Tetsuo Oka

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

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Article
2011
1 Citation (Scopus)

Magnetic separation technique for groundwater by five HTS melt-processed bulk magnets arranged in a line

Oka, T., Seki, H., Kimura, T., Mimura, D., Fukui, S., Ogawa, J., Sato, T., Ooizumi, M., Fujishiro, H., Hayashi, H., Yokoyama, K. & Stiehler, C., 2011 Nov 1, In : Physica C: Superconductivity and its Applications. 471, 21-22, p. 1506-1510 5 p.

Research output: Contribution to journalArticle

Magnetic separation
ground water
magnetic poles
Magnets
Groundwater
13 Citations (Scopus)

Performance of trapped magnetic field in superconducting bulk magnets activated by pulsed field magnetization

Oka, T., Seki, H., Ogawa, J., Fukui, S., Sato, T. & Yokoyama, K., 2011 Jun 1, In : IEEE Transactions on Applied Superconductivity. 21, 3 PART 3, p. 3356-3359 4 p., 5658131.

Research output: Contribution to journalArticle

trapped magnetic fields
Magnets
Magnetization
magnets
Magnetic fields
1 Citation (Scopus)

Prototype of SC inverter

Osamura, K., Sakai, A., Nakamura, T., Oka, T., Fukuda, S. & Yamaguchi, S., 2011 Jun 1, In : IEEE Transactions on Applied Superconductivity. 21, 3 PART 2, p. 1445-1448 4 p., 5675739.

Research output: Contribution to journalArticle

prototypes
alternating current
Io
Critical currents
critical current
2010
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

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
15 Citations (Scopus)

Influence of transport current distribution on AC transport current loss measurement in an assembled conductor

Ogawa, J., Fukui, S., Oka, T., Sato, T., Shinkai, K., Koyama, T. & Ito, T., 2010 Jun 1, In : IEEE Transactions on Applied Superconductivity. 20, 3, p. 1300-1303 4 p., 5433294.

Research output: Contribution to journalArticle

current distribution
alternating current
conductors
Superconducting tapes
Electric current measurement
9 Citations (Scopus)

Magnetic separation technique for environmental water purification by strong magnetic field generator loading HTS bulk magnets

Oka, T., Tanaka, K., Kimura, T., Mimura, D., Fukui, S., Ogawa, J., Sato, T., Ooizumi, M., Yokoyama, K. & Yamaguchi, M., 2010 Nov 1, In : Physica C: Superconductivity and its Applications. 470, 20, p. 1799-1803 5 p.

Research output: Contribution to journalArticle

Magnetic separation
water treatment
Ferrosoferric Oxide
Purification
Magnets
5 Citations (Scopus)

Numerical analysis of relation between AC loss characteristics and geometrical parameters of multi-layer polygonal conductor assembled by HTS coated conductor

Fukui, S., Suzuki, N., Ogawa, J., Oka, T., Sato, T. & Tsukamoto, O., 2010 Jun 1, In : IEEE Transactions on Applied Superconductivity. 20, 3, p. 2138-2141 4 p., 5443668.

Research output: Contribution to journalArticle

Tapes
tapes
numerical analysis
Numerical analysis
alternating current
1 Citation (Scopus)

Numerical study on AC loss reduction of multi-pole HTS coil by optimal design of winding cross section of element coil

Fukui, S., Takahashi, M., Ogawa, J., Oka, T., Sato, T., Yamaguchi, M. & Takao, T., 2010 Jun 1, In : IEEE Transactions on Applied Superconductivity. 20, 3, p. 2150-2154 5 p., 5451072.

Research output: Contribution to journalArticle

Poles
alternating current
poles
coils
cross sections
3 Citations (Scopus)

Research and development of non-contact spin processor for clean process in semiconductor-related-production system by applying HTS magnetic levitation

Fukui, S., Kazama, K., Sekiya, S., Ogawa, J., Oka, T., Sato, T., Sorimachi, S., Saito, K. & Miyazaki, S., 2010 Jun 1, In : IEEE Transactions on Applied Superconductivity. 20, 3, p. 977-980 4 p., 5433322.

Research output: Contribution to journalArticle

Magnetic levitation
levitation
research and development
central processing units
Masks
2009

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)

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
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
19 Citations (Scopus)

Numerical analysis of AC loss characteristics of multi-layer HTS cable assembled by coated conductors

Fukui, S., Ogawa, J., Suzuki, N., Oka, T., Sato, T., Tsukamoto, O. & Takao, T., 2009 Jun 1, In : IEEE Transactions on Applied Superconductivity. 19, 3, p. 1714-1717 4 p., 4982598.

Research output: Contribution to journalArticle

Tapes
cables
tapes
numerical analysis
Numerical analysis
3 Citations (Scopus)

Study of flow fractionation characteristics of magnetic chromatography utilizing high-temperature superconducting bulk magnet

Fukui, S., Shoji, Y., Ogawa, J., Oka, T., Yamaguchi, M., Sato, T., Ooizumi, M., Imaizumi, H. & Ohara, T., 2009 Mar 1, In : Science and Technology of Advanced Materials. 10, 1, 014610.

Research output: Contribution to journalArticle

Fractionation
Chromatography
Magnetic susceptibility
Magnets
Flow velocity
6 Citations (Scopus)

Study on magnetic separation system using high Tc superconducting bulk magnets for water purification technique

Oka, T., Kanayama, H., Tanaka, K., Fukui, S., Ogawa, J., Sato, T., Yamaguchi, M., Ooizumi, M., Yokoyama, K. & Noto, K., 2009 Jan 1, In : Journal of Physics: Conference Series. 156, 012031.

Research output: Contribution to journalArticle

water treatment
magnets
gradients
solenoids
waste water
10 Citations (Scopus)

Thermal and magnetic behaviors of a melt-textured superconducting bulk magnet in the zero-field-cooling magnetizing process

Oka, T., Yokoyama, K., Fujishiro, H. & Noto, K., 2009 Aug 11, In : Superconductor Science and Technology. 22, 6, 065014.

Research output: Contribution to journalArticle

Magnets
magnetic flux
magnets
Magnetic flux
heat generation
2 Citations (Scopus)

Thermal behavior and field-trapping property of melt-textured superconducting bulk magnets activated by quasi-static magnetic fields

Oka, T., Yokoyama, K., Fujishiro, H. & Noto, K., 2009 Jan 1, In : Journal of Physics: Conference Series. 150, 5, 052195.

Research output: Contribution to journalArticle

magnets
trapping
trapped magnetic fields
cooling
heat generation
8 Citations (Scopus)

Waste water purification by magnetic separation technique using HTS bulk magnet system

Oka, T., Kanayama, H., Tanaka, K., Fukui, S., Ogawa, J., Sato, T., Ooizumi, M., Terasawa, T., Itoh, Y. & Yabuno, R., 2009 Oct 15, In : Physica C: Superconductivity and its Applications. 469, 15-20, p. 1849-1852 4 p.

Research output: Contribution to journalArticle

waste water
Magnetic separation
water treatment
Purification
Magnets
2008
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
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
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
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
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
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

Numerical analysis of AC transport current loss measurements using a pick-up loop

Ogawa, J., Fukui, S., Oka, T., Yamaguchi, M., Sato, T., Hamada, T. & Tanaka, H., 2008 Jun 1, In : IEEE Transactions on Applied Superconductivity. 18, 2, p. 1358-1361 4 p., 4515900.

Research output: Contribution to journalArticle

Superconducting tapes
tapes
numerical analysis
Numerical analysis
alternating current
3 Citations (Scopus)

Numerical analysis of bulk superconducting magnet magnetized by pulsed-field considering a partial difference of superconducting characteristics

Yokoyama, K., Oka, T., Fujishiro, H. & Noto, K., 2008 Jun 1, In : IEEE Transactions on Applied Superconductivity. 18, 2, p. 1545-1548 4 p., 4512029.

Research output: Contribution to journalArticle

Superconducting magnets
superconducting magnets
numerical analysis
Numerical analysis
Magnetic fields
5 Citations (Scopus)

Reflective properties of Mo/Si multilayer for EUV lithography deposited by the magnetron sputtering device with superconducting bulk magnets

Yamaguchi, T., Ikuta, H., Tomofuji, T., Yanagi, Y., Itoh, Y., Oka, T. & Mizutani, U., 2008 Sep 15, In : Physica C: Superconductivity and its Applications. 468, 15-20, p. 2170-2173 4 p.

Research output: Contribution to journalArticle

Extreme ultraviolet lithography
Multilayer films
Magnetron sputtering
Magnets
magnetron sputtering
6 Citations (Scopus)

Study on optimal design of high temperature superconducting coil based on AC loss minimization

Fukui, S., Ohsugi, K., Nishijyo, T., Ogawa, J., Oka, T., Yamaguchi, M., Sato, T., Furuse, M., Takao, T. & Tsukamoto, O., 2008 Jun 1, In : IEEE Transactions on Applied Superconductivity. 18, 2, p. 1366-1369 4 p., 4510854.

Research output: Contribution to journalArticle

alternating current
coils
optimization
cross sections
Temperature
3 Citations (Scopus)

Study on performance improvements of a high-temperature superconducting coil with a lattice-shape cross section

Ishiguri, S., Oka, T., Fukui, S., Ogawa, J. & Sato, T., 2008 Jul 15, In : Physica C: Superconductivity and its Applications. 468, 14, p. 1028-1031 4 p.

Research output: Contribution to journalArticle

Superconducting tapes
coils
Critical currents
cross sections
tapes
3 Citations (Scopus)

Study on the performance improvement of the high temperature superconducting coil with several separated coils at the edges

Ishiguri, S., Oka, T., Fukui, S., Ogawa, J. & Sato, T., 2008 Sep 15, In : Physica C: Superconductivity and its Applications. 468, 15-20, p. 2152-2155 4 p.

Research output: Contribution to journalArticle

Critical currents
coils
Tapes
Magnetic fields
Superconducting tapes
2007
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
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
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
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
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
6 Citations (Scopus)

Influence of high frequency AC magnetic field on trapped magnetic field

Ogawa, J., Fukui, S., Oka, T., Yamaguchi, M., Sato, T., Takada, M., Sato, R. & Tomita, M., 2007 Jun 1, In : IEEE Transactions on Applied Superconductivity. 17, 2, p. 3024-3027 4 p.

Research output: Contribution to journalArticle

trapped magnetic fields
alternating current
Magnetic fields
magnetic fields
equilibrium equations
10 Citations (Scopus)

Performances of compact magnetic field generators using cryo-cooled high temperature bulk superconductors as quasi-permanent magnets

Oka, T., Hirose, Y., Kanayama, H., Kikuchi, H., Fukui, S., Ogawa, J., Sato, T. & Yamaguchi, M., 2007 Dec 1, In : Superconductor Science and Technology. 20, 12, p. 1233-1238 6 p.

Research output: Contribution to journalArticle

permanent magnets
Permanent magnets
Superconducting materials
Magnets
magnets
34 Citations (Scopus)

Processing and applications of bulk HTSC

Oka, T., 2007 Oct 1, In : Physica C: Superconductivity and its Applications. 463-465, SUPPL., p. 7-13 7 p.

Research output: Contribution to journalArticle

high temperature superconductors
Nuclear magnetic resonance
Magnetic separation
nuclear magnetic resonance
Refrigerators
5 Citations (Scopus)

Study on application of magnetic levitation utilizing HTS bulks to spin processors for photo mask production

Fukui, S., Sato, R., Ogawa, J., Oka, T., Yamaguchi, M., Sato, T., Miyazaki, S., Sasahara, T., Tamaki, T., Nishiwaki, S. & Yuki, Y., 2007 Oct 1, In : Physica C: Superconductivity and its Applications. 463-465, SUPPL., p. 1289-1292 4 p.

Research output: Contribution to journalArticle

Magnetic levitation
levitation
central processing units
Masks
masks
4 Citations (Scopus)

Study on optimization design of superconducting magnet for magnetic force assisted drug delivery system

Fukui, S., Abe, R., Ogawa, J., Oka, T., Yamaguchi, M., Sato, T. & Imaizumi, H., 2007 Oct 1, In : Physica C: Superconductivity and its Applications. 463-465, SUPPL., p. 1315-1318 4 p.

Research output: Contribution to journalArticle

Superconducting magnets
design optimization
superconducting magnets
delivery
drugs
8 Citations (Scopus)

Temperature rise in melt-textured large grain superconducting bulk magnets during their magnetizing operations

Oka, T., Yokoyama, K., Fujishiro, H. & Noto, K., 2007 Sep 1, In : Physica C: Superconductivity and its Applications. 460-462 II, SPEC. ISS., p. 748-749 2 p.

Research output: Contribution to journalArticle

Magnets
magnets
Cooling
cooling
heat generation
8 Citations (Scopus)

Trapped field and temperature rise in rectangular-shaped HTSC bulk magnetized by pulse fields

Tateiwa, T., Sazuka, Y., Fujishiro, H., Hayashi, H., Nagafuchi, T. & Oka, T., 2007 Oct 1, In : Physica C: Superconductivity and its Applications. 463-465, SUPPL., p. 398-401 4 p.

Research output: Contribution to journalArticle

Heat generation
high temperature superconductors
heat generation
Flux pinning
Magnetic flux
2006
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
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
8 Citations (Scopus)

New type superconducting bulk magnet by pulse field magnetizing with usable surface on both sides in open space

Fujishiro, H., Fujiwara, A., Tateiwa, T., Oka, T. & Hayashi, H., 2006 Jun 1, In : IEEE Transactions on Applied Superconductivity. 16, 2, p. 1080-1083 4 p., 1643036.

Research output: Contribution to journalArticle

Magnets
magnets
coils
pulses
Solenoids
5 Citations (Scopus)

Trapped field over 4 tesla on GdBaCuO bulk by pulse field method and magnetizing mechanism

Fujishiro, H., Kaneyama, M., Tateiwa, T. & Oka, T., 2006 Jun 1, In : Journal of Physics: Conference Series. 43, 1, p. 405-408 4 p., 101.

Research output: Contribution to journalArticle

pulses
magnetic flux
cooling
temperature
2005
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
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