Tetsuo Oka

  • 1918 Citations
  • 22 h-Index
1990 …2020

Research output per year

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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

2019
Open Access
4 Citations (Scopus)

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

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)
1 Citation (Scopus)

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)

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

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

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

3 Citations (Scopus)

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

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

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)

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)

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

3 Citations (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

7 Citations (Scopus)

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

7 Citations (Scopus)

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)

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

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)

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 1, In : IEEE Transactions on Applied Superconductivity. 26, 3, 7405303.

Research output: Contribution to journalArticle

3 Citations (Scopus)
2015

A Numerical Proposal of an After Heating Method for Pulse Field Magnetization for HTS Bulk Magnets

Ogawa, J., Oka, T., Fukui, S., Sato, T. & Watanabe, N., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 6945334.

Research output: Contribution to journalArticle

Improvement of the trapped field performance of a holed superconducting bulk magnet

Yokoyama, K., Igarashi, R., Togasaki, R. & Oka, T., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 7006763.

Research output: Contribution to journalArticle

2 Citations (Scopus)

Magnetization behavior of RE123 bulk magnets bearing twin seed-crystals in pulsed field magnetization processes

Oka, T., Miyazaki, T., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Langer, M., 2015 Dec 17, In : Superconductor Science and Technology. 29, 2, 024003.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Preferential magnetic flux invasion and heat generation owing to macrostructure in HTS bulk magnets in pulse field magnetization processes

Oka, T., Ota, H., Shimoda, T., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K., Murakami, A. & Langer, M., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 6980106.

Research output: Contribution to journalArticle

3 Citations (Scopus)

Pulsed field magnetization characteristics of a holed superconducting bulk magnet

Yokoyama, K., Igarashi, R., Togasaki, R. & Oka, T., 2015 Jun 25, In : Physica C: Superconductivity and its Applications. 518, p. 117-121 5 p.

Research output: Contribution to journalArticle

2 Citations (Scopus)
2014

Collection of Ni-bearing material from electroless plating waste by magnetic separation with HTS bulk magnet

Oka, T., Fukazawa, H., Fukui, S., Ogawa, J., Sato, T., Ooizumi, M., Tsujimura, M. & Yokoyama, K., 2014 Jan 15, In : Physica C: Superconductivity and its applications. 496, C, p. 58-62 5 p.

Research output: Contribution to journalArticle

11 Citations (Scopus)

Influence of the arrangement of HTS tapes inserted in an iron core on AC loss characteristics

Ogawa, J., Fukui, S., Oka, T., Sato, T., Fushimi, A. & Shoda, T., 2014 Jan 1, In : IEEE Transactions on Applied Superconductivity. 24, 3, 6595123.

Research output: Contribution to journalArticle

4 Citations (Scopus)

Magnetic separation technique using high temperature superconducting bulk magnets and application to plating liquid waste treatment

Oka, T., Fukazawa, H., Yoshizawa, N., Takayanagi, Y., Ogawa, J., Fukui, S., Sato, T., Ooizumi, M., Tsujimura, M. & Yokoyama, K., 2014 Jan 1, In : Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 61, SUPLL.1, p. S164-S166

Research output: Contribution to journalArticle

Numerical study of the influence of material properties on pulsed-field magnetization for hts bulk magnets

Ogawa, J., Oka, T., Fukui, S., Sato, T., Watanabe, N. & Basir, Z. M., 2014 Jan 1, In : IEEE Transactions on Applied Superconductivity. 24, 3, 6600815.

Research output: Contribution to journalArticle

3 Citations (Scopus)

Strong magnetic field generator containing HTS bulk magnets and compact refrigerators

Oka, T., Hirayama, E., Kanai, T., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Nakamura, T., 2014 Jan 1, In : IEEE Transactions on Applied Superconductivity. 24, 3, 6626624.

Research output: Contribution to journalArticle

20 Citations (Scopus)
2013

Development and test of model apparatus of non-contact spin processor for photo mask production applying radial-type superconducting magnetic bearing

Saito, K., Fukui, S., Maezawa, M., Ogawa, J., Oka, T. & Sato, T., 2013 Jan 15, In : Physica C: Superconductivity and its applications. 484, p. 321-324 4 p.

Research output: Contribution to journalArticle

2 Citations (Scopus)

Evaluation of pulsed-field magnetization of a bulk superconductor with small holes

Yokoyama, K., Oka, T., Kondo, N. & Hosaka, S., 2013 Feb 11, In : IEEE Transactions on Applied Superconductivity. 23, 3, 6403884.

Research output: Contribution to journalArticle

3 Citations (Scopus)

Flux-invading behaviors and temperature changes in Dy123 bulk magnet in iterative pulse field magnetization process

Oka, T., Ishiduka, D., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K., Murakami, A. & Stopfel, H., 2013 May 6, In : Physica C: Superconductivity and its applications. 494, p. 46-49 4 p.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Learn-by-doing engineering education programs driven by the engineers of private companies and societies

Oka, T., Harada, S., Tanabe, Y., Narumi, T., Kaneko, F., Sugawara, A., Ishii, N., Nishimura, S., Maruyama, T., Sengoku, M., Ohkawa, H. & Tsubokawa, N., 2013 May 10, In : IEEJ Transactions on Fundamentals and Materials. 133, 4, p. 180-185+6

Research output: Contribution to journalArticle

Magnetic and thermal properties of HTS bulk magnet in the pulsed-field magnetizing process

Oka, T., Ishiduka, D., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Murakami, A., 2013 Apr 1, In : Journal of Superconductivity and Novel Magnetism. 26, 4, p. 1301-1306 6 p.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Magnetic precipitate separation for Ni plating waste liquid using HTS bulk magnets

Oka, T., Kimura, T., Mimura, D., Fukazawa, H., Fukui, S., Ogawa, J., Sato, T., Ooizumi, M., Yokoyama, K., Tsujimura, M. & Terasawa, T., 2013 Jan 15, In : Physica C: Superconductivity and its applications. 484, p. 325-328 4 p.

Research output: Contribution to journalArticle

3 Citations (Scopus)

Measurement and numerical analysis of dependence of ac loss in polygonal conductor assembled by YBCO tapes on gap length between neighboring tapes

Fukui, S., Hatakeyama, S., Nanayama, J., Maruko, A., Ogawa, J., Sato, T., Oka, T. & Tsukamoto, O., 2013 Feb 12, In : IEEE Transactions on Applied Superconductivity. 23, 3, 6407801.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Pulsed-field magnetization of a bulk superconductor with small holes

Yokoyama, K., Oka, T., Kondo, N. & Hosaka, S., 2013 Jan 15, In : Physica C: Superconductivity and its applications. 484, p. 343-347 5 p.

Research output: Contribution to journalArticle

6 Citations (Scopus)
2012

Experimental investigation of loss characteristics with AC and DC offset transport current in HTS double pancake coil

Ogawa, J., Fukui, S., Oka, T., Sato, T., Shibayama, M., Egawa, M. & Sato, A., 2012 Jun 25, In : IEEE Transactions on Applied Superconductivity. 22, 3, 4705004.

Research output: Contribution to journalArticle

7 Citations (Scopus)

Influence of AC transport current balance on AC loss in a two layered polygonal YBCO assembled conductor

Ogawa, J., Fukui, S., Oka, T., Sato, T., Tamura, A., Kasuga, E. & Ryu, K. W., 2012 Jun 25, In : IEEE Transactions on Applied Superconductivity. 22, 3, 4704804.

Research output: Contribution to journalArticle

2 Citations (Scopus)

Magnetic field distribution of permanent magnet magnetized by static magnetic field generated by HTS bulk magnet

Oka, T., Kawasaki, N., Fukui, S., Ogawa, J., Sato, T., Terasawa, T., Itoh, Y. & Yabuno, R., 2012 Jun 25, In : IEEE Transactions on Applied Superconductivity. 22, 3, 6101562.

Research output: Contribution to journalArticle

6 Citations (Scopus)

Magnetizing of permanent magnets using HTS bulk magnets

Oka, T., Muraya, T., Kawasaki, N., Fukui, S., Ogawa, J., Sato, T. & Terasawa, T., 2012 Jan 1, In : Cryogenics. 52, 1, p. 27-31 5 p.

Research output: Contribution to journalArticle

2 Citations (Scopus)

Measurement and numerical analysis of AC loss in high temperature superconducting coil

Fukui, S., Shibayama, M., Ogawa, J., Oka, T., Sato, T., Takao, T. & Tsukamoto, O., 2012 Jun 25, In : IEEE Transactions on Applied Superconductivity. 22, 3, 4704904.

Research output: Contribution to journalArticle

3 Citations (Scopus)

Numerical study of optimization design of high temperature superconducting field winding in 20 MW synchronous motor for ship propulsion

Fukui, S., Kawai, T., Takahashi, M., Ogawa, J., Oka, T., Sato, T. & Tsukamoto, O., 2012 Jun 25, In : IEEE Transactions on Applied Superconductivity. 22, 3, 5200504.

Research output: Contribution to journalArticle

12 Citations (Scopus)

Pulsed-field magnetization of a superconducting bulk magnet after field cooling using a permanent magnet

Yokoyama, K., Oka, T. & Noto, K., 2012 Jun 25, In : IEEE Transactions on Applied Superconductivity. 22, 3, 6094195.

Research output: Contribution to journalArticle

2011

Development and test of model apparatus utilizing HTS magnetic levitation for non-contact spinning clean-up processors of photo mask production

Saito, K., Fukui, S., Ogawa, J., Oka, T., Sato, T., Sorimachi, S. & Miyazaki, S., 2011 Jun 1, In : IEEE Transactions on Applied Superconductivity. 21, 3 PART 2, p. 2241-2244 4 p., 5617305.

Research output: Contribution to journalArticle

2 Citations (Scopus)

Evaluation of pulsed-field magnetization on a superconducting bulk magnet system using a 13 K refrigerator

Yokoyama, K., Oka, T. & Noto, K., 2011 Jun 1, In : IEEE Transactions on Applied Superconductivity. 21, 3 PART 2, p. 1657-1660 4 p., 5624613.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Experimental evaluation of the effect on AC loss of a polygonal arrangement in YBCO assembled conductors

Ogawa, J., Fukui, S., Oka, T., Sato, T., Ito, T., Sugisawa, J. & Tamura, A., 2011 Jun 1, In : IEEE Transactions on Applied Superconductivity. 21, 3 PART 3, p. 3285-3288 4 p., 5613958.

Research output: Contribution to journalArticle

5 Citations (Scopus)

Improvement of a magnetization method on a small-size superconducting bulk magnet system

Yokoyama, K., Oka, T. & Noto, K., 2011 Nov 1, In : Physica C: Superconductivity and its applications. 471, 21-22, p. 901-904 4 p.

Research output: Contribution to journalArticle

5 Citations (Scopus)