ電力エネルギー部門誌, IEEEJ. Trans. PE, 128(10) 1278-1284, 2008 Peer-reviewed
三相同一軸高温超電導ケーブルの特性試験

下山和貴, オズジバンヌリ, 添田誠司, 胡南南, 尾上裕一, 谷貝剛, 津田理, 濱島高太郎

低温工学学会誌, 43(1) 23-27, 2008 Peer-reviewed
Optimization of hybrid power system composed of SMES and flywheel MG for large pulsed load

Niiyama, K., Yagai, T., Tsuda, M., Hamajima, T.

Physica C: Superconductivity and its Applications, 468(15-20) 2111-2114, 2008 Peer-reviewed
Investigation of irregular strand positions causing additional AC losses in CIC conductor

T. Yagai, H. Sato, Y. Nara, M. Tsuda, T. Hamajima, Y. Nunoya, K. Okuno, K. Takahata

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 17(2) 2470-2473, Jun, 2007 Peer-reviewed
Analysis of AC losses in a tri-axial superconducting cable

T. Hamajima, M. Tsuda, T. Yagai, S. Monma, H. Satoh, K. Shimoyama

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 17(2) 1692-1695, Jun, 2007 Peer-reviewed
大型CIC導体における長時定数結合電流ループの形成に関する検討

谷貝剛, 奈良雄紀, 佐藤秀成, 津田理, 濱島高太郎, 布谷嘉彦, 奥野清, 高畑一也

ASC-07-26(18) 43-48, 2007
Vibration Characteristics in Magnetic Levitation Type Seismic Isolation Device Composed of Multiple HTS Bulks and Permanent Magnets

M. Tsuda, T. Kojima, T. Yagai, T. Hamajima

IEEE Trans. Appl. Supercond, 17(2) 2059-2062, 2007 Peer-reviewed
Stability analysis of high temperature superconducting coil in liquid hydrogen

T. Nakayama, T. Yagai, M. Tsuda, T. Hamajima

Physica C, 463 1285-1288, 2007 Peer-reviewed
Coupling loss with long time constants due to large displacement of strands in a large CIC conductor

T. Yagai, H. Sato, M. Tsuda, T. Hamajima, Y. Nunoya, Y. Takahashi, K. Okuno

FUSION ENGINEERING AND DESIGN, 81(20-22) 2503-2507, Nov, 2006 Peer-reviewed

Misc.

キンゾク・セラミックス/チョウデンドウキキゴウドウケンキュウカイ・ワカテケンキュウカイ「キンゾク・セラミックスセミナー」

2022(13-28) 71-74, Nov 15, 2022
サーモサイフォン循環液体水素冷却によるSMESモデル装置—SMES Model Device Cooled by Liquid Hydrogen Flow through Thermosiphon Loop—特集超電導応用における循環冷却システム

槇田康博, 新冨孝和, 谷貝剛, 髙橋雅史, 猪俣涼, 駒込敏弘, 平野直樹, 濱島高太郎

低温工学 = Journal of Cryogenics and Superconductivity Society of Japan, 57(4) 241-245, 2022
キンゾク・セラミックス/チョウデンドウキキゴウドウケンキュウカイ・ワカテケンキュウカイ「キンゾク・セラミックスセミナー」

イノマタリョウ, タカハシマサフミ, オンチタイキ, ヤガイツヨシ, シントミタカカズ, マキタヤスヒロ, コマゴメトシヒロ

2021(9-25) 69-72, Dec 7, 2021
Development of a persistent current 400 MHz (9.39T) LTS/Bi2223 NMR-test results of a Bi2223 inner coil at 4 K-

武田泰明, 武田泰明, 末富佑, 末富佑, 中井優亨, 松竹優一, 谷貝剛, PIAO Renzhong, 柳澤吉紀, 元木貴則, 下山淳一, 濱田衞, 斉藤一功

低温工学・超電導学会講演概要集, 101st, 2021
MgB₂大容量導体における素線変形に起因する特性劣化と拡張有限要素解析—Investigation on critical current degradation caused by strand deformation in a MgB₂ large-scale conductor with extended finite element method—金属・セラミックス超電導機器合同研究会・超電導応用および材料関連技術

谷貝剛, 平萌人, 桑原優介, 高尾智明, 槙田康博, 新冨孝和, 駒込敏弘, 塚田謙一, 星野昌幸, 平野直樹, 恩地太紀, 富田優, 宮城大輔, 津田理, 濱島高太郎

電気学会研究会資料. MC / 超電導機器金属・セラミックス合同研究会 [編], 2019(13-19) 9-14, Dec 19, 2019

Presentations

修正スパースタブロー法を用いたHTS積層導体の局所クエンチからの電流再配分

谷貝剛, 槙田康博, 新冨孝和, 平野直樹, 濱島高太郎

2025年度秋季第110回低温工学・超電導学会研究発表会, Dec 9, 2025
EVの急速充電用超電導ＤＣＤＣコンバータの高昇圧比動作特性

谷貝剛, 槙田康博, 新冨孝和, 平野直樹, 濱島高太郎

2025年度秋季第110回低温工学・超電導学会研究発表会, Dec 9, 2025
High-speed numerical calculation of current distribution in a large CIC conductor by newly developed Revised Sparse-Tableau method

May 28, 2025

Attachment
EVの急速充電用超電導DCDCコンバータの高昇圧比・大電流化

谷貝剛, 槙田康博, 新冨孝和, 平野直樹, 濱島高太郎

2025年度春季低温工学・超電導学会, May 28, 2025

Attachment
液体水素冷熱の有効利用と EVの急速充電を実現する超電導DCDCコンバータの開発

谷貝剛, 槙田康博, 新冨孝和, 平野直樹, 濱島高太郎

2024年度春季低温工学・超電導学会, May 25, 2024

Professional Memberships

Research Projects

Ultra fine A15 superconducting wire for high-field accelerator magnets

Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2021 - Mar, 2024
Quench protection of MgB2 thin superconducting solenoid for particle detector

Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2021 - Mar, 2024

MAKIDA Yasuhiro
Development of large-capacity SMES realizing a highly stabilized power conditioning system with low-carbon emission by utilizing liquid hydrogen providing network.

Apr, 2021 - Mar, 2022

T. Yagai
Basic research on evaluation method of mechanical strain effect and coiling technology of high-temperature superconducting wires

Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2016 - Mar, 2020

Nomura Shinichi
Investigation of twist-pitch dependence on AC losses in CIC conductor based on strand location measurement

Apr, 2015 - Mar, 2018

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