Updated on 2025/02/28

 
OKADA Tatsunori
 
Scopus Paper Info  
Total Paper Count: 0  Total Citation Count: 0  h-index: 12

Citation count denotes the number of citations in papers published for a particular year.

Affiliation
Faculty of Engineering Department of Materials Science
Job
Associate Professor
External link

Undergraduate Education

  • 2011.03   The University of Tokyo   Faculty of Liberal Arts   Graduated   Japan

  • 2009.03   The University of Tokyo   Faculty of Liberal Arts   Japan

Post Graduate Education

  • 2016.03   The University of Tokyo   Graduate School, Division of General Culture   Doctoral Program   Completed   Japan

  • 2013.03   The University of Tokyo   Graduate School, Division of General Culture   Master's Course   Completed   Japan

Degree

  • The University of Tokyo  -  Ph.D.   2016.03

Biography in Kyutech

  • 2024.09
     

    Kyushu Institute of Technology   Faculty of Engineering   Department of Materials Science   Associate Professor  

Biography before Kyutech

  • 2016.10 - 2024.08   Tohoku University   Assistant Professor   Japan

  • 2016.04 - 2016.09   The University of Tokyo   Special researcher of the Japan Society for the Promotion of Science   Japan

Academic Society Memberships

Papers

  • Superconducting Properties of GdBCO Coated Conductors With Domain Control by Bending Strain Reviewed International journal

    Okada T., Shimamura Y., Awaji S.

    IEEE Transactions on Applied Superconductivity   /1 - /9   2024.11

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1109/TASC.2024.3491220

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  • Flux Pinning Properties of 7-Filament Cu/Ag-Sheathed Ba<inf>1-x</inf>K<inf>x</inf>Fe<inf>2</inf>As<inf>2</inf>Tapes at 4.2 K Reviewed International journal

    Luo J., Okada T., Awaji S., Liu C., Ma Y.

    IEEE Transactions on Applied Superconductivity   33 ( 5 )   1 - 5   2023.08

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1109/TASC.2023.3263331

    Scopus

    CiNii Research

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  • Performance Test of 20-Stacked Two-Tapes-Bundled REBCO Pancake Coils for Upgrading of 25-T Cryogen-Free Superconducting Magnet to 30 T Reviewed International journal

    Takahashi K., Badel A., Zampa A., Okada T., Awaji S., Nishijima G., Uto T., Takewa H., Hanai S., Ioka S., Inagaki J.

    IEEE Transactions on Applied Superconductivity   33 ( 5 )   2023.08

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1109/TASC.2023.3252496

    Kyutacar

    Scopus

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  • Mechanical and critical current characteristics of high-strength Bi 2 Sr 2 Ca 2 Cu 3 O 10 + δ multi-filamentary tapes reinforced with thicker Ni-alloy laminations with various pre-tensions Reviewed International journal

    Okada T., Kobayashi D., Sakai K., Awaji S., Kikuchi M., Kato T.

    Superconductor Science and Technology   36 ( 1 )   014002   2023.01

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    We investigated the stress–strain relation and the applied strain dependence of the critical current Ic(εapp) of high-strength Bi2Sr2Ca2Cu3O10+δ (Bi2223) R&D tapes reinforced by ～100 μm thick Ni-based alloy sheets with various pre-tensions Fpre applied during the lamination process. We confirmed that the thickening of Ni-alloy laminations is useful for enhancing Young's modulus compared with commercial tapes (≃30μm thick laminations). Ic(εapp) decreases gradually and reversibly with applied strains εapp and then degrades irreversibly with larger tensile and compressive strains. The reversible strain regime tends to shift toward the tensile side with larger Fpre, indicating that application of large Fpre is effective in improving the reversible tensile strain limit. The observed Ic(εapp) can be reproduced well by model considering εapp-linear critical current density, cross-sectional strain distribution, and Weibull-type distribution of filament damage. We clarified that different irreversible Ic(εapp) degradations with large tensile and compressive strains can be understood by differences in the dimensions and number of cracks and ruptures (tensile strains) and bucklings (compressive strains).

    DOI： 10.1088/1361-6668/aca435

    Kyutacar

    Scopus

    CiNii Research

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  • Thermodynamic approach for enhancing superconducting critical current performance Reviewed International journal

    Miura M., Tsuchiya G., Harada T., Sakuma K., Kurokawa H., Sekiya N., Kato Y., Yoshida R., Kato T., Nakaoka K., Izumi T., Nabeshima F., Maeda A., Okada T., Awaji S., Civale L., Maiorov B.

    NPG Asia Materials   14 ( 1 )   2022.12

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1038/s41427-022-00432-1

    Kyutacar

    Scopus

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  • Microstructure, pinning properties, and aging of CSD-grown SmBa<inf>2</inf>Cu<inf>3</inf>O<inf>7-δ </inf>films with and without BaHfO<inf>3</inf>nanoparticles Reviewed International journal

    Hänisch J., Iida K., Cayado P., Erbe M., Grünewald L., Hatano T., Okada T., Gerthsen D., Awaji S., Holzapfel B.

    Superconductor Science and Technology   35 ( 8 )   2022.08

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1088/1361-6668/ac7b4d

    Kyutacar

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  • High-Field Critical Current Properties of (Bi, Pb)<inf>2</inf>Sr<inf>2</inf>Ca<inf>2</inf>Cu<inf>3</inf>O<inf>y</inf>Filaments Reviewed International journal

    Kobayashi D., Okada T., Awaji S.

    IEEE Transactions on Applied Superconductivity   32 ( 4 )   2022.06

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1109/TASC.2021.3129727

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  • Electronic states and energy dissipations of vortex core in pure fese single crystals investigated by microwave surface impedance measurements Reviewed International journal

    Okada T., Imai Y., Urata T., Tanabe Y., Tanigaki K., Maeda A.

    Journal of the Physical Society of Japan   90 ( 9 )   094704   2021.09

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    In order to clarify electronic states and energy dissipations due to a motion of a vortex core in pure FeSe, which is a candidate superconductor possessing a super-clean core, we measured the microwave surface impedance of pure FeSe single crystals under finite magnetic fields. From the magnetic-field dependence of the flux-flow resistivity, we found that a barometer of electronic states inside the vortex core ω0τcore is 1 ± 0.5, suggesting that the vortex core of pure FeSe is in the moderately clean regime contrary to the expectation of the super-clean core. We also found that the mean-free path inside the vortex core is suppressed at the distance of the order of the core radius. Based on observed results and previous reports, we discussed possible origins of rather small ω0τcore value in terms of the multiple-bands nature of FeSe and additional mechanisms producing extra energy dissipations specific to the vortex core in motion.

    DOI： 10.7566/JPSJ.90.094704

    Kyutacar

    Scopus

    CiNii Article

    CiNii Research

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  • In-Plane Domain Control of REBCO Coated Conductors by Annealing under Bending Strain Reviewed International journal

    Okada T., Misaizu H., Awaji S.

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   1 - 6   2021.08

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1109/TASC.2021.3063995

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  • Mechanical and critical current characteristics of high-strength (Bi, Pb)<inf>2</inf>Sr<inf>2</inf>Ca<inf>2</inf>Cu<inf>3</inf>O<inf>10+δ</inf> tapes under uniaxial tensile strain Reviewed International journal

    Okada T., Sakai K., Awaji S.

    Superconductor Science and Technology   34 ( 2 )   2021.02

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1088/1361-6668/abced2

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  • Microwave Hall effect measurement for materials in the skin depth region Reviewed International journal

    Ogawa R., Okada T., Takahashi H., Nabeshima F., Maeda A.

    Journal of Applied Physics   129 ( 1 )   015102   2021.01

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    We developed a new microwave Hall effect measurement method for materials in the skin depth region at low temperatures using a cross-shaped bimodal cavity. We analytically calculated electromagnetic fields in the cross-shaped cavity and the response of the cavity including the sample, whose property is represented by the surface impedance tensor; furthermore, we constructed the method to obtain the Hall component of the surface impedance tensor in terms of the change in resonance characteristics. To confirm the validity of the new method, we applied our method to measure the Hall effect in metallic Bi single crystals at low temperatures, and we confirmed that the microwave Hall angles coincide with the DC Hall angle. Thus, it becomes clear that the Hall angle measurement under cryogenic conditions becomes possible without any complicated tuning mechanisms, and our bimodal cavity method can be used to measure the microwave Hall effect on materials in the skin depth region. The result opens a new approach to discuss the Hall effect in condensed matter physics such as the microwave flux-flow Hall effect in superconductors.

    DOI： 10.1063/5.0033777

    Kyutacar

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  • Pinning analyses of a BaHfO<inf>3</inf>-containing GdBa<inf>2</inf>Cu<inf>3</inf>O<inf>7-δ</inf>thin film grown by chemical solution deposition Reviewed International journal

    Iida K., Cayado P., Rijckaert H., Erbe M., H nisch J., Okada T., Van Driessche I., Awaji S., Holzapfel B.

    Superconductor Science and Technology   34 ( 1 )   015009   2021.01

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1088/1361-6668/abb205

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  • Superconducting-Gap Anisotropy of Iron Pnictides Investigated via Combinatorial Microwave Measurements Reviewed International journal

    Okada T., Imai Y., Kitagawa K., Matsubayashi K., Nakajima M., Iyo A., Uwatoko Y., Eisaki H., Maeda A.

    Scientific Reports   10 ( 1 )   7064   2020.12

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    This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

    DOI： 10.1038/s41598-020-63304-0

    Kyutacar

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  • A possible explanation for double-peak structure in strain dependence of critical current density in REBa<inf>2</inf>Cu<inf>3</inf>O Reviewed International journal

    Okada T., Misaizu H., Awaji S.

    Superconductor Science and Technology   33 ( 9 )   094014   2020.09

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1088/1361-6668/aba352

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  • 3-D properties in (RE)BCO tapes measured in fields up to 35T Reviewed International journal

    Smith A.P., Raine M.J., Surrey E., Awaji S., Okada T., Hampshire D.P.

    IEEE Transactions on Applied Superconductivity   29 ( 5 )   1 - 5   2019.08

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  • Longitudinal Magnetic Field Effects on (Y,Gd)Ba<inf>2</inf>Cu<inf>3</inf>O<inf>7-δ</inf> Coated Conductor with BaHfO<inf>3</inf> Nanoparticles Fabricated by UTOC-MOD Method Reviewed International journal

    Okada T., Misaizu H., Awaji S., Nakaoka K., MacHi T., Izumi T., Miura M.

    IEEE Transactions on Applied Superconductivity   29 ( 5 )   1 - 5   2019.08

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1109/TASC.2019.2899745

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  • Development of Fluorine-Free MOD REBCO Tape With BaHfO3 Artificial Pinning Centers Reviewed International journal

    Genki Honda, Tatsuhiko Yoshihara, Makoto Inagaki, Tomohiro Ito, Tatsuoki Nagaishi, Shinichi Kobayashi, Kiyoshi Kanie, Tatsunori Okada, Satoshi Awaji

    IEEE Transactions on Applied Superconductivity ( Institute of Electrical and Electronics Engineers )   /1 - /6   2025.02

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    We fabricated REBCO films with BaHfO3 (BHO) artificial pinning centers by the Fluorine-Free MOD (FF-MOD) method on IBAD tapes. While it is known that Jc decreases as the misalignment angle increases, a high Ic of more than 500 A/4 mm-width at 77 K, self-field was obtained on the CeO2 layer with Δφ of a wide range up to 7.5 degrees. The Δφ of REBCO decreased sharply with the REBCO thickness up to 0.35 μm, suggesting that texture improvement occurred during the crystal growth of FF-MOD films, which contributed to the high Ic. The in-field Ic of REBCO with BHO was enhanced with increasing BHO content, and 171 A/4 mm-width at 20 K under 18 T was achieved. REBCO tapes over 200 m-long with 2.7 mol% BHO were fabricated, and no significant Ic drop was observed and a high average Ic of 467 A/4 mm-width at 77 K, self-field was obtained. These results show the great potential of FF-MOD tape in low-cost commercial applications.

    DOI： 10.1109/TASC.2025.3537597

    DOI： 10.1109/TASC.2025.3537597

  • Metal-Insulator Transition Behavior of (Pr1-yREy)1-xCaxCoO3 for Quench Protection of High Field Superconducting Magnets Reviewed International journal

    Kyosuke Sakurai, Yuji Tsuchiya, Masahiro Tahashi, Hideo Goto, Tatsunori Okada, Satoshi Awaji

    IEEE Transactions on Applied Superconductivity ( Institute of Electrical and Electronics Engineers )   35 ( 5 )   4701505/1 - 4701505/5   2025.01

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    Language：English   Publishing type：Research paper (scientific journal)

    REBa2Cu3Oy (REBCO) tapes are promising materials for high-field magnet applications due to their high critical current density and mechanical properties under high magnetic fields. However, REBCO coil has a problem of quench protection because of the low normal zone propagation velocity. This work explores the use of smart insulation (SI) coils utilizing metal-insulator transition (MIT) materials as turn-to-turn insulation to address quench protection challenges in REBCO coils. Specifically, perovskite-type cobalt oxides, (Pr1-yREy)1-xCaxCoO3 (RE = Sm and Y), were investigated as MIT materials for their potential application in quench protection systems. Samples were fabricated via the sol-gel method and were evaluated for their electrical resistivity ρ and MIT temperature TMIT under high magnetic fields of up to 19 T. The results show that at certain temperatures (e.g., 62.3 K in 19 T for (Pr0.8Sm0.2)0.6Ca0.4CoO3) ρ decreases significantly, confirming MIT behavior. The compound (Pr0.8Sm0.2)0.6Ca0.4CoO3 showed the lowest TMIT. Additionally, the contact resistance Rct between the layers of the SI coil was estimated from the ρ values. The Rct changed ratio by over three orders of magnitude as the temperature increased from 10 K to 270 K.

    DOI： 10.1109/TASC.2025.3532253

  • Basic design of REBCO insert coil of 33 T cryogen-free superconducting magnet Reviewed International journal

    T. Uto; T. Tosaka; T. Shitaka; H. Nezuka; S. Hanai; H. Takewa, J. Inagaki, S. Ioka, A. Badel, K. Takahashi, A. Zampa, T. Okada, Y. Tsuchiya, S. Awaji

    IEEE Transactions on Applied Superconductivity ( Institute of Electrical and Electronics Engineers )   35 ( 5 )   4601405/1 - 4601405/5   2025.01

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    A 33 T cryogen-free superconducting magnet (33 T-CSM) is under development. The 33 T-CSM consists of a REBCO insert coil and Nb3Sn/NbTi outsert coils. The REBCO insert coil is designed to generate 19 T in the external field of 14 T. The REBCO insert coil is composed of stacked 64 single pancake coils wound with two bundled REBCO tapes. The inner and outer diameters of the REBCO insert coil are 68 mm and 295 mm, respectively. The REBCO coil is impregnated with epoxy resin for conduction cooling. To prevent delamination of the superconducting layer by thermal stress, the fluorine-coated polyimide tape is co-wound with REBCO tapes and to prevent degradation of superconductivity by electromagnetic stress, reinforcing tape is also co-wound. According to 2D-FEM, it is shown that the circumferential strain ϵθ under applying electromagnetic force is 0.29%. The results of 2D-FEM also suggest that stress concentration occurs at the connection between the coil and the bus bar, and at the widthwise end of the REBCO tape. In this paper, the basic design of the insert coil and the results of FEM analysis will be described.

    DOI： 10.1109/tasc.2024.3524490

    DOI： 10.1109/tasc.2024.3524490

  • Progress of 33T cryogen-free superconducting magnet project at HFLSM Reviewed International journal

    Satoshi Awaji, Arnaud Badel, Alexandra Zampa, Kohki Takahashi, Tatsunori Okada, Yuji Tsuchiya, Tatsuro Uto, Taizo Tosaka, Hiroyuki Takewa, Hayato Nezuka, Satoshi Hanai, Masahiro Sugimoto, Ryo Taniguchi, Hiroyuki Fukushima, Kiyoshige Hirose, Shogo Muto, Shinji Fujita, Masanori Daibo

    IEEE Transactions on Applied Superconductivity ( Institute of Electrical and Electronics Engineers )   /1 - /6   2025.01

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    A 33T cryogen-free superconducting magnet (33TCSM) project is now in progress at HFLSM, IMR, Tohoku University. The 33T-CSM consists of a f 68mm- 19 T REBCO (HTS) insert and a f 320mm-14 T CuNb/Nb3Sn and NbTi Rutherford (LTS) magnets. The 33T-CSM system has been installed and tested without the HTS insert in March 2024. The LTS outsert magnet consists of three CuNb/Nb3Sn Rutherford cable coils and two NbTi Rutherford cable coils with an epoxy impregnation. It can generate 14 T in a 320 mm bore with 879 A. This winding makes use of advanced high strength CuNb/ Nb3Sn strands specifically developed for the 33T-CSM project, enabling high stress design with about 275 MPa in the Nb3Sn coil at 14 T. The 19 T-HTS insert is designed based on the robust REBCO coil technology we proposed in previous works. For the cooling system, a 9W GM/JT cryocooler is used for the LTS coils, four 4K-GM cryocoolers cool the REBCO coils (1.5 W each at 4.2 K) and two single-stage cryocoolers are used for the radiation shield and current leads. Helium circulation with compressors ensure the thermal connection between the coils and the cryocoolers. The initial cooling is about 7.3 days from room temperature. The test of the 14 T LTS magnet was successfully completed up to 839 A with the nominal maximum electromagnetic stress of 275 MPa after one training quench.

    DOI： 10.1109/tasc.2025.3525608

    DOI： 10.1109/tasc.2025.3525608

  • Effects on the Magnetic Field Stability of Coupling Currents Existing in a Two-tape Bundle of a HTS Insert Prototype Reviewed International journal

    Zampa A., Tsuchiya Y., Takahashi K., Okada T., Awaji S., Uto T., Takewa H., Hanai S., Ioka S., Inagaki J.

    IEEE Transactions on Applied Superconductivity   35 ( 5 )   4300206/1 - 4300206/6   2024.12

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    The High Field Laboratory for Superconducting Materials (HFLSM) is developing a 33 T Cryogen-free Superconducting Magnet (CSM). The major part of the magnetic field will be achieved thanks to a High Temperature Superconductor (HTS) insulated insert based on the Robust Coil concept. This design features, for each turn, two tapes wound together, in direct contact to enhance the coil's protection. However, a drawback of this architecture is the development of coupling currents caused by variations in the axial component of the magnetic field. These currents lead to additional losses and affect the quality of the magnetic field. This work focuses specifically on the impact of these coupling currents on the magnetic field quality at the location of the future samples in the context of developing a user magnet. The case study of this work is a large-scale prototype of the future HTS insert. To achieve this objective, numerical simulations were conducted to differentiate what are the qualitative effects of coupling currents and screening currents. The results showed that these currents have opposite effects on the magnetic field at the sample position. Additionally, the large-scale prototype experienced long current plateaus, during which the magnetic field was measured. The variations of the latter were driven by the relaxation of these opposing effects, each exhibiting different rates and relaxation times.

    DOI： 10.1109/TASC.2024.3514994

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  • Doping Dependence of Upper Critical Field of High-T<inf>c</inf> Cuprate Bi<inf>2+x</inf>Sr<inf>2−x</inf>CaCu<inf>2</inf>O<inf>8+δ</inf> Estimated from Irreversibility Field at Zero Temperature Reviewed International journal

    Kato J., Ishida S., Okada T., Nakagawa S., Mino Y., Higashi Y., Kashiwagi T., Awaji S., Iyo A., Ogino H., Mawatari Y., Takeshita N., Yoshida Y., Eisaki H., Nishio T.

    Journal of the Physical Society of Japan   93 ( 10 )   2024.10

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  • Quadrupling the depairing current density in the iron-based superconductor SmFeAsO<inf>1–x</inf>H<inf>x</inf> Reviewed International journal

    Miura M., Eley S., Iida K., Hanzawa K., Matsumoto J., Hiramatsu H., Ogimoto Y., Suzuki T., Kobayashi T., Ozaki T., Kurokawa H., Sekiya N., Yoshida R., Kato T., Okada T., Okazaki H., Yamaki T., Hänisch J., Awaji S., Maeda A., Maiorov B., Hosono H.

    Nature Materials   23 ( 10 )   1370 - 1378   2024.10

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1038/s41563-024-01952-7

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  • Characterization of In-Field Critical Currents in REBCO Tapes Over Wide Temperature Range by Pulsed Current Source With Supercapacitor Reviewed International journal

    Tsuchiya Y., Mizuno K., Kohama Y., Zampa A., Okada T., Awaji S.

    IEEE Transactions on Applied Superconductivity   34 ( 5 )   1 - 7   2024.08

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  • Seven-Year Operation of 25 T Cryogen-Free Superconducting Magnet as a User Magnet at HFLSM, IMR, Tohoku University Reviewed International journal

    Takahashi K., Okada T., Tsuchiya Y., Awaji S., Takewa H., Hanai S., Ioka S.

    IEEE Transactions on Applied Superconductivity   34 ( 5 )   1 - 5   2024.08

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  • Screening and Coupling Currents Induced Fields on a Large-Scale Prototype REBCO Insulated Coil Reviewed International journal

    Zampa A., Takahashi K., Tsuchiya Y., Okada T., Awaji S., Uto T., Takewa H., Hanai S., Ioka S., Inagaki J.

    IEEE Transactions on Applied Superconductivity   34 ( 5 )   1 - 5   2024.08

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  • Critical Current Correlations and Regressions Across the Superconducting Parameter Space of REBCO Wires, B||c Reviewed International journal

    Greenberg A., Cheng J.L., Francis A., Shepherd M., Okada T., Awaji S., Sorbom B.

    IEEE Transactions on Applied Superconductivity   34 ( 5 )   1 - 5   2024.08

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  • Conceptual Design of a 33 T Cryogen-Free Magnet REBCO Insert: Mechanical Aspects and Protection Against Thermal Runaway Reviewed International journal

    Badel A., Takahashi K., Zampa A., Okada T., Tsuchiya Y., Awaji S., Uto T., Tosaka T., Takewa H., Nezuka H., Hanai S.

    IEEE Transactions on Applied Superconductivity   34 ( 5 )   1 - 5   2024.08

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  • Role of defects in increasing the critical current density of reel-to-reel PLD (Eu,Er)Ba<inf>2</inf>Cu<inf>3</inf>O<inf>y</inf>+BaHfO<inf>3</inf>-coated conductors Reviewed International journal

    Suzuki T., Sakuma K., Ohta J., Ogimoto Y., Takahashi K., Ozaki T., Ibi A., Izumi T., Yamaki T., Okazaki H., Yamamoto S., Koshikawa H., Okada T., Awaji S., Miura M.

    Japanese Journal of Applied Physics   63 ( 6 )   2024.06

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.35848/1347-4065/ad45d0

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  • Modulation of vortex pinning by matrix defects in YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7</inf>nanocomposite film Reviewed International journal

    Horide T., Higashi K., Ishimaru M., Okada T., Awaji S., Matsumoto K.

    Superconductor Science and Technology   36 ( 10 )   2023.10

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1088/1361-6668/acecad

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  • BaMO<inf>3</inf>(M = Zr, Hf) Doped REBCO Tapes Fabricated by Fluorine-Free MOD Reviewed International journal

    Yoshihara T., Honda G., Nagaishi T., Kobayashi S., Kanie K., Okada T., Awaji S.

    IEEE Transactions on Applied Superconductivity   33 ( 5 )   1 - 5   2023.08

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  • First Validation of Robust REBCO Insert Concept on a Large 20-Pancake Prototype Reaching Up to 25 T Reviewed International journal

    Badel A., Takahashi K., Zampa A., Okada T., Nishijima G., Uto T., Takewa H., Hanai S., Ioka S., Inagaki J., Awaji S.

    IEEE Transactions on Applied Superconductivity   33 ( 5 )   4601505/1 - 4601505/5   2023.08

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1109/TASC.2023.3255178

    Kyutacar

    Scopus

    Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85151453731&origin=inward

  • Effects of Precursor Film Thickness and Heat-Treatment Temperature On Joint Rate for a GdBa<inf>2</inf>Cu<inf>3</inf>O<inf>y</inf>Superconducting Joint Reviewed International journal

    Doi Y., Teranishi R., Miyajima T., Matsumoto A., Petrykin V., Lee S., Okada T., Awaji S.

    IEEE Transactions on Applied Superconductivity   32 ( 6 )   1 - 4   2022.09

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  • Finite Element Analysis of AC Losses in Pancake Coils Wound Using Two-Ply Bundle Conductor Reviewed International journal

    Kajikawa K., Miezaki M., Fujiwara Y., Awaji S., Badel A., Takahashi K., Okada T., Abe T.

    IEEE Transactions on Applied Superconductivity   32 ( 6 )   1 - 5   2022.09

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  • Mechanical Properties of Four-Stacked Two Tape Bundled REBCO Pancake Coils Reviewed International journal

    Takahashi K., Badel A., Okada T., Awaji S., Miyazaki H., Hanai S., Ioka S.

    IEEE Transactions on Applied Superconductivity   32 ( 6 )   1 - 5   2022.09

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  • REBCO Coil With Robust Behavior Against Local Defects Wound Using Two-Tape Bundle Reviewed International journal

    Abe T., Badel A., Okada T., Awaji S., Fujita S., Tsuchiya K., Iijima Y., Daibo M.

    IEEE Transactions on Applied Superconductivity   32 ( 6 )   1 - 6   2022.09

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  • Microstructure, pinning properties, and aging of CSD-grown SmBa2Cu3O7−δ films with and without BaHfO3 nanoparticles Reviewed International journal

    Hänisch Jens, Iida Kazumasa, Cayado Pablo, Erbe Manuela, Grünewald Lukas, Hatano Takafumi, Okada Tatsunori, Gerthsen Dagmar, Awaji Satoshi, Holzapfel Bernhard

    Superconductor Science and Technology   35 ( 8 )   084009   2022.07

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    In order to improve the electrical transport properties of REBa2Cu3O7−δ nanocomposite films, SmBa2Cu3O7−δ films with and without BaHfO3 nanoparticles were grown by chemical solution deposition, and their microstructural and transport properties were investigated in a detailed study using transmission electron microscopy and transport measurements in magnetic fields up to 24 T. The optimization process of the crystallization step (temperature and oxygen partial pressure) as well as an aging effect, which is due to the release of trapped fluorine, are described. Critical temperature and critical current densities surprisingly improve initially during the aging. Due to the complex microstructure, the additional BaHfO3 nanoparticles have only a positive effect at low magnetic fields for our samples.

    CiNii Research

    Other Link： https://kyutech.repo.nii.ac.jp/records/2001307

  • AC Loss Measurements in an HTS Coil Wound Using Two-Ply Bundle Conductor Reviewed International journal

    Kajikawa K., Fujiwara Y., Miezaki M., Awaji S., Badel A., Takahashi K., Okada T., Abe T., Fujita S., Muto S., Tsuchiya K., Iijima Y., Daibo M.

    IEEE Transactions on Applied Superconductivity   32 ( 4 )   1 - 5   2022.06

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  • Development and large volume production of extremely high current density YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7</inf> superconducting wires for fusion Reviewed International journal

    Molodyk A., Samoilenkov S., Markelov A., Degtyarenko P., Lee S., Petrykin V., Gaifullin M., Mankevich A., Vavilov A., Sorbom B., Cheng J., Garberg S., Kesler L., Hartwig Z., Gavrilkin S., Tsvetkov A., Okada T., Awaji S., Abraimov D., Francis A., Bradford G., Larbalestier D., Senatore C., Bonura M., Pantoja A.E., Wimbush S.C., Strickland N.M., Vasiliev A.

    Scientific Reports   11 ( 1 )   2021.12

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1038/s41598-021-81559-z

    Kyutacar

    Scopus

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  • Electromagnetic Characteristics Study of Two-Ply REBCO Tapes Pancake Coils Reviewed International journal

    Takahashi K., Okada T., Badel A., Awaji S., Miyazaki H., Hanai S., Ioka S.

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   1 - 5   2021.08

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  • Detection and Protection against Quench/Local Thermal Runaway for a 30 T Cryogen-Free Magnet Reviewed International journal

    Badel A., Okada T., Takahashi K., Fujita S., Miyazaki H., Ioka S., Awaji S.

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   1 - 5   2021.08

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  • Robust REBCO Insert Coil for Upgrade of 25 T Cryogen-Free Superconducting Magnet Reviewed International journal

    Awaji S., Badel A., Okada T., Takahashi K., Miyazaki H., Hanai S., Ioka S., Fujita S., Muto S., Iijima Y., Daibo M., Kajikawa K.

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   2021.08

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    Language：English   Publishing type：Research paper (scientific journal)

    DOI： 10.1109/TASC.2021.3061896

    Scopus

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  • AC losses and induced fields in HTS coil wound using two-ply coated conductors Reviewed International journal

    Yokoyama H., Zhu B., Kajikawa K., Awaji S., Badel A., Takahashi K., Okada T.

    Journal of Physics: Conference Series   1559 ( 1 )   2020.06

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    Language：English   Publishing type：Research paper (international conference proceedings)

    DOI： 10.1088/1742-6596/1559/1/012130

    Kyutacar

    Scopus

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  • Mechanical Properties of BaHfO<inf>3</inf>-Doped EuBCO Coated Conductors Fabricated by Hot-Wall PLD on IBAD Template Reviewed International journal

    Fujita S., Muto S., Iijima Y., Daibo M., Okada T., Awaji S.

    IEEE Transactions on Applied Superconductivity   30 ( 4 )   1 - 5   2020.06

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  • Field Stability Analysis of 25 T Cryogen-Free Superconducting Magnet and Upgrade Plans for 30 T System at HFLSM, IMR, Tohoku University Reviewed International journal

    Awaji S., Imai Y., Takahashi K., Okada T., Badel A., Miyazaki H., Hanai S., Ioka S.

    IEEE Transactions on Applied Superconductivity   29 ( 5 )   1 - 5   2019.08

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  • 3-D properties in (RE)BCO tapes measured in fields up to 35T Reviewed International journal

    Smith Andrew P., Raine Mark J., Surrey Elizabeth, Awaji Satoshi, Okada Tatsunori, Hampshire Damian P.

    IEEE Transactions on Applied Superconductivity   29 ( 5 )   2019.01

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    Language：English   Publishing type：Research paper (scientific journal)

    We have measured the temperature and angular dependence of the upper critical field (BC 2 ) for three state of the art (RE)BCO HTS tapes using variable-temperature ac susceptibility measurements in applied fields up to 35 T. The three tapes measured were a Fujikura tape without artificial pinning centers and Superpower tapes with and without artificial pinning centers. We have obtained fits to our B C2 (T, θ) data using both the anisotropic Ginzburg-Landau (G-L) and Klemm's models for layered superconductors. Our calculations suggest that these tapes are three-dimensional (3-D) at all temperatures in zero field but become 2-D in magnetic fields above a crossover field of 457/γ T, where γ = √m c /m ab is the G-L anisotropy parameter. The values of γ were measured and show that the 3-D-2-D crossover fields in these tapes are at least 130 T.

    CiNii Research

    Other Link： https://kyutech.repo.nii.ac.jp/records/2001303

  • Microstructures of superconducting joint between GdBa<inf>2</inf>Cu<inf>3</inf>O<inf>y</inf>-coated conductors via additionally deposited precursor films Reviewed International journal

    Miyajima T., Teranishi R., Yasuyama S., Sato Y., Kaneko K., Maeda T., Ochi M., Hiramatsu K., Nakamura M., Petrykin V., Lee S., Okada T., Awaji S.

    Japanese Journal of Applied Physics   58 ( 5 )   050913   2019.01

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  • Influence of joint pressure on superconducting and mechanical properties for jointed GdBa<inf>2</inf>Cu<inf>3</inf>O<inf>y</inf> coated conductors via precursor films Reviewed International journal

    Miyajima T., Teranishi R., Yasuyama S., Sato Y., Kaneko K., Petrykin V., Lee S., Okada T., Awaji S., Matsumoto A.

    Japanese Journal of Applied Physics   58 ( 5 )   050907   2019.01

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  • Flux-pinning properties of BaHfO <inf>3</inf> -doped EuBCO-coated conductors fabricated by Hot-Wall PLD Reviewed International journal

    Fujita S., Muto S., Hirata W., Yoshida T., Kakimoto K., Iijima Y., Daibo M., Kiss T., Okada T., Awaji S.

    IEEE Transactions on Applied Superconductivity   29 ( 5 )   1 - 5   2019.01

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  • Development of Long-Length BMO-Doped REBCO Coated Conductors by Hot-Wall PLD Process Reviewed International journal

    Fujita S., Muto S., Hirata W., Adachi Y., Yoshida T., Igarashi M., Kakimoto K., Iijima Y., Naoe K., Kiss T., Okada T., Awaji S.

    IEEE Transactions on Applied Superconductivity   28 ( 4 )   1 - 4   2018.06

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