Tetsuo Oka

  • 1889 Citations
  • 22 h-Index
1990 …2019
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Research Output 1990 2019

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Accuracy of AC transport current loss in HTS tape measurements using a pick-up loop

Ogawa, J., Fukui, S., Oka, T., Sato, T., Maruko, A. & Tanaka, H., 2009 Jun 1, In : IEEE Transactions on Applied Superconductivity. 19, 3, p. 2391-2394 4 p., 5109567.

Research output: Contribution to journalArticle

Superconducting tapes
tapes
alternating current
Temperature
Critical currents
1 Citation (Scopus)

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

Superconducting cables
cables
alternating current
Magnetic fields
Temperature
10 Citations (Scopus)

A construction of high temperature superconducting motor using YBCO bulk magnets

Itoh, Y., Yanagi, Y., Yoshikawa, M., Oka, T., Harada, S., Sakakibara, T., Yamada, Y. & Mizutani, U., 1994 Jan 1, In : Physica C: Superconductivity and its applications. 235-240, PART 5, p. 3445-3446 2 p.

Research output: Contribution to journalArticle

Liquid nitrogen
liquid nitrogen
Magnets
magnets
YBCO superconductors
5 Citations (Scopus)

AC transport current loss characteristics of HTS assembled conductors arranged edge-to-edge or face-to-face

Ogawa, J., Fukui, S., Oka, T., Yamaguchi, M., Sato, T., Kume, S., Shinkai, K. & Sato, S., 2008 Jun 1, In : IEEE Transactions on Applied Superconductivity. 18, 2, p. 1353-1357 5 p., 4515899.

Research output: Contribution to journalArticle

Superconducting tapes
tapes
alternating current
conductors
Tapes

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

Magnets
proposals
Magnetization
magnets
Magnetic fields
26 Citations (Scopus)

Application of HTS bulk magnet system to the magnetic separation techniques for water purification

Oka, T., Kanayama, H., Fukui, S., Ogawa, J., Sato, T., Ooizumi, M., Terasawa, T., Itoh, Y. & Yabuno, R., 2008 Sep 15, In : Physica C: Superconductivity and its Applications. 468, 15-20, p. 2128-2132 5 p.

Research output: Contribution to journalArticle

Magnetic separation
water treatment
Purification
Magnets
magnets
1 Citation (Scopus)

A strong magnetic field generation by superconducting bulk magnets with the same pole arrangement

Yokoyama, K., Oka, T. & Noto, K., 2009 Jun 1, In : IEEE Transactions on Applied Superconductivity. 19, 3, p. 2178-2181 4 p., 5067189.

Research output: Contribution to journalArticle

Magnets
Poles
poles
magnets
Magnetic fields
11 Citations (Scopus)

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

Bearings (structural)
Magnetic separation
Electroless plating
plating
Sulfates
3 Citations (Scopus)

Compactly composed strong magnetic field generators with cryo-cooled high temperature bulk superconductors as quasi-permanent magnets

Oka, T., Hirose, Y., Kanayama, H., Kikuchi, H., Ogawa, J., Fukui, S., Sato, T. & Yamaguchi, M., 2008 Feb 1, In : Journal of Physics: Conference Series. 97, 1, 012102.

Research output: Contribution to journalArticle

permanent magnets
magnets
generators
magnetic fields
magnetic poles
1 Citation (Scopus)
Refrigerators
refrigerators
Magnets
Magnetization
magnets
1 Citation (Scopus)

Construction of a strong magnetic field generator with wide magnetic poles by bulk superconductors

Oka, T., Yokoyama, K. & Noto, K., 2004 Oct 1, In : Physica C: Superconductivity and its Applications. 412-414, SPEC. ISS., p. 761-765 5 p.

Research output: Contribution to journalArticle

magnetic poles
Superconducting materials
Magnets
Poles
magnets
12 Citations (Scopus)

Construction of strong magnetic field generators by high Tc bulk superconductors and its applications

Oka, T., Yokoyama, K. & Noto, K., 2004 Jun 1, In : IEEE Transactions on Applied Superconductivity. 14, 2, p. 1058-1061 4 p.

Research output: Contribution to journalArticle

magnetic poles
Superconducting materials
Poles
generators
Magnetic fields
2 Citations (Scopus)

Construction of superconducting bulk magnet magnetron sputtering apparatus for fabrication of highly reflective optical mirrors

Mizutani, U., Yamaguchi, T., Ikuta, H., Tomofuji, T., Yanagi, Y., Itoh, Y. & Oka, T., 2008 Jun 15, In : Materials Science and Engineering B: Solid-State Materials for Advanced Technology. 151, 1, p. 84-89 6 p.

Research output: Contribution to journalArticle

Multilayer films
Magnetron sputtering
Magnets
magnetron sputtering
magnets
8 Citations (Scopus)

Construction of various types of strong magnetic field generators using superconducting bulk magnets

Oka, T., Yokoyama, K. & Noto, K., 2005 Feb 1, In : Superconductor Science and Technology. 18, 2

Research output: Contribution to journalArticle

magnetic poles
Magnets
Poles
magnets
generators
67 Citations (Scopus)

Critical current density and mechanical strength of YBa2Cu3O7-δ superconducting composites containing Zr, Ag and Y2BaCuO5 dispersions by melt-processing

Oka, T., Itoh, Y., Yanagi, Y., Tanaka, H., Takashima, S., Yamada, Y. & Mizutani, U., 1992 Sep 15, In : Physica C: Superconductivity and its Applications. 200, 1-2, p. 55-64 10 p.

Research output: Contribution to journalArticle

Dispersions
Strength of materials
critical current
inclusions
current density
2 Citations (Scopus)

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

magnetic bearings
Magnetic bearings
spinners
central processing units
Masks
2 Citations (Scopus)

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

Magnetic levitation
levitation
metal spinning
central processing units
Masks
7 Citations (Scopus)

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

Refrigerators
refrigerators
Magnets
Magnetization
magnets
5 Citations (Scopus)

Development of a magnetron sputtering apparatus equipped with superconducting bulk magnets for the preparation of optical multilayer films

Yamaguchi, T., Ikuta, H., Yanagi, Y., Itoh, Y., Oka, T. & Mizutani, U., 2007 Oct 1, In : Physica C: Superconductivity and its Applications. 463-465, SUPPL., p. 1342-1345 4 p.

Research output: Contribution to journalArticle

Optical multilayers
Optical films
Multilayer films
Magnetron sputtering
Magnets
1 Citation (Scopus)

Development of a small-size superconducting bulk magnet system especially designed for a pulsed-field magnetization

Yokoyama, K., Oka, T. & Noto, K., 2009 Oct 15, In : Physica C: Superconductivity and its Applications. 469, 15-20, p. 1282-1285 4 p.

Research output: Contribution to journalArticle

Magnets
Magnetization
magnets
Refrigerators
magnetization
8 Citations (Scopus)

Development of a small-size superconducting bulk magnet system using a 13 K refrigerator

Yokoyama, K., Oka, T. & Noto, K., 2010 Jun 1, In : IEEE Transactions on Applied Superconductivity. 20, 3, p. 973-976 4 p., 5433295.

Research output: Contribution to journalArticle

Refrigerators
refrigerators
Magnets
magnets
Magnetic fields
63 Citations (Scopus)

Development of a superconducting magnet for nuclear magnetic resonance using bulk high-temperature superconducting materials

Nakamura, T., Itoh, Y., Yoshikawa, M., Oka, T. & Uzawa, J., 2007 Apr 1, In : Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering. 31, 2, p. 65-70 6 p.

Research output: Contribution to journalArticle

Superconducting magnets
superconducting magnets
Superconducting materials
Magnets
magnets
6 Citations (Scopus)

Development of five aligned superconducting bulk magnets by pulse field magnetizing

Fujiwara, A., Tateiwa, T., Fujishiro, H., Hayashi, H., Nagafuchi, T. & Oka, T., 2006 Oct 1, In : Physica C: Superconductivity and its Applications. 445-448, 1-2, p. 399-402 4 p.

Research output: Contribution to journalArticle

Magnets
magnets
Magnetic separation
Solenoids
coils
13 Citations (Scopus)

Effect of metal ring setting outside HTSC bulk disk on trapped field and temperature rise in pulse field magnetizing

Fujishiro, H., Yokoyama, K., Kaneyama, M., Oka, T. & Noto, K., 2005 Jun 1, In : IEEE Transactions on Applied Superconductivity. 15, 2 PART III, p. 3762-3765 4 p.

Research output: Contribution to journalArticle

high temperature superconductors
Metals
rings
pulses
metals
14 Citations (Scopus)

Effect of Nd422 addition on Jc in Nd123 melt-textured bulk superconductor

Ikeda, S., Oka, T., Yamada, Y., Yoshikawa, M., Yanagi, Y., Itoh, Y. & Mizutani, U., 1997 Jan 1, In : Japanese Journal of Applied Physics, Part 2: Letters. 36, 3 B

Research output: Contribution to journalArticle

Superconducting materials
Powders
Magnetic fields
atmospheres
heat
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

trapped magnetic fields
Magnets
magnetic flux
magnets
Magnetic fields
20 Citations (Scopus)

Estimation of generated heat in pulse field magnetizing for SmBaCuO bulk superconductor

Fujishiro, H., Yokoyama, K., Kaneyama, M., Oka, T. & Noto, K., 2004 Oct 1, In : Physica C: Superconductivity and its Applications. 412-414, SPEC. ISS., p. 646-650 5 p.

Research output: Contribution to journalArticle

Superconducting materials
heat
pulses
Specific heat
Temperature
1 Citation (Scopus)

Evaluation of current distribution in bulk superconductors magnetized by pulsed-fields

Yokoyama, K., Oka, T., Fujishiro, H. & Noto, K., 2007 Oct 1, In : Physica C: Superconductivity and its Applications. 463-465, SUPPL., p. 410-414 5 p.

Research output: Contribution to journalArticle

current distribution
Superconducting materials
Magnetization
Magnetic fields
evaluation
2 Citations (Scopus)

Evaluation of magnetic field distribution of superconducting bulk magnets with the same pole arrangement

Yokoyama, K., Oka, T. & Noto, K., 2008 Sep 15, In : Physica C: Superconductivity and its Applications. 468, 15-20, p. 2165-2169 5 p.

Research output: Contribution to journalArticle

Magnets
Poles
poles
magnets
Magnetic fields

Evaluation of magnetic force distribution on a pair of superconducting bulk magnets

Yokoyama, K., Oka, T. & Noto, K., 2010 Nov 1, In : Physica C: Superconductivity and its Applications. 470, 20, p. 1201-1206 6 p.

Research output: Contribution to journalArticle

force distribution
Magnets
magnets
Superconducting magnets
evaluation
3 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

Superconducting materials
Magnetization
magnetization
evaluation
Magnetic flux
5 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

Refrigerators
refrigerators
Magnets
Magnetization
magnets
1 Citation (Scopus)

Evaluation of the measurement of AC transport current loss in assembled HTS tapes using a pick-up loop

Ogawa, J., Fukui, S., Oka, T., Yamaguchi, M., Sato, T., Yamaya, K., Hamada, T. & Tanaka, H., 2007 Oct 1, In : Physica C: Superconductivity and its Applications. 463-465, SUPPL., p. 1159-1162 4 p.

Research output: Contribution to journalArticle

Tapes
tapes
alternating current
evaluation
Electric current measurement
4 Citations (Scopus)

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

Tapes
tapes
alternating current
Shielding
shielding
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

alternating current
conductors
evaluation
Tapes
tapes
2 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

Superconducting tapes
tapes
alternating current
Magnetic fields
magnetic fields
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

Tapes
tapes
alternating current
Iron
iron
7 Citations (Scopus)

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

alternating current
coils
direct current
Tapes
tapes
6 Citations (Scopus)

Fabrication of Mo/Si multilayer mirrors for extreme ultraviolet lithography by means of superconducting bulk magnet magnetron sputtering

Mizutani, U., Yamaguchi, T., Ikuta, H., Tomofuji, T., Yanagi, Y., Itoh, Y. & Oka, T., 2008 Sep 15, In : Physica C: Superconductivity and its Applications. 468, 15-20, p. 1456-1460 5 p.

Research output: Contribution to journalArticle

Extreme ultraviolet lithography
Magnetron sputtering
Magnets
Multilayer films
magnetron sputtering

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

Magnets
magnets
Chemical activation
activation
Magnetic fields
5 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

Magnetic flux
Magnets
Magnetization
magnets
Fluxes
13 Citations (Scopus)

Flux motion studies by means of temperature measurement in magnetizing processes for HTSC bulks

Fujishiro, H., Oka, T., Yokoyama, K., Kaneyama, M. & Noto, K., 2004 Jun 1, In : IEEE Transactions on Applied Superconductivity. 14, 2, p. 1054-1057 4 p.

Research output: Contribution to journalArticle

Temperature measurement
high temperature superconductors
temperature measurement
Fluxes
trapped magnetic fields
19 Citations (Scopus)

Generated heat during pulse field magnetizing for REBaCuO (RE = Gd, Sm, Y) bulk superconductors with different pinning abilities

Fujishiro, H., Kaneyama, M., Yokoyama, K., Oka, T. & Noto, K., 2005 Jan 1, In : Superconductor Science and Technology. 18, 1, p. 158-165 8 p.

Research output: Contribution to journalArticle

Magnetic flux
Superconducting materials
heat
Heat generation
Viscous flow
15 Citations (Scopus)

Generation of extremely strong magnetic fields in open space by using metal-ring-reinforced 60 mm ∅ Sm-Ba-Cu-O superconducting bulk

Yanagi, Y., Yoshikawa, M., Itoh, Y., Oka, T., Ikuta, H. & Mizutani, U., 2004 Oct 1, In : Physica C: Superconductivity and its Applications. 412-414, SPEC. ISS., p. 744-749 6 p.

Research output: Contribution to journalArticle

Superconducting materials
Metals
Stainless Steel
Magnetic fields
reinforcement rings
8 Citations (Scopus)

Heat propagation analysis in HTSC bulks during pulse field magnetization

Fujishiro, H., Kawaguchi, S., Kaneyama, M., Fujiwara, A., Tateiwa, T. & Oka, T., 2006 Jul 1, In : Superconductor Science and Technology. 19, 7

Research output: Contribution to journalArticle

high temperature superconductors
Magnetization
heat
magnetization
propagation
129 Citations (Scopus)

Higher trapped field over 5 T on HTSC bulk by modified pulse field magnetizing

Fujishiro, H., Tateiwa, T., Fujiwara, A., Oka, T. & Hayashi, H., 2006 Oct 1, In : Physica C: Superconductivity and its Applications. 445-448, 1-2, p. 334-338 5 p.

Research output: Contribution to journalArticle

high temperature superconductors
Superconducting materials
Magnetic fields
Cooling
pulses
65 Citations (Scopus)

High-temperature superconducting motor using y-ba-cu-0 bulk magnets

Itoh, Y., Yanagi, Y., Yoshikawa, M., Oka, T., Harada, S., Sakakibara, T., Yamada, Y. & Mizutani, U., 1995 Jan 1, In : Japanese Journal of Applied Physics. 34, 10, p. 5574-5578 5 p.

Research output: Contribution to journalArticle

Magnets
magnets
YBCO superconductors
armatures
magnetic fields
3 Citations (Scopus)

High temperature superconducting quasi-permanent magnets and their application to superconducting motor

Oka, T., Itoh, Y., Yanagi, Y., Yoshikawa, M., Sakakibara, T., Harada, S., Yamada, Y. & Mizutani, U., 1997 Jan 1, In : Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals. 61, 9, p. 931-936 6 p.

Research output: Contribution to journalArticle

high field magnets
Superconducting magnets
permanent magnets
Permanent magnets
Magnetization
20 Citations (Scopus)

Importance of initial "M-shaped" trapped field profile in a two-stage pulse field magnetization (MMPSC) method

Fujishiro, H., Hiyama, T., Tateiwa, T., Yanagi, Y. & Oka, T., 2007 Oct 1, In : Physica C: Superconductivity and its Applications. 463-465, SUPPL., p. 394-397 4 p.

Research output: Contribution to journalArticle

Magnetization
Fluxes
Cooling
cooling
magnetization
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

Magnets
Magnetization
magnets
Magnetic flux
magnetization