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Article
1996

Static and dynamic response of a parallel-module high power-factor converters system with current-balancing controllers

Kohama, T., Ninomiya, T., Wakamatsu, M. & Shoyama, M., 1996, In : Unknown Journal. 2, p. 1198-1203 6 p.

Research output: Contribution to journalArticle

6 Citations (Scopus)
1995

Development of high-field a.c. superconducting magnet using ultrafine multifilamentary Nb-Ti superconducting wire with designed Nb artificial pins

Miura, O., Inoue, I., Suzuki, T., Matsumoto, K., Tanaka, Y., Funaki, K., Iwakuma, M., Yamafuji, K. & Matsushita, T., 1995, In : Cryogenics. 35, 3, p. 181-188 8 p.

Research output: Contribution to journalArticle

7 Citations (Scopus)

Development of high Jc Nb-Ti multifilamentary superconducting wires for a.c. use by artificially introduced pins

Miura, O., lnoue, I., Suzuki, T., Matsumoto, K., Tanaka, Y., Funaki, K., Iwakuma, M., Yamafuji, K. & Matsushita, T., 1995, In : Cryogenics. 35, 3, p. 169-180 12 p.

Research output: Contribution to journalArticle

9 Citations (Scopus)

Experimental Evaluation of AC Losses in Superconducting Multifilamentary Wires for 50/60 Hz Use Exposed to a Magnetic Field with Arbitrary Angle with the Wire Axis

Kanetaka, H., Ueda, H., Eguchi, Y., Iwakuma, M., Funaki, K., Takeo, M., Yamafuji, K., Kumano, T., Ichihara, M. & Miyake, S., Jun 1995, In : IEEE Transactions on Applied Superconductivity. 5, 2, p. 737-740 4 p.

Research output: Contribution to journalArticle

3 Citations (Scopus)

Experimental evaluation of longitudinal field loss in multiply-twisted superconducting cables for a.c. use

Kanetaka, H., Ueda, H., Eguchi, Y., Iwakuma, M., Funaki, K., Takeo, M., Yamafuji, K., Miyake, S., Kumano, T. & Ichihara, M., May 1995, In : Cryogenics. 35, 5, p. 327-333 7 p.

Research output: Contribution to journalArticle

2 Citations (Scopus)

Simulation test and theoretical analysis of surge propagation in superconducting magnet

Choi, B. J., Ohtsuka, S., Suehiro, J. & Hara, M., Aug 1995, In : Cryogenics. 35, 8, p. 505-513 9 p.

Research output: Contribution to journalArticle

2 Citations (Scopus)
1994

Enhanced Jc properties in superconducting NbTi composites by introducing Nb artificial pins with a layered structure

Matsumoto, K., Takewaki, H., Tanaka, Y., Miura, O., Yamafuji, K., Funaki, K., Iwakuma, M. & Matsushita, T., Dec 1 1994, In : Applied Physics Letters. 64, 1, p. 115-117 3 p.

Research output: Contribution to journalArticle

36 Citations (Scopus)

Frequency dependences of Ac losses in (Bi1-xPbx)2Sr2Ca2Cu3Oy bulk superconductors in Ac magnetic field

Iwakuma, M., Konomi, H., Funaki, K., Takeo, M., Kuroda, K., Tanaka, Y., Mimura, M., Takita, K., Hiue, H. & Yamafuji, K., 1994, In : Cryogenics. 34, SUPPL. 1, p. 793-796 4 p.

Research output: Contribution to journalArticle

8 Citations (Scopus)

Pulsed electrical breakdown in liquid helium in the μs range

Suehiro, J., Yamasaki, K., Matsuo, H., Hara, M. & Gerhold, J., Jun 1994, In : IEEE Transactions on Dielectrics and Electrical Insulation. 1, 3, p. 403-406 4 p.

Research output: Contribution to journalArticle

6 Citations (Scopus)
1993

Sweep-rate dependences of losses in aluminum-stabilized superconducting conductors for the Large Helical Device

Sumiyoshi, F., Kanai, Y., Kawashima, T., Iwakuma, M., Mito, T., Takahata, K., Yanagi, N. & Yamamoto, J., Jan 1993, In : Fusion Engineering and Design. 20, C, p. 371-376 6 p.

Research output: Contribution to journalArticle

9 Citations (Scopus)

The development of a 2.5 T/100 kV a AC superconducting magnet using a high-Jc NbTi superconducting wire having Nb artificial pins

Miura, O., Inoue, I., Suzuki, T., Matsumoto, K., Tanaka, Y., Funaki, K., Iwakuma, M., Yamafuji, K. & Matsushita, T., Dec 1 1993, In : Superconductor Science and Technology. 6, 10, p. 748-754 7 p., 008.

Research output: Contribution to journalArticle

1 Citation (Scopus)

Theoretical evaluation of longitudinal a.c. losses in large-capacity superconducting cables for 50 60 Hz use

Funaki, K., Ueda, H., Yoshlya, F., Iwakuma, M., Takeo, M. & Yamafuji, K., Jan 1 1993, In : Cryogenics. 33, 2, p. 190-198 9 p.

Research output: Contribution to journalArticle

12 Citations (Scopus)

Zero-voltage-switching realized by magnetizing current of transformer in push-pull current-fed DC-DC converter

Shoyama, M. & Harada, K., 1993, In : Unknown Journal. p. 178-184 7 p.

Research output: Contribution to journalArticle

10 Citations (Scopus)
1992

Deflection of Streamer Channels in High Magnetic Field

Hara, M., Suehiro, J. & Wakiyama, T., Dec 1992, In : IEEE Transactions on Electrical Insulation. 27, 6, p. 1179-1185 7 p.

Research output: Contribution to journalArticle

4 Citations (Scopus)

Development of a Large-Capacity Superconducting Cable for 1000 KV A-Class Power Transformers

Funaki, K., Iwakuma, M., Satoh, S., Hiramatsu, M., Takeo, M., Yamafuji, K., Nonaka, S., Hoshino, M., Simada, M., Yoneda, E. S., Sasaki, T., Fujioka, T., Kumano, T. & Suzuki, E., Jan 1 1992, In : IEEE Transactions on Magnetics. 28, 1, p. 394-397 4 p.

Research output: Contribution to journalArticle

12 Citations (Scopus)

Losses of Aluminum-Stabilized Superconducting Conductors for Large Helical Device

Sumiyoshi, F., Kanai, Y., Kawashima, T., Iwakuma, M., Mito, T., Takahata, K., Yanagi, N. & Yamamoto, J., Jan 1 1992, In : IEEE Transactions on Magnetics. 28, 1, p. 210-213 4 p.

Research output: Contribution to journalArticle

8 Citations (Scopus)

Pinning characteristics in multifilamentary NbTi superconducting wires with submicrometre filaments introduced artificial pinning centres

Miura, O., Matsumoto, K., Tanaka, Y., Yamafuji, K., Harada, N., Iwakuma, M., Funaki, K. & Matsushita, T., 1992, In : Cryogenics. 32, 3, p. 315-322 8 p.

Research output: Contribution to journalArticle

16 Citations (Scopus)
1991

Instability in kiloamp class a.c. superconducting cables

Funaki, K., Nakashima, M., Iwakuma, M., Takeo, M. & Yamafuji, K., Jul 1991, In : Cryogenics. 31, 7, p. 594-597 4 p.

Research output: Contribution to journalArticle

17 Citations (Scopus)

Mobilities of charge carriers generated by corona discharge in low temperature helium gas

Suehiro, J., Yamamoto, K. & Hara, M., Aug 14 1991, In : Journal of Physics D: Applied Physics. 24, 8, p. 1360-1366 7 p.

Research output: Contribution to journalArticle

1 Citation (Scopus)

Quench Protection of Superconducting Transformers

Iwakuma, M., Funaki, K., Takeo, M. & Yamafuji, K., Mar 1991, In : IEEE Transactions on Magnetics. 27, 2, p. 2080-2083 4 p.

Research output: Contribution to journalArticle

4 Citations (Scopus)
1990

Abnormal quench process with very fast elongation of normal zone in multi-strand superconducting cables

Iwakuma, M., Kanetaka, H., Tasaki, K., Funaki, K., Takeo, M. & Yamafuji, K., Aug 1990, In : Cryogenics. 30, 8, p. 686-692 7 p.

Research output: Contribution to journalArticle

43 Citations (Scopus)

Breakdown characteristics of cryogenic gaseous helium in uniform electric field and space charge modified non-uniform field

Hara, M., Suehiro, J. & Matsumoto, H., Jan 1 1990, In : Cryogenics. 30, 9, p. 787-794 8 p.

Research output: Contribution to journalArticle

6 Citations (Scopus)

Methods for the improvement of electrical insulation in vacuum in the presence of transverse magnetic field

Hara, M., Suehiro, J., Shigematsu, H. & Yano, S., Jan 1 1990, In : Electrical Engineering in Japan. 110, 2, p. 27-35 9 p.

Research output: Contribution to journalArticle

1 Citation (Scopus)
1989

Breakdown Characteristics of Cryogenic Gaseous Nitrogen and Estimation of its Electrical Insulation Properties

Hara, M., Suehiro, J., Matsumoto, H. & Kaneko, T., Aug 1989, In : IEEE Transactions on Electrical Insulation. 24, 4, p. 609-617 9 p.

Research output: Contribution to journalArticle

22 Citations (Scopus)

Increase in coupling-current losses of superconducting cables due to first-stage cabling Part 2: optimum structure of solder-impregnated sub-cable with normal-metal strands

Funaki, K., Ichimaru, O., Iwakuma, M., Sumiyoshi, F., Miyahara, K. & Yamafuji, K., Apr 1989, In : Cryogenics. 29, 4, p. 423-428 6 p.

Research output: Contribution to journalArticle

1 Citation (Scopus)

Methods for the improvement of electrical insulation in vacuum in the presence of transverse magnetic field

Hara, M., Suehiro, J., Shigematsu, H. & Yano, S., Jan 1 1989, In : IEEJ Transactions on Fundamentals and Materials. 109, 9, p. 375-382 8 p.

Research output: Contribution to journalArticle

Quench analysis in a 72 kVA superconducting four-winding power transformer

Iwakuma, M., Funaki, K., Kanetaka, H., Tasaki, K., Takeo, M. & Yamafuji, K., Nov 1989, In : Cryogenics. 29, 11, p. 1055-1062 8 p.

Research output: Contribution to journalArticle

10 Citations (Scopus)
1988

Ac inductive measurement of intergrain and intragrain currents in high-tc oxide superconductors

Ni, B., Munakata, T., Matsushita, T., Iwakuma, M., Funaki, K., Takeo, M. & Yamafuji, K., Sep 1988, In : Japanese Journal of Applied Physics. 27, 9 R, p. 1658-1662 5 p.

Research output: Contribution to journalArticle

48 Citations (Scopus)

Critical transport current density in sintered oxide superconductors with high critical temperature

Matsushita, T., Ni, B., Sudo, Y., Iwakuma, M., Funaki, K., Takeo, M. & Yamafuji, K., Jun 1988, In : Japanese Journal of Applied Physics. 27, 6R, p. 929-936 8 p.

Research output: Contribution to journalArticle

23 Citations (Scopus)

Phase-Controlled DC-AC Converter with High-Frequency Switching

Harada, K., Sakamoto, H. & Shoyama, M., Oct 1988, In : IEEE Transactions on Power Electronics. 3, 4, p. 406-411 6 p.

Research output: Contribution to journalArticle

45 Citations (Scopus)
1987

17 TESLA SUPERCONDUCTING MAGNET WITH MULTIFILAMENTARY SUPERCONDUCTORS.

Takeo, M., Funaki, K., Sato, S., Yamafuji, K., Iwakuma, M., Hiramatsu, M., Matsumoto, K. & Hamada, M., Jan 1 1987, In : IEEE Transactions on Magnetics. MAG-23, 2

Research output: Contribution to journalArticle

A superconducting sub-structure in sintered ybacu3o7-x plates

Funaki, K., Iwakuma, M., Sudo, Y., Ni, B., Kisu, T., Matsushita, T., Takeo, M. & Yamafuji, K., Sep 1987, In : Japanese Journal of Applied Physics. 26, 9A, p. 1445-1447 3 p.

Research output: Contribution to journalArticle

29 Citations (Scopus)

Development of Nb3Sn superconducting wires for AC use

Yamafuji, K., Iwakuma, M., Tomita, Y. & Funaki, K., Jan 1 1987, In : IEEE Transactions on Magnetics. 23, 2, p. 1355-1358 4 p.

Research output: Contribution to journalArticle

4 Citations (Scopus)

DEVELOPMENT OF Nb3Sn SUPERCONDUCTING WIRES FOR AC USE.

Yamafuji, K., Iwakuma, M., Tomita, Y., Funaki, K., Sumiyoshi, F., Fukutsuka, T., Ogawa, R., Miyatake, T. & Matsumoto, K., Jan 1 1987, In : IEEE Transactions on Magnetics. MAG-23, 2

Research output: Contribution to journalArticle

Estimate of attainable critical current density in superconducting yba2cu3o7-ै

Matsushita, T., Iwakuma, M., Sudo, Y., Ni, B., Kisu, T., Funaki, K., Takeo, M. & Yamafuji, K., Sep 1987, In : Japanese Journal of Applied Physics. 26, 9A, p. 1524-1526 3 p.

Research output: Contribution to journalArticle

38 Citations (Scopus)

On the Effective Turn-Off of GTO by a Small Saturable Core

Harada, K., Sakamoto, H. & Shoyama, M., Jan 1 1987, In : IEEE Transactions on Power Electronics. PE-2, 1, p. 20-27 8 p.

Research output: Contribution to journalArticle

2 Citations (Scopus)
1986

Anomalous magnetic behavior due to reversible fluxoid motion in superconducting multifilamentary wires with very fine filaments

Sumiyoshi, F., Matsuyama, M., Noda, M., Matsushita, T., Funaki, K., Iwakuma, M. & Yamafuji, K., Feb 1986, In : Japanese Journal of Applied Physics. 25, 2 A, p. L148-L150

Research output: Contribution to journalArticle

38 Citations (Scopus)

Dynamic characteristics of the push‐pull dc‐dc converter

Shoyama, M. & Harada, K., Jan 1 1986, In : Electronics and Communications in Japan (Part II: Electronics). 69, 5, p. 100-109 10 p.

Research output: Contribution to journalArticle

Dynamic Characterstics of the Push-Pull DC to DC Converter

Shoyama, M. & Harada, K., Jan 1986, In : IEEE Transactions on Power Electronics. PE-1, 1, p. 3-8 6 p.

Research output: Contribution to journalArticle

3 Citations (Scopus)

Effects of tin-diffusion barriers on hysteresis loss and coupling current loss in bronze-processed Nb3Sn multifilamentary composites

Miyahara, K., Sumiyoshi, F., Funaki, K., Iwakuma, M., Kubota, Y., Ogasawara, T. & Yamafuji, K., Apr 1986, In : Cryogenics. 26, 4, p. 234-241 8 p.

Research output: Contribution to journalArticle

8 Citations (Scopus)

On the High-Speed Turn-Off of a Power Transistor By a Small Saturable Core

Harada, K., Sakamoto, H. & Shoyama, M., Jul 1986, In : IEEE Transactions on Power Electronics. PE-1, 3, p. 175-180 6 p.

Research output: Contribution to journalArticle

10 Citations (Scopus)
1985

On the turn-off of GTO by a small saturable core

Harada, K., Sakamoto, H. & Shoyama, M., Jan 1 1985, In : IEEJ Transactions on Electronics, Information and Systems. 105, 11, p. 219-226 8 p.

Research output: Contribution to journalArticle

1984

A practical in situ wire: a composite wire with many in situ processed Nb3Sn cores of an internal diffusion type

Yamafuji, K., Sumiyoshi, F., Akenaga, Y., Iwakuma, M., Onodera, R. & Mori, N., Apr 1984, In : Cryogenics. 24, 4, p. 191-199 9 p.

Research output: Contribution to journalArticle

1 Citation (Scopus)

Steady-State Characteristics of the Push-Pull DC-to-DC Converter

Shoyama, M. & Harada, K., 1984, In : IEEE Transactions on Aerospace and Electronic Systems. AES-20, 1, p. 50-56 7 p.

Research output: Contribution to journalArticle

7 Citations (Scopus)
1983

Megahertz dc-to-dc converters controlled by an amorphous core

Harada, K., Sakamoto, H., Sasada, I. & Shoyama, M., Sep 1983, In : IEEE Transactions on Magnetics. 19, 5, p. 2082-2084 3 p.

Research output: Contribution to journalArticle

2 Citations (Scopus)