研究者詳細 - 小川　純

MISC - 小川　純

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四極磁場中に配置した微小チャネルを用いた磁性粒子の選択磁気分離

福井聡, 高橋衛, 山口貢, 小川純, 佐藤孝雄, 今泉洋, 大泉学, 小原健司, 渡邉恒雄, 西嶋茂宏

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 72 111 - 111 2005年5月

Y系薄膜導体を模擬した臨界電流密度分布を有するテープ線材の交流損失特性

小川純, 福井聡, 山口貢, 佐藤孝雄, 吉田俊秀, 塚本修巳

電気学会研究会資料. ASC, 超電導応用電力機器 2005 ( 13 ) 7 - 11 2005年1月

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年1月

平行配置したYBCOテープ線材の交流通電損失特性

中村智史, 小川悌知, 塚本修巳, 小川純

電気学会研究会資料. ASC, 超電導応用電力機器 2005 ( 1 ) 41 - 46 2005年1月

磁性の異なる基板を用いたホルミウム系線材の直流磁界下における通電損失特性

中山晴貴, 小高隼介, 内田修平, 塚本修巳, 宮城大輔, 小川純, 母倉修司, 上山宗譜, 大松一也

電気学会研究会資料. ASC, 超電導応用電力機器 2005 ( 1 ) 47 - 51 2005年1月

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年

曲げ応力下でのHTSテープ線材の交流損失特性

鈴木浩之, CISZEK M., 塚本修巳, 小川純

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 71 130 - 130 2004年11月

鞍型二重ピックアップコイルを用いた高温超伝導線材の全損失測定

小川純, 福井聡, 山口貢, 小林陽一, 小野寺暢

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 71 193 - 193 2004年11月

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年10月

記述言語：英語出版者・発行元：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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YBCO導体の交流損失に対する銀保護層の厚さの影響

小川純, 中山晴貴, 小高隼介, 塚本修巳

電気学会研究会資料. ASC, 超電導応用電力機器 2004 ( 1 ) 79 - 82 2004年1月

高温超伝導バルクの交流磁界中における捕捉磁界減少抑制方法の検討

図子祐輔, 麻場勲, 小川純, 山岸一人, 塚本修巳, 村上雅人, 富田優

電気学会研究会資料. ASC, 超電導応用電力機器 2004 ( 17 ) 31 - 36 2004年1月

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年

記述言語：英語出版者・発行元：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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銀の保護層の異なるYBCO線材における交流損失特性

小川純, 中山晴貴, 小高隼介, 塚本修巳

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 69 104 - 104 2003年12月

交流磁界によるYBCOバルクの捕捉磁界減少に関する研究

小川純, 図子祐輔, 麻場勲, 山岸一人, 塚本修巳, 村上雅人, 富田優

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 69 192 - 192 2003年12月

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年10月

記述言語：英語出版者・発行元：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年6月

記述言語：英語出版者・発行元：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年6月

記述言語：英語出版者・発行元：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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Y系高温超電導コイルのクエンチ保護の検討 : 動作温度を変化させた場合

古瀬充穂, 付猷昆, 塚本修巳, 小川純

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 68 234 - 234 2003年5月

Y系線材の交流垂直磁界に対する交流損失低減方法の提案

小川純, 田辺壮宏, 良田秀貴, 塚本修巳

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 68 112 - 112 2003年5月

高温超電導集合導体における通電損失の電気的測定法の検討

杉浦弘祐, 小川純, 大和康成, 塚本修巳, 本庄昇一

低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity 68 196 - 196 2003年5月

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