Faculty Profiles - OGAWA Jun

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HTSバルク磁石への複数回パルス着磁;去における残留磁場分布形状に対する磁束侵入

岡徹雄, 原健介, 小川純, 福井聡, 佐藤孝雄, 横山和哉, 村上明

低温工学・超電導学会講演概要集 93rd 42 2016.5

複数枚積層したディスク型MgB<sub>2</sub>バルク超伝導体のパルス着磁

宮崎泰輔, 稲垣智大, 小川純, 福井聡, 佐藤孝雄, HAESSLER Wolfgang, 横山和哉, 岡徹雄

電気学会全国大会講演論文集(CD-ROM) 2016 ROMBUNNO.5‐106 2016.3

超伝導バルク磁石における逆磁場を用いた複数回パルス着磁の研究

原健介, 下田竜也, 太田博之, 阿久津裕哉, 小川純, 福井聡, 佐藤孝雄, 岡徹雄, 横山和也

電気学会全国大会講演論文集(CD-ROM) 2016 ROMBUNNO.5‐105 2016.3

HTSバルク磁石を使ったIPMモータ回転子の新しい着磁法とその磁場特性

岡徹雄, 渡邊大史, 玄海亨, 福井聡, 小川純, 佐藤孝雄, 中野智仁, 横山和哉

電気学会全国大会講演論文集(CD-ROM) 2016 ROMBUNNO.5‐107 2016.3

Uniform Magnetic Field between Face-to-Face HTS Bulk Magnets Combining Concave and Convex Magnetic Field Distributions

T. Oka, Y. Takahashi, S. Yaginuma, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, T. Nakamura

Physics Procedia 81 45 - 48 2016

Language：English Publisher：Elsevier B.V.

The authors have been attempting to obtain the uniform magnetic field distribution in the space between the face-to-face HTS bulk magnets. The magnetic poles containing the HTS bulk magnets are usually characterized as non-uniform magnetic field distribution. Since the distributions show the conical or convex shapes, it is difficult to obtain the uniform magnetic field spaces even when the magnetic poles would be placed face-to-face. The authors have modified the shape of the distribution of one-side magnetic pole by attaching an iron plate on the surface, and formed the concave magnetic field distribution on the pole surface. The steep concave or convex distributions at each pole surface change to be flat with increasing distance from the pole surface. After the experimental result recording the best uniformity of 358 ppm by combining the concave and convex field distributions face-to-face, we attempted to simulate the feasible performance in this configuration. In the numerical simulation, the concave field distribution modified by attaching an imaginary spiral coil on the pole surface was coupled with the original convex field. We succeeded in obtaining the best uniformity of 30 ppm at 1.1 T in 4 x 4 mm2 x-y plane at 7 mm distant from the pole surface in the gap of 30 mm. This result suggests that the concave and convex magnetic field distributions compensate the field uniformity with each other with keeping the magnetic field strength in the gap, and also suggests the novel compact NMR/MRI devices in the future.

DOI： 10.1016/j.phpro.2016.04.019

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二層ツイスト高温超伝導ケーブルのツイスト方向による交流損失特性への影響

小川純, 福井聡, 岡徹雄, 佐藤孝雄, 原祐輔, 東條竜児, 小川智也

低温工学・超電導学会講演概要集 92nd 227 2015.12

超伝導バルク磁石を用いたセシウムの磁気分離

町田祥平, 高柳優也, 一重佳那, 小川純, 福井聡, 佐藤孝雄, 大泉学, 岡徹雄, 大西徳幸

低温工学・超電導学会講演概要集 91st 52 2015.5

二層ツイスト高温超電導ケーブルの部分的断熱による交流損失の熱的測定

原祐輔, 東條竜児, 小川純, 福井聡, 岡徹雄, 佐藤孝雄

低温工学・超電導学会講演概要集 91st 54 2015.5

鉄心内に挿入された高温超伝導集合導体の交流損失特性の実験的評価

多田寛明, 桜井達哉, 吉井佑斗, 佐野佑樹, 小川純, 福井聡, 岡徹雄, 佐藤孝雄

低温工学・超電導学会講演概要集 91st 55 2015.5

高温超伝導バルク磁石のパルス着磁における捕捉磁場の散逸現象の評価

岡徹雄, 太田博之, 下田竜也, 原健介, 小川純, 福井聡, 佐藤孝雄, 横山和哉

低温工学・超電導学会講演概要集 91st 172 2015.5

高温超伝導バルク磁石のパルス着磁における異方的な磁場侵入挙動

岡徹雄, 太田博之, 下田達也, 小川純, 福井聡, 佐藤孝雄, 横山和哉, 村上明, LANGER Marco

電気学会全国大会講演論文集(CD-ROM) 2015 ROMBUNNO.5-088 2015.3

HTSバルク磁石を用いた硫酸ニッケル結晶のOGMS

高柳優也, 町田祥平, 一重佳奈, 福井聡, 小川純, 佐藤孝雄, 大泉学, 岡徹雄, 横山和哉, 辻村盛男

電気学会全国大会講演論文集(CD-ROM) 2015 ROMBUNNO.5-087 2015.3

Attempt to generate a strong and uniform magnetic field by face-to-face HTS bulk elements in a magnet system

Tetsuo Oka, Eri Hirayama, Yasuhiro Takahashi, Tomoaki Kanai, Jun Ogawa, Satoshi Fukui, Takao Sato, Kazuya Yokoyama, Takashi Nakamura

Physics Procedia 67 1005 - 1009 2015

© 2015 The Authors. A unique experimental attempt aiming to obtain a uniform magnetic field space as required for NMR has been carried out with use of HTS bulk magnets. The magnetic poles were activated as 1.8 T (North) and 1.4 T (South) at 30 K by applyinga pulsed magnetic field up to 7 T, and positioned face-to-face with gaps less than 70 mm. The uniformity of the magnetic field required for detecting the NMR signals isless than 1,500 ppm at more than 0.3 T in the cross sectional plane of 2 x 2 mm2. After thepreliminary trials whichrevealed auniformity of 5,421 ppm at 0.44 T in a70 mm gap, we attached a ferromagnetic iron plate to a magnetic pole surface to change the magnetic field distribution to be concave. The best uniformity of 358 ppm at 1.11 T was obtained at 9 mm distance from the iron plate surface in a gap of 30 mm. It is stated that the concave magnetic field distribution was compensated by the counter conical-shape field, resulting in the uniform field plane.

DOI： 10.1016/j.phpro.2015.06.187

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逆磁場を用いた複数回パルス着磁の検討

下田竜也, 太田博之, 原健介, 佐藤孝雄, 小川純, 福井聡, 岡徹雄, 横山和哉

低温工学・超電導学会講演概要集 90th 53 2014.11