Faculty Profiles - OGAWA Jun

MISC - OGAWA Jun

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Selective Magnetic Separation Using Narrow Channel Placed in Quadrupole Magnetic Field

FUKUI S., TAKAHASHI M., YAMAGUCHI M., OGAWA J., SATO T., IMAIZUMI H., OIZUMI M., OHARA T., WATANABE T., NISHIJIMA S.

72 111 - 111 2005.5

AC loss characteristics of superconducting strip due to critical current density distribution

OGAWA Jun, FUKUI Satoshi, YAMAGUCHI Mitsugi, SATO Takao, YOSHIDA Toshihide, TSUKAMOTO Osami

2005 ( 13 ) 7 - 11 2005.1

様々な断面形状の高温超伝導コイルの交流損失特性の理論解析

阿部正一, 西條威, 小川純, 福井聡, 山口貢, 佐藤孝雄, 古瀬充穂, 田中秀樹, 新井和昭, 梅田政一

電気学会研究会資料. ASC, 超電導応用電力機器 2005 ( 1 ) 35 - 40 2005.1

AC transport current losses in YBCO tapes in an assembled conductor

NAKAMURA Satoshi, OGAWA Daichi, TSUKAMOTO Osami, OGAWA Jun

2005 ( 1 ) 41 - 46 2005.1

Transport current loss characteristics of HoBaCuO-123 coated conductors with a ferromagnetic substrate subject to DC magnetic field

NAKAYAMA H., ODAKA S., UCHIDA S., TSUKAMOTO O., MIYAGI D., OGAWA J., HAHAKURA S., UEYAMA M., OHMATSU K.

2005 ( 1 ) 47 - 51 2005.1

高温超伝導線材を用いた円形集合導体の交流通電損失の非接触測定法の理論的検討

小島龍一, 渡辺壮, 小川純, 福井聡, 山口貢, 佐藤孝雄, 塚本修巳

低温工学・超電導学会講演概要集 73rd 2005

AC loss characteristics of HTS tapes subject to bending

SUZUKI Hiroyuki, CISZEK M., TSUKAMOTO Osami, OGAWA Jun

71 130 - 130 2004.11

Measurement of AC loss in HTS tape by double saddle shape pick-up coil

OGAWA Jun, FUKUI Satoshi, YAMAGUCHI Mitsugi, KOBAYASHI Yoichi, ONODERA Mitsuru

71 193 - 193 2004.11

AC loss characteristics of YBCO coated conductors with Ag protection layer

J Ogawa, H Nakayama, S Odaka, O Tsukamoto

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 412 ( 2 ) 1021 - 1025 2004.10

Language：English Publisher：ELSEVIER SCIENCE BV

We measured AC transport current and magnetization losses in two samples of YBCO coated conductors with thin (10 mum) and thick (50 mum) Ag protection layers to investigate the influence of the Ag layer on the AC losses. The experiments showed that the Ag layer did not significantly affect AC transport current and magnetization losses in the range of the experiment. Comparing the experimental data with theoretical analyses, it is pointed out that there are some discrepancies and that critical current distributions in the cross-sections of the conductors are a main cause of the discrepancies between the experimental data and theory. (C) 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physc.2004.01.123

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AC loss characteristics of YBCO coated conductors with Ag protection layer

OGAWA Jun, NAKAYAMA Haruki, ODAKA Shunsuke, TSUKAMOTO Osami

2004 ( 1 ) 79 - 82 2004.1

Study on suppression of decay of trapped magnetic field in metal impregnated YBCO bulk caused by application of AC magnetic field

ZUSHI Y., ASABA I., OGAWA J., YAMAGISHI K., TSUKAMOTO O., MURAKAMI M., TOMITA M.

2004 ( 17 ) 31 - 36 2004.1

Measurements of total AC losses HTS short sample wires by electric and calorimetric methods

J Ogawa, Y Yanagihara, Y Yamato, O Tsukamoto

ADVANCES IN CRYOGENIC ENGINEERING, VOLS 50A AND B 711 805 - 811 2004

Language：English Publisher：AMER INST PHYSICS

AC losses in a HTS tape carrying AC transport current in external AC Magnetic field were measured simultaneously by electric and calorimetric methods at the same part of the tape. The electric method uses a rectangular-shaped pick-up coil to measure the magnetization losses and the four terminal method with spiral voltage leads arrangement to measure the transport current losses. The calorimetric method uses a thermo-couple to measure temperature rise of the tape due to the AC losses. The total losses from the electric method which are given by addition of the electrically measured transport and magnetization losses well agreed with the total losses measured by the calorimetric method. This result verified the validity of the both electric and calorimetric methods.

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AC loss characteristics of YBCO coated conductors with Ag protection layer

OGAWA Jun, NAKAYAMA Haruki, ODAKA Shunsuke, TSUKAMOTO Osami

69 104 - 104 2003.12

Study on decay of trapped magnetic field in YBCO bulk due to AC magnetic field

OGAWA Jun, ZUSHI Yusuke, ASABA Isao, YAMAGISHI Kazuhito, TSUKAMOTO Osami, MURAKAMI Masato, TOMITA Masaru

69 192 - 192 2003.12

AC losses in a HTS coil carrying DC current in AC external magnetic field

J Ogawa, Y Zushi, M Fukushima, O Tsukamoto, E Suzuki, M Hirakawa, K Kikukawa

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 392 ( 2 ) 1145 - 1149 2003.10

Language：English Publisher：ELSEVIER SCIENCE BV

We electrically measured AC losses in a Bi2223/Ag-sheathed pancake coil excited by a DC current in AC external magnetic field. Losses in the coil contain two kinds of loss components that are the magnetization losses and dynamic resistance losses. In the measurement, current leads to supply a current to the coil were specially arranged to suppress electromagnetic coupling between the coil current and the AC external magnetic field. A double pick-up coils method was used to suppress a large inductive voltage component contained in voltage signal for measuring the magnetization losses. It was observed that the magnetization losses were dependent on the coil current and that a peak of a curve of the loss factor vs. amplitude of the AC external magnetic field shifted to lower amplitude of the AC magnetic field as the coil current increased. This result suggests the full penetration magnetic field of the coil tape decreases as the coil current increases. The dynamic resistance losses were measured by measuring a DC voltage appearing between the coil terminals. It was observed that the DC voltage appearing in the coil subject to the AC external magnetic field was much larger than that in the coil subject to DC magnetic field. (C) 2003 Elsevier B.V. All rights reserved.

DOI： 10.1016/S0921-4534(03)01112-2

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AC loss characteristics of twisted, multifilament Bi2223/Ag sheathed tapes carrying AC transport currents in AC longitudinal magnetic fields

J Ogawa, M Shiokawa, O Tsukamoto

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 13 ( 2 ) 2364 - 2367 2003.6

Language：English Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

This paper reports on the total AC loss characteristics of a twisted multifilamentary Bi2223/Ag sheathed tape carrying AC transport current in longitudinal AC magnetic field in phase with the transport current. The tape was specially made for the experiment and had wider space between superconducting filaments than a usual multifilamentary Bi/Ag sheathed tape to suppress superconducting bridgings between the filaments. In our experiment the total losses were measured by the electric method. The losses supplied from the longitudinal magnetic field were measured by using a pick-up coil and the losses supplied from the power supply for the transport current by a four terminal method. The measurement results showed that the total losses depended on the direction of the longitudinal magnetic field. In the case that the combined magnetic field produced by the transport current and the external longitudinal magnetic field was nearly parallel to the filaments of the twisted wire, the losses were smaller than those in the case that the combined field was nearly perpendicular to the filaments. This was observed when the amplitude of the longitudinal magnetic field was larger than the full penetration magnetic field of the wire.

DOI： 10.1109/TASC.2003.813070

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AC losses in YBCO coated conductors carrying transport currents in perpendicular AC external magnetic field

J Ogawa, M Shiokawa, M Ciszek, O Tsukamoto

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 13 ( 2 ) 1735 - 1738 2003.6

Language：English Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

The paper reports an experimental study on AC loss characteristics of a YBCO coated tape conductor carrying AC transport current in AC external magnetic field. In the experiment we electrically measured total losses that were transport current losses plus magnetization losses in AC external magnetic fields perpendicular to the tape surfaces. The transport current losses were measured by, a four terminal method and the magnetization losses by a method using a pick-up coil. To measure the total losses electrically we need to pay proper attentions to prevent electromagnetic coupling between the sample currents and the external magnetic fields and to suppress inductive voltage in signals from the pick-up coil and voltage taps. The total losses were purely hysteretic for the amplitude of the external field up to 20 mT and the peak transport current up to the critical current. The loss characteristics can be explained by a theory based on the Bean model if the dependence of the critical current on the external magnetic field is taken into consideration.

DOI： 10.1109/TASC.2003.812876

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Study of Quench Protection for YBCO HTS Coil Under Base Temperature Below 77K

FURUSE Mitsuho, FU Youkun, TSUKAMOTO Osami, OGAWA Jun

68 234 - 234 2003.5

Study to reduce the AC losses in YBCO tape subject to perpendicular magnetic field

OGAWA Jun, TANABE Takehiro, YOSHIDA Hidetaka, TSUAMOTO Osami

68 112 - 112 2003.5

Study of AC Transport Current Losses in Assembled Conductor of HTS Wires by Electrical Method

SUGIURA Kousuke, OGAWA Jun, YAMATO Yasunari, TSUKAMOTO Osami, HONJO Syoichi

68 196 - 196 2003.5

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