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  • Tetsuo Oka
2019

Improvement of the trapped field of REBCO bulk activated by pulsed field magnetization with a large soft-iron yoke

Yokoyama, K. & Oka, T., 2019 Oct 15, In : Journal of Physics: Conference Series. 1293, 1, 012046.

Research output: Contribution to journalConference article

Open Access
2018

Magnetizing performance evaluation of HTS bulk magnet using a 12 K refrigerator with high cooling capacity

Yokoyama, K., Katsuki, A., Miura, A. & Oka, T., 2018 Aug 13, (Accepted/In press) In : IEEE Transactions on Applied Superconductivity.

Research output: Contribution to journalArticle

2019
2018

Feasible Applications of Bulk HTS Magnets and Magnetic Field-Capturing Characteristics in Their Activation Processes

Oka, T., Takeda, A., Shimizu, K., Higa, K., Tsunoda, S., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Nakamura, T., 2018 Aug 28, (Accepted/In press) In : IEEE Transactions on Applied Superconductivity.

Research output: Contribution to journalArticle

1 Citation (Scopus)
2016

Uniform Magnetic Field between Face-to-Face HTS Bulk Magnets Combining Concave and Convex Magnetic Field Distributions

Oka, T., Takahashi, Y., Yaginuma, S., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Nakamura, T., 2016 Jan 1, In : Physics Procedia. 81, p. 45-48 4 p.

Research output: Contribution to journalConference article

5 Citations (Scopus)
2019

Generation of Uniform Magnetic Field between Face-to-Face HTS Bulk Magnets

Oka, T., Higa, K., Tsunoda, S., Ogawa, J., Fukui, S., Inoue, N., Miryala, M., Murakami, M., Yokoyama, K. & Nakamura, T., 2019 Oct 15, In : Journal of Physics: Conference Series. 1293, 1, 012044.

Research output: Contribution to journalConference article

Open Access
1 Citation (Scopus)
2020

Optimization of Carbon Encapsulated Boron Doping for High-Performance Bulk Sintered MgB2

Sai Srikanth, A., Muralidhar, M., Sunsanee, P., Jirsa, M., Sakai, N., Oka, T. & Murakami, M., 2020, (Accepted/In press) In : Advanced Engineering Materials.

Research output: Contribution to journalArticle

Open Access

Magnetizing characteristic evaluation of REBCO bulk in PFM using different yokes

Yokoyama, K. & Oka, T., 2020 Jun 19, In : Journal of Physics: Conference Series. 1559, 1, 012047.

Research output: Contribution to journalConference article

Open Access

Novel magnetizing technique using high temperature superconducting bulk magnets for permanent magnets in interior permanent magnet rotors

Oka, T., Hasebe, S., Ogawa, J., Fukui, S., Nakano, T., Sakai, N., Miryala, M., Murakami, M. & Yokoyama, K., 2020 Aug, In : Superconductor Science and Technology. 33, 8, 084003.

Research output: Contribution to journalArticle

2017

Influence of Artificial Defects on Trapped Field Performance in a Superconducting Bulk Magnet

Yokoyama, K., Eranda, K., Zhao, Y., Katsuki, A., Miura, A. & Oka, T., 2017 Jul 26, In : Journal of Physics: Conference Series. 871, 1, 012050.

Research output: Contribution to journalConference article

1 Citation (Scopus)
2018

Modeling of Magnetization Loss in HTS Tape Exposed to All Magnetic Field Directions

Ogawa, J., Fukui, S., Oka, T., Panpan, Y. & Kanamori, K., 2018 Apr 1, In : IEEE Transactions on Applied Superconductivity. 28, 3, 8239653.

Research output: Contribution to journalArticle

1 Citation (Scopus)
2017

Magnetic Separation Using HTS Bulk Magnet for Cs-Bearing Fe precipitates

Oka, T., Ichiju, K., Sasaki, S., Ogawa, J., Fukui, S., Sato, T., Ooizumi, M., Yokoyama, K., Aoki, S. & Ohnishi, N., 2017 Sep 21, In : Journal of Physics: Conference Series. 897, 1, 012024.

Research output: Contribution to journalConference article

1 Citation (Scopus)
2018

Magnetic Flux Invasion and Field-Capturing in Pulsed-Field Magnetization for Layered MgB<formula><tex>$_2$</tex></formula> Bulk Magnets

Oka, T., Takeda, A., Sasaki, S., Ogawa, J., Fukui, S., Sato, T., Haessler, W. & Yokoyama, K., 2018 Jan 11, (Accepted/In press) In : IEEE Transactions on Applied Superconductivity.

Research output: Contribution to journalArticle

2020

Influence of the Shape of Soft-Iron Yoke on Trapped Field Performance of HTS Bulk

Yokoyama, K. & Oka, T., 2020 Jun, In : IEEE Transactions on Applied Superconductivity. 30, 4, 9007667.

Research output: Contribution to journalArticle

2016

Magnetic Field Direction Dependence of AC Losses in Bi2223/Ag Tape

Ogawa, J., Fukui, S., Oka, T., Shidara, N., Iwashita, R. & Ohya, M., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7377072.

Research output: Contribution to journalArticle

2017

Experimental investigation of AC loss characteristics in HTS tape with rotating magnetic field

Ogawa, J., Fukui, S., Oka, T., Sano, Y., Ogawa, M. & Ranecky, S. T., 2017 Jun 1, In : IEEE Transactions on Applied Superconductivity. 27, 4, 7812682.

Research output: Contribution to journalArticle

2 Citations (Scopus)
2016

Magnetic Separation for Recovering Ni Compounds from Plating Waste with Use of HTS Bulk Magnets

Oka, T., Takayanagi, Y., Machida, S., Ichiju, K., Fukui, S., Ogawa, J., Sato, T., Ooizumi, M., Tsujimura, M. & Yokoyama, K., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7383257.

Research output: Contribution to journalArticle

8 Citations (Scopus)
2017

Magnetic flux invasion in REBCO bulk magnets with varying pre-magnetized flux distributions in multiple-PFM processes

Oka, T., Hara, K., Takeda, A., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Murakami, A., 2017 Jul 26, In : Journal of Physics: Conference Series. 871, 1, 012049.

Research output: Contribution to journalConference article

1 Citation (Scopus)
2019
2020

Investigation of flux jumps during pulsed field magnetization in graphene-Added MgB2 bulks

Yokoyama, K., Oka, T., Berger, K., Dorget, R., Koblischka, M., Grigoroscuta, M., Burdusel, M., Batalu, D., Aldica, G., Badica, P., Sakai, N., Muralidhar, M. & Murakami, M., 2020 Jun 19, In : Journal of Physics: Conference Series. 1559, 1, 012080.

Research output: Contribution to journalConference article

Open Access
2016

Experimental Investigation of AC Loss Characteristics of Stacked HTS Tapes in an Iron Core

Ogawa, J., Fukui, S., Oka, T., Sakurai, T., Sano, Y., Tada, H. & Yoshii, Y., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7435291.

Research output: Contribution to journalArticle

8 Citations (Scopus)
2018

A review article: Compact magnetic field generators containing HTS bulk magnets cooled by refrigerators and their feasible applications

Oka, T., Ogawa, J., Fukui, S., Sato, T., Nakano, T., Yokoyama, K., Nakamura, T., Fujishiro, H. & Noto, K., 2018 Jan 1, High-Temperature Superconductors: Occurrence, Synthesis and Applications. Nova Science Publishers, Inc., p. 291-306 16 p.

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Citations (Scopus)

Collecting Ni-Sulfate Compound from Electroless Plating Waste by Magnetic Separation Technique with Use of HTS Bulk Magnets

Oka, T., Sasaki, S., Sasaki, H., Fukui, S., Ogawa, J., Sato, T., Nakano, T., Ooizumi, M., Tsujimura, M. & Yokoyama, K., 2018 Jul 26, In : Journal of Physics: Conference Series. 1054, 1, 012047.

Research output: Contribution to journalConference article

2017

Experimental and theoretical study of AC losses in variable asymmetrical magnetic environments

Ranecky, S. T., Watanabe, H., Ogawa, J., Oka, T., Gölden, D., Alff, L. & Genenko, Y. A., 2017 Jul 6, In : Superconductor Science and Technology. 30, 8, 085005.

Research output: Contribution to journalArticle

5 Citations (Scopus)
2020

Recent progress in production of infiltration-growth and melt-growth processed bulk (RE)Ba2Cu3Oy

Muralidhar, M., Sunsanee, P., Takemura, K., Sai Srikanth, A., Jirsa, M., Ramachandra Rao, M. S., Oka, T., Sakai, N. & Murakami, M., 2020 Jul, In : Superconductor Science and Technology. 33, 7, 074002.

Research output: Contribution to journalArticle

Open Access
2019

Infiltration growth processing of bulk mixed REBa 2 Cu 3 O 7-x superconductors: Nano-metal oxides and rare earth elements effects on micro-structural properties

Pavan Kumar Naik, S., Nagaveni, K., Swarup Raju, P. M., Miryala, M., Koblischka, M. R., Koblischka-Veneva, A. D., Oka, T., Iwasa, Y., Ogino, H., Eisaki, H. & Murakami, M., 2019 Jan 1, Superconductivity and Particle Accelerators 2018. Bocian, D. & Romaniuk, R. S. (eds.). SPIE, 110540H. (Proceedings of SPIE - The International Society for Optical Engineering; vol. 11054).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)
2016

Development of a Desktop-Type Superconducting Bulk Magnet

Yokoyama, K., Kulawansha, E., Yuanding, Z. & Oka, T., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7386635.

Research output: Contribution to journalArticle

8 Citations (Scopus)
2018

Development of Engineering Education Program for Students before Starting Graduation Researches on Forefront Technologies

Oka, T., Suzuki, T., Abe, K., Yamauchi, T., Yamagiwa, K., Sato, T., Tanabe, Y. & Narumi, T., 2018 Sep 17, Proceedings - 2017 7th World Engineering Education Forum, WEEF 2017- In Conjunction with: 7th Regional Conference on Engineering Education and Research in Higher Education 2017, RCEE and RHEd 2017, 1st International STEAM Education Conference, STEAMEC 2017 and 4th Innovative Practices in Higher Education Expo 2017, I-PHEX 2017. Institute of Electrical and Electronics Engineers Inc., p. 136-139 4 p. 8467132

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)
2020

Formation of uniform magnetic flux distribution for NMR magnets using HTS bulk magnets activated by pulsed-field magnetization

Oka, T., Inoue, N., Tsunoda, S., Ogawa, J., Fukui, S., Yokoyama, K., Sakai, N., Miryala, M., Murakami, M., Takahashi, M. & Nakamura, T., 2020 May, In : Materials Research Express. 7, 5, 056001.

Research output: Contribution to journalArticle

Open Access
2018

AC loss distribution in two-layer HTS cable

Ogawa, J., Fukui, S., Oka, T., Ogawa, T. & Sugai, M., 2018 Apr 1, In : IEEE Transactions on Applied Superconductivity. 28, 3, 5900104.

Research output: Contribution to journalArticle

2 Citations (Scopus)
2020

Magnetizing Technique for Permanent Magnets in IPM Motor Rotors Using HTS Bulk Magnet

Oka, T., Hasebe, S., Ogawa, J., Fukui, S., Nakano, T., Yokoyama, K., Miryala, M., Sakai, N. & Murakami, M., 2020 Jun, In : IEEE Transactions on Applied Superconductivity. 30, 4, 9072631.

Research output: Contribution to journalArticle

2018

Strong magnetic field generation by superconducting bulk magnets using various types of refrigerators and considering an efficient magnetization

Yokoyama, K. & Oka, T., 2018 Jan 1, High-Temperature Superconductors: Occurrence, Synthesis and Applications. Nova Science Publishers, Inc., p. 369-385 17 p.

Research output: Chapter in Book/Report/Conference proceedingChapter

2019

International individual internship based on research collaboration on engineering education and academic science

Oka, T., Murakami, M., Sengoku, M., Sato, T., Ogawa, J., Yamagiwa, K., Suzuki, T., Nishimura, S. Y. & Kaneko, F., 2019 Jan 29, 2018 World Engineering Education Forum - Global Engineering Deans Council, WEEF-GEDC 2018. Institute of Electrical and Electronics Engineers Inc., 8629681. (2018 World Engineering Education Forum - Global Engineering Deans Council, WEEF-GEDC 2018).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2018

Enhancement of Trapped Magnetic Field Using a Large-Size REBCO Bulk in a Desktop Type Superconducting Bulk Magnet

Yokoyama, K., Katsuki, A., Miura, A. & Oka, T., 2018 Apr 1, In : IEEE Transactions on Applied Superconductivity. 28, 3, 8187669.

Research output: Contribution to journalArticle

1 Citation (Scopus)
2019

Study on Magnetic Flux Dissipation and Field-Trapping Performance of HTS Bulk-Shaped Magnesium Diboride in Pulse-Field Magnetizing Processes

Oka, T., Takeda, A., Oki, H., Ogawa, J., Fukui, S., Scheiter, J., Häßler, W., Yokoyama, K., Yamanaka, K., Dadiel, L., Miryala, M., Sakai, N., Murakami, M. & Noudem, J., 2019 Aug, In : IEEE Transactions on Applied Superconductivity. 29, 5, 8678817.

Research output: Contribution to journalArticle

1 Citation (Scopus)
2020

Occurrence of Flux Jumps in MgB2 Bulk Magnets during Pulse-Field Magnetization

Sakai, N., Oka, T., Yamanaka, K., Dadiel, L., Oki, H., Ogawa, J., Fukui, S., Scheiter, J., Häßler, W., Yokoyama, K., Noudem, J., Miryala, M. & Murakami, M., 2020 Jun 19, In : Journal of Physics: Conference Series. 1559, 1, 012024.

Research output: Contribution to journalConference article

Open Access
2017

Pulse-Field Magnetization for Disc-Shaped MgB2 Bulk Magnets

Miyazaki, T., Fukui, S., Ogawa, J., Sato, T., Oka, T., Scheiter, J., Hasler, W., Kulawansha, E., Yuanding, Z. & Yokoyama, K., 2017 Jun 1, In : IEEE Transactions on Applied Superconductivity. 27, 4, 7782353.

Research output: Contribution to journalArticle

5 Citations (Scopus)
2018

Magnetic Flux Invasion and Field-Capturing in Pulsed-Field Magnetization for Layered MgB2 Bulk Magnets

Oka, T., Takeda, A., Sasaki, S., Ogawa, J., Fukui, S., Sato, T., Scheiter, J., Häßler, W., Katsuki, J., Miura, A. & Yokoyama, K., 2018 Jun, In : IEEE Transactions on Applied Superconductivity. 28, 4, 8255574.

Research output: Contribution to journalArticle

6 Citations (Scopus)
2020
Open Access
2016

Influence of the Position of a Small Hole on the Trapped Field Performance in a Holed Superconducting Bulk Magnet

Yokoyama, K., Kulawansha, M. P. E. S., Yuanding, Z. & Oka, T., 2016 Apr 1, In : IEEE Transactions on Applied Superconductivity. 26, 3, 7416160.

Research output: Contribution to journalArticle

3 Citations (Scopus)
2020

Efforts toward practical application of uniform magnetic field using superconducting bulk magnets

Nakamura, T., Yokoyama, K., Oka, T., Kim, S. B. & Izumi, M., 2020, In : IEEJ Transactions on Power and Energy. 140, 3, p. 162-165 4 p.

Research output: Contribution to journalArticle

2018

Comparison of Trapped Field Characteristic of Bulk Magnet System Using Various Type Refrigerators

Yokoyama, K., Katsuki, A., Miura, A. & Oka, T., 2018 Jul 26, In : Journal of Physics: Conference Series. 1054, 1, 012072.

Research output: Contribution to journalConference article

1 Citation (Scopus)
2016

Selective Magnetic Field Invasion into HTS Bulk Magnets in Pulse Field Magnetizing Processes

Oka, T., Hara, K., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K., Murakami, A. & Langer, M., 2016 Apr, In : IEEE Transactions on Applied Superconductivity. 26, 3, 7405303.

Research output: Contribution to journalArticle

3 Citations (Scopus)
2019
Open Access
6 Citations (Scopus)