Naomichi Sakai

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Name
Naomichi Sakai
Affiliation
Shibaura Institute of Technology

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Tetsuo Oka, Akira Takeda, Hayami Oki, Jun Ogawa, Satoshi Fukui, Juliana Scheiter, Wolfgang Häßler, Kazuya Yokoyama, Kengo Yamanaka, Longji Dadiel, Muralidhar Miryala, Naomichi Sakai, Masato Murakami, Jacques Noudem
IEEE Transactions on Applied Superconductivity   29    Aug 2019
© 2019 IEEE. The magnetic flux dissipation from the MgB2 bulk magnets during pulsed field magnetization (PFM) processes has been estimated for the samples fabricated by hot-pressing (HP) and spark plasma sintering (SPS). We defined the parameters ...
T. Izumi, A. Ibi, K. Nakaoka, T. Taneda, T. Yoshida, Y. Takagi, T. Nakamura, T. Nakamura, T. Machi, K. Katayama, N. Sakai, M. Yoshizumi, T. Koizumi, K. Kimura, K. Kimura, T. Kato, T. Kiss, Y. Shiohara
Progress in Superconductivity and Cryogenics (PSAC)   16 1-6   Jan 2014
The five-year national project in Japan for R&D of coated conductors and applications, named as the Materials and Power Applications of Coated Conductors (M-PACC) project, was finished at the end of FY2013. The project consists of four sub-themes ...
SAKAI NAOMICHI, SHIGEMORI MASATAKA, IBI AKIRA, MACHI TAKATO, ENDO SAHO, NAKAOKA KOICHI, TANEDA TAKAHIRO, YOSHIZUMI MASATERU, TANABE KEIICHI, IZUMI TERUO
低温工学・超電導学会講演概要集   86th 46   Nov 2012
SAKAI NAOMICHI, SHIGEMORI MASATAKA, TOKUMARU MIYUKI, ENDO SAHO, TAKAHASHI YASUO, NAKAMURA TATSUNORI, IBI AKIRA, YOSHIZUMI MASAAKI, IZUMI TERUO
応用物理学会学術講演会講演予稿集(CD-ROM)   73rd ROMBUNNO.12P-A2-14   Aug 2012
SAKAI NAOMICHI, SHIGEMORI MASATAKA, MACHI TAKATO, IBI AKIRA, TAKAHASHI YASUO, TOKUMARU MIYUKI, YOSHIZUMI MASAAKI, TANABE KEIICHI, IZUMI TERUO
低温工学・超電導学会講演概要集   85th 138   Nov 2011
N. Sakai, S. Lee, N. Chikumoto, T. Izumi, K. Tanabe
Physica C: Superconductivity and its Applications   471 1075-1079   Nov 2011
We have studied delamination behavior of GdBa2Cu 3O7-d (Gd123) coated conductors fabricated by pulsed laser deposition. Two kinds of delamination tests, transverse tensile test and four points bending test, were performed. The delamination strengt...
Kohei Higashikawa, Yoshihiro Honda, Masayoshi Inoue, Takanobu Kiss, Noriko Chikumoto, Naomichi Sakai, Teruo Izumi, Hiroshi Okamoto
IEEE Transactions on Applied Superconductivity   21 3403-3407   Jun 2011
Combining scanning Hall-probe microscopy (SHPM) with finite element method (FEM), we have investigated three-dimensional current distribution at a silver diffusion joint of RE-123 coated conductor (CC). This research aims at the understanding of e...
SAKAI Naomichi, NARIKI Shinya, TESHIMA Eiichi, MORITA Mitsuru, HIRABAYASHI Izumi, NAKAMURA Takashi, ITOH Yoshitaka, YOSHIKAWA Masaaki, UTSUMI Hiroaki
TEION KOGAKU   46(3) 131-138   Mar 2011
In order to develop a compact cryogen-free 4.7-T (200 MHz) NMR magnet, we investigated methods of obtaining a homogeneous magnetic field distribution inside REBCO bulks. In this study we successfully fabricated large single-domain annular GdBCO bu...
NAKAMURA Takashi, ITOH Yoshitaka, YOSHIKAWA Masaaki, SAKAI Naomichi, NARIKI Shinya, HIRABAYASHI Izumi, UTSUMI Hiroaki
TEION KOGAKU   46(3) 139-148   Mar 2011
A compact cryogen-free NMR magnet was developed using annular bulk superconductors. The superconducting bulk magnet is energized using a field-cooling (FC) method operated at 4.7 T. Two magnets with different configurations are proposed and invest...
SAKAI NAOMICHI, WANG XUDONG, ISHIYAMA ATSUSHI, OMATSU KAZUYA, YAGI MASASHI, AOKI YUJI, SAITO TAKASHI, KATO TAKEHARU, IZUMI TERUO, TANABE KEIICHI
低温工学・超電導学会講演概要集   83rd 134   Dec 2010
SAKAI NAOMICHI, LEE SERGEY, CHIKUMOTO NORIKO, IZUMI TERUO, TANABE KEIICHI
応用物理学会学術講演会講演予稿集(CD-ROM)   71st ROMBUNNO.14P-T-14   Aug 2010
WANG XUDONG, ARAI MICHIO, ISHIYAMA ATSUSHI, SAITO TAKASHI, AOKI YUJI, YAGI MASASHI, SAKAI NAOMICHI, FUJIWARA NOBORU
低温工学・超電導学会講演概要集   82nd 73   May 2010
HIGASHIKAWA KOHEI, HONDA YOSHIHIRO, KAWAGUCHI TEPPEI, INOUE MASAYOSHI, KISU TAKANOBU, CHIKUMOTO NORIKO, SAKAI NAOMICHI, IZUMI TERUO, OKAMOTO HIROSHI
電気学会超電導応用電力機器研究会資料   ASC-10(17-27.29-39.41) 7-12   Jun 2010
HIGASHIKAWA KOHEI, HONDA YOSHIHIRO, INOUE MASAYOSHI, KISU TAKANOBU, CHIKUMOTO NORIKO, SAKAI NAOMICHI, IZUMI TERUO, OKAMOTO HIROSHI
低温工学・超電導学会講演概要集   82nd 5   May 2010
SAKAI NAOMICHI, NAKAO KOICHI, HATO YOSHIHIRO, WANG XUDONG, ISHIYAMA ATSUSHI, KATO TAKEHARU, YAGI MASASHI, AOKI YUJI, SERGEY LEE, CHIKUMOTO NORIKO, ICHIKAWA YUJI, FUJIWARA NOBORU, TANABE KEIICHI
低温工学・超電導学会講演概要集   82nd 15   May 2010
HIGASHIKAWA KOHEI, HONDA YOSHIHIRO, INOUE MASAYOSHI, KISU TAKANOBU, CHIKUMOTO NORIKO, SAKAI NAOMICHI, IZUMI TERUO, OKAMOTO HIROSHI
電気学会全国大会講演論文集   2010(5) 144   Mar 2010
M. Muralidhar, M. Muralidhar, M. Tomita, M. Jirsa, N. Sakai, M. Murakami, I. Hirabayashi
Physica C: Superconductivity and its Applications   469 1196-1199   Oct 2009
Flux pinning in melt-processed (Nd0.33Eu0.33Gd0.33)Ba2Cu3Oy "NEG-123" + 35 mol% Gd2BaCuO5 "NEG-211" (70 nm in size) composite doped by TiO3, MoO3 and Nb2O5 achieved record values. The optimum values of all three dopands were found to be around 0.1...
K. Nagashima, H. Seino, N. Sakai, M. Murakami
Physica C: Superconductivity and its Applications   469 1244-1249   Oct 2009
Stable levitation or suspension of a heavy object in mid-air can be realized using a combination of a permanent magnet and a bulk superconductor with high critical current density, in that the force density has reached 100 kN/m2. The superconducti...
Yan Xu, Yan Xu, Mitsuru Izumi, Keita Tsuzuki, Yufeng Zhang, Caixuan Xu, Masato Murakami, Naomichi Sakai, Izumi Hirabayashi
Superconductor Science and Technology   22    Sep 2009
Pinning stability and the introduction of pinning centers are essential problems in the application of high temperature superconductors. A study of the role of the addition of a variety of oxides into Gd-123 bulk superconductors was pursued with r...
SAKAI NAOMICHI, CHIKUMOTO NORIKO, MACHI TAKATO, TANABE KEIICHI
応用物理学会学術講演会講演予稿集   70th(1) 261   Sep 2009
HIGASHIKAWA Kohei, HONDA Yoshihiro, INOUE Masayoshi, KISS Takanobu, CHIKUMOTO Noriko, SAKAI Naomichi, IZUMI Teruo
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity   81 7   Nov 2009
Hiroyuki Fujishiro, Takuya Hiyama, Takashi Miura, Tomoyuki Naito, Shinya Nariki, Naomichi Sakai, Izumi Hirabayashi
IEEE Transactions on Applied Superconductivity   19 3545-3548   Jun 2009
The GdBaCuO superconducting bulk with stronger pinning characteristics (BT = 1.8 T at 77 K by the field cooled magnetization (FCM)) has been magnetized at Ts = 70 - 20 K by the pulsed field magnetization (PFM) techniques; a sequential pulsed-field...
K. Tsuzuki, D. Sugyo, Y. Kimura, M. Izumi, N. Sakai, M. Miki, H. Hayakawa
IEEE Transactions on Applied Superconductivity   19 2214-2217   Jun 2009
The high-temperature superconductor (HTS) bulk current lead (BCL) is a crucial device for a large number of currert applications such as the propulsion motor with HTS winding. The coexistence of low thermal conductivity and superconductivity enabl...
M. Muralidhar, M. Muralidhar, N. Sakai, M. Jirsa, S. Tanaka
Crystal Growth and Design   9 2404-2408   May 2009
Using a solid phase-liquid phase reaction we developed a new technology for preparing c-axis oriented thick ErBa 2Cu 3O y (Er-123) films on commercial polycrystalline silver substrates without the need for a buffer layer. The films were processed ...
M. Muralidhar, N. Sakai, M. Jirsa, M. Murakami, I. Hirabayashi
Ceramic Engineering and Science Proceedings   29 159-167   Mar 2009
The creation and control of nanoscale pinning media in melt-processed ternary superconductors (LRE1,LRE2,LRE3)- Ba2Cu3Oy (LRE=light rare earth) represent an important issue not only for the bulk form of these superconductors. Some of the nanometre...
Tetsuhiko Iizuka, Naomichi Sakai, Hiroyuki Fujita
Sensors and Actuators, A: Physical   150 110-115   Mar 2009
The driving characteristic of a conveyor with superconducting magnetic levitation is reported. A superconductor (Gd-Ba-Cu-O, Sintered plate) is used to levitate a slider on the surface of a superconductor. In this paper, magneto impedance sensors ...
Caixuan Xu, Caixuan Xu, Caixuan Xu, Anming Hu, Masaki Ichihara, Mitsuru Izumi, Yan Xu, Naomichi Sakai, Izumi Hirabayashi
Japanese Journal of Applied Physics   48    Feb 2009
Single-domain, c-axis-oriented 30-rnrn-diameter GdBa2Cu 3O7-δ (Gd123) melt-textured bulk superconductors have been successfully grown by the top-seeded melt growth method from precursors of Gd123, Gd2BaCuO5, and Ag2O in air with doping of nanosize...
Koichiro Sawa, Katsuya Fukuda, Kuniyasu Ogawa, Masaru Tomita, Masato Murakami, Naomichi Sakai, Izumi Hirabayashi
Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts   319-324   Dec 2008
A persistent current switch (PCS) is used for superconducting applications, such as superconducting magnetic energy storage (SMES) system. The authors have proposed a mechanical switch of Y-Ba-Cu-O (YBCO) bulk as a mechanical PCS. In previous stud...
T. Suzuki, S. Araki, K. Koibuchi, K. Ogawa, K. Sawa, K. Takeuchi, M. Murakami, M. Murakami, K. Nagashima, H. Seino, Y. Miyazaki, N. Sakai, I. Hirabayashi, Y. Iwasa
Physica C: Superconductivity and its Applications   468 1461-1464   Sep 2008
We have studied the levitation force of a Gd-Ba-Cu-O bulk superconductor 60 mm in diameter and 20 mm in thickness with a newly developed superconducting magnet system that can provide high field gradient. The magnet system was composed of two supe...
J. Kato, N. Sakai, S. Miyata, A. Ibi, Y. Sutoh, Y. Yamada, N. Chikumoto, K. Nakao, T. Izumi, Y. Shiohara
Physica C: Superconductivity and its Applications   468 1571-1574   Sep 2008
We succeeded in repairing YBCO coated conductors with local damage using the diffusion joint technique of stabilizing silver layers. A short piece of YBCO coated conductor was put on the damaged part in a face to face manner and joined by the diff...
Y. Xu, Y. Xu, A. Hu, C. Xu, N. Sakai, I. Hirabayashi, M. Izumi
Physica C: Superconductivity and its Applications   468 1363-1365   Sep 2008
Single domain Gd123 bulk superconductors have been fabricated successfully with doping both ZrO2 and ZnO nanoparticles by a hot seeded melt growth in air. Superconductive properties were studied on the specimens selected from different positions o...
M. Muralidhar, N. Sakai, T. Machi, T. Miyajiri, I. Hirabayashi, S. Tanaka
Physica C: Superconductivity and its Applications   468 1345-1349   Sep 2008
We have developed a low-cost, short time manufacturing process using a novel method, starting from a mixture of Er2BaO4, BaCuO2, and CuO, with an excess of Er at expense of Ba. Several micrometers thick films were prepared by the screen-printing t...
S. Nariki, N. Sakai, I. Hirabayashi, M. Yoshikawa, Y. Itoh, T. Nakamura, H. Utumi
Physica C: Superconductivity and its Applications   468 1451-1455   Sep 2008
We have investigated the fabrication and the superconducting and field trapping properties of large melt-textured Eu-Ba-Cu-O bulk superconductors for the purpose of application as a compact NMR magnet. We successfully fabricated c-axis oriented si...
K. Fukuda, H. Fujita, K. Ogawa, M. Tomita, M. Murakami, N. Sakai, I. Hirabayashi, K. Sawa
Physica C: Superconductivity and its Applications   468 1465-1468   Sep 2008
A persistent current switch (PCS) is used for various superconducting applications, such as superconducting magnetic energy storage (SMES) system. The authors have proposed a mechanical switch of Y-Ba-Cu-O (YBCO) bulk as a PCS. In previous study, ...
K. Iida, N. H. Babu, Y. Shi, S. K. Pathak, W. K. Yeoh, T. Miyazaki, T. Miyazaki, N. Sakai, M. Murakami, M. Murakami, D. A. Cardwell
Physica C: Superconductivity and its Applications   468 1387-1390   Sep 2008
Single grain, Ag-doped Y-Ba-Cu-O bulk superconductors of up to 30 mm in diameter have been fabricated successfully by a seeded infiltration and growth (IG) technique. These samples exhibit low porosity compared with samples grown by conventional t...
M. Muralidhar, M. Jirsa, N. Sakai, M. Murakami, I. Hirabayashi
Materials Science and Engineering B: Solid-State Materials for Advanced Technology   151 90-94   Jun 2008
The Jc and Hirr values at 77 K of ternary light-rare-earth compounds, LREBa2Cu3Oy "LRE-123", are usually high enough to serve in various applications. Several sources of vortex pinning can be in these composites tailored to fit the needs of the pa...
K. Iida, N. H. Babu, N. H. Babu, S. Pathak, Y. Shi, W. K. Yeoh, T. Miyazaki, T. Miyazaki, N. Sakai, M. Murakami, D. A. Cardwell
Materials Science and Engineering B: Solid-State Materials for Advanced Technology   151 2-6   Jun 2008
A pseudo Time-Temperature-Transformation (TTT) diagram has been constructed for the optimum melt processing conditions for the fabrication of large, single grain Ag-doped Y-Ba-Cu-O (YBCO/Ag) bulk superconductors. The thermal conditions for the for...
Ken Nagashima, Hiroshi Seino, Yoshiki Miyazaki, Yuuki Arai, Naomichi Sakai, Masato Murakami
Quarterly Report of RTRI (Railway Technical Research Institute) (Japan)   49 127-132   May 2008
Stable levitation or suspension of a heavy object in mid-air can be realized using a combination of a permanent magnet and a bulk superconductor with high critical current density, in that the force density has reached 100 kN/m2. The superconducti...
M. Muralidhar, N. Sakai, M. Jirsa, M. Murakami, I. Hirabayashi
Applied Physics Letters   92    May 2008
We report on a highly improved pinning performance in the melt-textured (Nd0.33 Eu0.33 Gd0.33) Ba2 Cu3 Oy +35 mol % Gd2 BaCu O5 (70 nm in size) composite doped by tiny amounts of nanometer-sized Mo O3 or Nb O3 particles. The doping led to a sponta...
Motohide Matsui, Motohide Matsui, Norichika Tsuji, Shinya Nariki, Naomichi Sakai, Kengo Iwafuchi, Masato Murakami
Superconductor Science and Technology   21    Apr 2008
We employed Ba-Cu-O substrates for fabrication of bulk Y-Ba-Cu-O superconductors using the top-seeded melt-growth method. There were several advantages of using a Ba-Cu-O substrate as compared to conventional substrate materials such as MgO, ZrO2,...
FUJISHIRO HIROYUKI, HIYAMA TAKUYA, MIURA TAKASHI, NAITO TOMOYUKI, NARIKI SHIN'YA, SAKAI NAOMICHI, HIRABAYASHI IZUMI
応用物理学関係連合講演会講演予稿集   55th(1) 306   Mar 2008
SHIMOYAMA JUN'ICHI, SAKAI NAOMICHI, SATO TETSURO, NAITO MASAO
応用物理学関係連合講演会講演予稿集   55th(0) TOKUBETSU6   Mar 2008
FUKUDA KATSUYA, OGAWA KUNIYASU, TOMITA MASARU, MURAKAMI MASATO, SAKAI NAOMICHI, HIRABAYASHI IZUMI, SAWA KOICHIRO
電子情報通信学会大会講演論文集   2008 6   Mar 2008
Fukuda Katsuya, Ogawa Kuniyasu, Tomita Masaru, Murakami Masato, Sakai Naomichi, Sawa Koichiro
Proceedings of the IEICE General Conference   2008(2)    Mar 2008
FUJISHIRO Hiroyuki, HIYAMA Takuya, MIURA Takashi, NAITO Tomoyuki, NARIKI Shinya, SAKAI Naomichi, HIRABAYASHI Izumi
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity   78 2   May 2008
S. Nariki, N. Sakai, I. Hirabayashi, M. Yoshikawa, Y. Itoh, T. Nakamura, H. Utsumi
Journal of Physics: Conference Series   97    Feb 2008
We have investigated the fabrication and position dependence of superconducting properties of large melt-textured Eu-Ba-Cu-O bulk superconductors for the purpose of application as a compact NMR magnet. We successfully fabricated c-axis oriented si...
M. Matsui, M. Matsui, N. Tsuji, S. Nariki, N. Sakai, K. Iwafuchi, M. Murakami
Journal of Physics: Conference Series   97    Feb 2008
We employed Ba-Cu-O substrates for fabrication of bulk Y-Ba-Cu-O superconductors in the top-seeded melt-growth method. There were several advantages for a use of a Ba-Cu-O substrate compared to conventional substrate materials such as MgO, ZrO2, A...
M. Izumi, C. Xu, A. Hu, M. Ichihara, Y. Xu, E. Morita, E. Morita, Y. Kimura, M. Murakami, N. Sakai, I. Hirabayashi, H. Sugimoto, M. Miki
Journal of Physics: Conference Series   97    Feb 2008
Gd123 bulk superconductor is one of the promising magnet materials. We studied the materials processing to grow high performance magnet with a doping of nano-sized metal oxides such as ZrO2 as a candidature of pinning centre. The enhancement of th...
Y. Kimura, Y. Kimura, K. Yamaguchi, T. Sano, D. Sugyo, M. Izumi, T. Ida, S. Nariki, N. Sakai, I. Hirabayashi, M. Miki
Journal of Physics: Conference Series   97    Feb 2008
We studied a pulsed field magnetization (PFM) of bulk HTS assembled into a synchronous motor as a field-pole. The PFM is essential to apply bulk HTS inside the machine as a practical technique. In the present study, we developed a PFM technique th...
K. Yamaguchi, Y. Kimura, Y. Kimura, M. Izumi, S. Nariki, N. Sakai, I. Hirabayashi
Journal of Physics: Conference Series   97    Feb 2008
Pulsed-field magnetization (PFM) was applied to a Gd-Ba-Cu-O high-temperature superconductor (HTS) bulk of 140 mm diameter by using a split-type pulsed current armature coil. Two kinds of split-armature coils with 100 mm and 140 mm diameter were t...
Kazumasa Iida, Nadendla Hari Babu, Nadendla Hari Babu, Yunhua Shi, Taro Miyazaki, Taro Miyazaki, Naomichi Sakai, Masato Murakami, David A. Cardwell
Journal of Physics: Conference Series   97    Feb 2008
We have applied the seeded infiltration and growth (IG) technique to the processing of samples containing Ag in an attempt to fabricate Ag-doped Y-Ba-Cu-O (YBCO) bulk superconductors with enhanced mechanical properties. The IG technique has been u...
M. Muralidhar, N. Sakai, T. MacHi, I. Hirabayashi, S. Tanaka
Journal of Physics: Conference Series   97    Feb 2008
We report on a novel technique of growing highly c-axis oriented ErBa 2Cu3Oy (Er-123) thick films on commercial silver substrates, starting from Er2BaO4, BaCuO 2, and CuO powders mixed in an Er-rich Er-123 ratio. Thick films are prepared by the sc...
Katsuya Fukuda, Hiroyuki Fujita, Koichiro Sawa, Masaru Tomita, Masato Murakami, Naomichi Sakai, Izumi Hirabayashi
Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts   76-81   Dec 2007
A persistent current switch (PCS) is used for superconducting applications, such as superconducting magnetic energy storage (SMES) system. The authors have proposed a mechanical switch of Y-Ba-Cu-O (YBCO) bulk as a mechanical PCS. In previous repo...
Hiroyuki Fujita, Hiroyuki Fujita, Katsuya Fukuda, Koichiro Sawa, Masaru Tomita, Masato Murakami, Naomichi Sakai, Izumi Hirabayashi
Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts   124-130   Dec 2007
A persistent current switch (PCS) is used for superconducting applications, such as superconducting magnetic energy storage (SMES) system. The authors have proposed a mechanical switch of Y-Ba-Cu-O (YBCO) bulk as a mechanical PCS. In this paper, t...
H. Fujita, K. Fukuda, M. Tomita, M. Murakami, M. Murakami, N. Sakai, I. Hirabayashi, K. Sawa
Physica C: Superconductivity and its Applications   463-465 415-419   Oct 2007
A persistent current switch (PCS) is used for superconducting applications, such as superconducting magnetic energy storage (SMES) system. The authors have proposed a mechanical switch of YBCO bulk as a mechanical PCS. This paper focused on the cu...
K. Fukuda, H. Fujita, M. Tomita, M. Murakami, M. Murakami, N. Sakai, I. Hirabayashi, K. Sawa
Physica C: Superconductivity and its Applications   463-465 1361-1364   Oct 2007
A persistent current switch (PCS) is used for superconducting applications, such as superconducting magnetic energy storage (SMES) system. The authors have proposed a mechanical switch of Y-Ba-Cu-O (YBCO) bulk as a mechanical PCS. In previous stud...
C. Xu, C. Xu, A. Hu, M. Ichihara, N. Sakai, M. Izumi, I. Hirabayashi
Physica C: Superconductivity and its Applications   463-465 367-370   Oct 2007
We, respectively, fabricated GdBa2Cu3O7-δ (Gd123) single domain superconductors by melt growth process in air with Gd2Ba4CuZrOx (GdZr2411) and nanosize ZrO2 dopants. The microstructures and superconducting properties were investigated by scanning/...
R. Tsuru, T. Tanaka, T. Nakajima, T. Seike, H. Hirano, M. Morita, H. Teshima, S. Nariki, N. Sakai, I. Hirbayashi, H. Kitamura, H. Kitamura, H. Kitamura
Physica C: Superconductivity and its Applications   463-465 1333-1337   Oct 2007
A new concept of synchrotron radiation (SR) sources with ring-shaped high-Tc superconducting bulk (bulk ring) magnets have been proposed at the SPring-8, a SR facility in Japan. During the proof-of-principle experiments, it was found that the magn...
S. Nariki, N. Sakai, M. Murakami, M. Murakami, I. Hirabayashi
Physica C: Superconductivity and its Applications   463-465 308-313   Oct 2007
On the processing melt-textured RE-Ba-Cu-O bulk superconductors, we investigated the formation of defects in green bodies during powder compression process and the effect of the defects on the final bulk products. Two kinds of Y-Ba-Cu-O powders wi...
N. Sakai, S. Nariki, M. Nishimura, M. Nishimura, T. Miyazaki, T. Miyazaki, M. Murakami, M. Murakami, M. Miryala, I. Hirabayashi
Physica C: Superconductivity and its Applications   463-465 348-352   Oct 2007
We have studied the magnetic field distribution of the stacked two single domain Gd-Ba-Cu-O large bulk superconductors exceeding 140 mm in diameter, and compared with the distribution of one single domain bulk. The maximum trapped magnetic field o...
T. Suzuki, S. Araki, K. Takeuchi, M. Murakami, M. Murakami, K. Nagashima, Y. Miyazaki, H. Seino, N. Sakai, I. Hirabayashi, K. Sawa
Physica C: Superconductivity and its Applications   463-465 383-386   Oct 2007
We studied the effects of magnetic field and the temperature on the levitation force for a bulk Gd-Ba-Cu-O superconductor 60 mm in diameter and 20 mm in thickness. Magnetic field distribution in the bulk body was monitored with Hall sensors placed...
J. Kato, N. Sakai, S. Miyata, M. Konishi, Y. Yamada, N. Chikumoto, K. Nakao, T. Izumi, Y. Shiohara
Physica C: Superconductivity and its Applications   463-465 747-750   Oct 2007
Diffusion joint processes using Ag stabilizing layer for YBCO tape were performed in varied parameter such as temperature, time duration, cooling procedure and conditions of surface for Ag stabilizing layer to optimize for joint condition. We succ...
K. Iida, N. H. Babu, Y. Shi, L. S. Matthews, T. Miyazaki, N. Sakai, M. Murakami, M. Murakami, D. A. Cardwell
Physica C: Superconductivity and its Applications   463-465 340-343   Oct 2007
The thermodynamic stability of MgO-doped Nd1+xBa2-xCu3Oy (x = 0-0.5) has been investigated as a function of solid solution level (x) under various oxygen partial pressures for use as a seed crystal composition in the melt growth of (LRE)-Ba-Cu-O (...
M. Muralidhar, N. Sakai, T. Machi, I. Hirabayashi, S. Tanaka
Physica C: Superconductivity and its Applications   463-465 314-319   Oct 2007
With the aim to develop low cost, high performance superconducting thick films, we tested a new method, starting from a mixture of Er2BaO4, BaCuO2, and CuO in the stoichiometric Er-123 ratio. Thick films were prepared by the screen printing techni...
SAKAI NAOMICHI, NARIKI SHIN'YA, HIRABAYASHI IZUMI, YOSHIKAWA MASAAKI, ITO YOSHITAKA, NAKAMURA TAKASHI, UTSUMI HIROAKI
応用物理学会学術講演会講演予稿集   68th(1) 290   Sep 2007
NARIKI SHIN'YA, SAKAI NAOMICHI, HIRABAYASHI IZUMI
応用物理学会学術講演会講演予稿集   68th(1) 290   Sep 2007
Caixuan Xu, Caixuan Xu, Anming Hu, Masaki Ichihara, Naomichi Sakai, Izumi Hirabayashi, Mitsuru Izumi
Physica C: Superconductivity and its Applications   460-462 II 1341-1342   Sep 2007
Nano-sized centers for magnetic flux pinning were successfully introduced into a bulk superconductor GdBa2Cu3O7-δ (Gd123) by mixing ZrO2 nanoparticles with precursor prior the melt growth in air. Superconducting properties and structure of doped G...
N. Sakai, S. Nariki, K. Nagashima, M. Miryala, M. Murakami, M. Murakami, I. Hirabayashi
Physica C: Superconductivity and its Applications   460-462 I 305-309   Sep 2007
We have studied magnetic properties of a single grain Gd-Ba-Cu-O bulk superconductor 140 mm in diameter. The distribution of the trapped magnetic field showed that the sample was a single domain without serious weak links. The maximum trapped magn...
NAGASHIMA KEN, SEINO HIROSHI, MIYAZAKI YOSHIKI, ARAI YUKI, SAKAI NAOMICHI, MURAKAMI MASATO
鉄道総研報告   21(9) 29-34   Sep 2007
HIRATA HIROMASA, HIRABAYASHI IZUMI, SAKAI NAOMICHI
日本機械学会動力・エネルギー技術シンポジウム講演論文集   12th 337-340   Jun 2007
MIYAZAKI Taro, MURAKAMI Masato, NARIKI Shinya, SAKAI Naomithi, HIRABAYASI Izumi
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity   77 160   Nov 2007
KATO Junko, SAKAI Naomichi, IBI Akira, MIYATA Seiki, SUTO Yasuonri, NAKAO Koichi, IZUMI Teruo, SIOHARA Yuh
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity   77 153   Nov 2007
WASHIMI Tomoyuki, KATO Junko, SAKAI Naomichi, MIYATA Seiki, IBI Akira, YAMADA Yutaka, KASHIMA Naoji, NAGAYA Shigeo, NAKAO Koichi, IZUMI Teruo, SHIOHARA Yuh, MURAKAMI Masato
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity   77 115   Nov 2007
KATO Junko, SAKAI Naomichi, KASHIMA Naoji, NAGAYA Shigeo, IBI Akira, MIYATA Seiki, NAKAO Koichi, IZUMI Teruo, SHIOHARA Yuh
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity   77 114   Nov 2007
TAKEUCHI Koji, NASHIMA Ken, SEINO Hiroshi, SUZUKI Tomoyuki, ARAKI Satoshi, SAKAI Naomichi, MURAKAMI Masato
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity   77 97   Nov 2007
Caixuan Xu, Anming Hu, Masaki Ichihara, Naomichi Sakai, Izumi Hirabayashi, Mitsuru Izumi
IEEE Transactions on Applied Superconductivity   17 2980-2983   Jun 2007
Bulk GdBa2Cu3O7-δ (Gd123) superconductors were fabricated in air by adding ZrO2/SnO2 nanoparticles with an average size of 50 nm. The effect of addition on microstructure and superconducting properties was investigated by scanning electron microsc...
T. Suzuki, E. Ito, T. Sakai, S. Koga, M. Murakami, K. Nagashima, Y. Miyazaki, H. Seino, N. Sakai, I. Hirabayashi, K. Sawa
IEEE Transactions on Applied Superconductivity   17 3020-3023   Jun 2007
High-temperature superconductors (HTS) have high potential for various engineering applications such as a superconducting flywheel energy storage system. The attractive feature of the superconducting magnetic bearings in the energy storage system ...
Caixuan Xu, Caixuan Xu, Anming Hu, Naomichi Sakai, Izumi Hirabayashi, Mitsuru Izumi
Journal of Superconductivity and Novel Magnetism   20 309-314   May 2007
Single domain GdBa 2Cu 7-δ (Gd123) bulk superconductors were fabricated in air by top-seeding melt-texture growth. Performance of the air-processed Gd123 was successfully enhanced by addition of both BaCO 3 and BaCuO 2-x , which suppress the forma...
T. Tanaka, R. Tsuru, T. Seike, H. Hirano, M. Morita, H. Teshima, S. Nariki, N. Sakai, I. Hirabayashi, M. Murakami, H. Kitamura
AIP Conference Proceedings   879 297-300   Mar 2007
Utilization of superconducting permanent magnets is now under investigation at SPring-8 for future development of synchrotron radiation sources, and several concepts has been reported so far. In one of them, ring-shaped bulk superconductors (ring ...
FUJITA HIROYUKI, FUKUDA KATSUYA, SAWA KOICHIRO, TOMITA MASARU, MURAKAMI MASATO, SAKAI NAOMICHI, HIRABAYASHI IZUMI
電気学会全国大会講演論文集   2007(5) 51-52   Mar 2007
ARAKI SATOSHI, SUZUKI TOMOYUKI, SAWA KOICHIRO, NAGASHIMA KEN, TAKEUCHI KOJI, MURAKAMI MASATO, SAKAI NAOMICHI, HIRABAYASHI IZUMI
電気学会全国大会講演論文集   2007(5) 99-100   Mar 2007
FUKUDA KATSUYA, FUJITA HIROYUKI, TOMITA MASARU, MURAKAMI MASATO, SAKAI NAOMICHI, HIRABAYASHI IZUMI, SAWA KOICHIRO
電子情報通信学会大会講演論文集   2007 5   Mar 2007
HIRATA Hiromasa, HIRABAYASHI Izumi, SAKAI Naomichi
National Symposium on Power and Energy Systems   2007(12) 337-340   Jun 2007
From the viewpoints of global warming and utilization of effective renewable energies, introduction of the wind power has been making progress rapidly. Especially in Europe and the United States, the development of the large scale wind turbine sys...
MIYAZAKI Taro, MURAKAMI Masato, NARIKI Shinya, SAKAI Naomichi, HIRABAYASHI Izumi
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity   76 66   May 2007
YAMAGUCHI Kumiko, KIMURA Yousuke, IZUMI Mitsuru, NARIKI Shinya, SAKAI Naomichi, HIRABAYASHI Izumi, MIKI Motohiro
低温工学・超電導学会講演概要集 = Meetings of Cryogenics and Superconductivity   76 65   May 2007
NARIKI Shinya, SAKAI Naomichi, HIRABAYASHI Izumi
TEION KOGAKU   42(1) 18-23   2007
In the production of melt-textured RE-Ba-Cu-O bulk superconductors, the precursors are generally prepared by uniaxial and/or cold-isostatic pressing of raw powders. The employment of fine starting powders is effective in fabricating high-performan...
Hiroyuki Fujita, Katsuya Fukuda, Koichiro Sawa, Masaru Tomita, Masato Murakami, Naomichi Sakai, Izumi Hirabayashi
23rd International Conference on Electrical Contacts, ICEC 2006 - together with the 6th International Session on Electromechanical Devices, IS-EMD 2006   390-395   Dec 2006
A persistent current switch (PCS) is used for superconducting applications, such as superconducting magnetic energy storage (SMES) system. The authors have proposed a mechanical switch of Y-Ba-Cu-O (YBCO) bulk as a mechanical PCS. From the previou...
T. Tanaka, T. Hara, T. Bizen, T. Seike, R. Tsuru, X. Marechal, H. Hirano, M. Morita, H. Teshima, S. Nariki, N. Sakai, I. Hirabayashi, M. Murakami, H. Kitamura
New Journal of Physics   8    Nov 2006
The cryogenic permanent magnet undulator (CPMU) is an insertion device in which permanent magnets (PMs) are cooled to a cryogenic temperature to improve magnetic performances in terms of remanence and coercivity. Operation of CPMUs is expected to ...
KATO JUNKO, SAKAI NAOMICHI, MIYATA SEIKI, KONISHI MASAYA, YAMADA YUTAKA, CHIKUMOTO NORIKO, NAKAO KOICHI, IZUMI TERUO, SHIOHARA YU
低温工学・超電導学会講演概要集   75th 187   Nov 2006
NARIKI SHIN'YA, SAKAI NAOMICHI, HIRABAYASHI IZUMI
低温工学・超電導学会講演概要集   75th 83   Nov 2006
Fukuda Katsuya, Fujita Hiroyuki, Tomita Masaru, Murakami Masato, Sakai Naomichi, Hirabayashi Izumi, Sawa Koichiro
Proceedings of the IEICE General Conference   2007(2)    Mar 2007
NAGASHIMA KEN, SEINO HIROSHI, SAWA KOICHIRO, SAKAI NAOMICHI, MURAKAMI MASATO
電気学会超電導応用電力機器研究会資料   ASC-07(1-2.4-9.11-17) 45-49   Jan 2007
SAKAI NAOMICHI
電気学会超電導応用電力機器研究会資料   ASC-07(1-2.4-9.11-17) 11-14   Jan 2007
Caixuan Xu, Caixuan Xu, Anming Hu, Masaki Ichihara, Naomichi Sakai, Izumi Hirabayashi, Mitsuru Izumi
Superconductor Science and Technology   19 1285-1290   Nov 2006
We have studied the microstructure of melt-growth GdBa2Cu 3O7-δ (Gd123) bulk superconductors with the addition of Gd2Ba4CuMOx (abbreviated as M2411 with M ≤ Mo or Zr) particles by transmission electron microscopy. Gd123 bulks are prepared with nom...
Hiroyuki Fujita, Masaru Tomita, Masaru Tomita, Masato Murakami, Masato Murakami, Naomichi Sakai, Izumi Hirabayashi, Koichiro Sawa
Physica C: Superconductivity and its Applications   445-448 1123-1126   Oct 2006
A persistent current switch (PCS) is used for superconducting applications, such as superconducting magnetic energy storage (SMES) system. The authors have proposed a mechanical switch of YBCO bulk as a mechanical PCS. From the previous research, ...
J. Y. Kato, N. Sakai, S. Tajima, S. Tajima, S. Miyata, M. Konishi, Y. Yamada, N. Chikumoto, K. Nakao, T. Izumi, Y. Shiohara
Physica C: Superconductivity and its Applications   445-448 686-688   Oct 2006
We developed a very simple and new joint technique for coated conductors that could achieve a very low resistance less than 0.02 μΩ across the joint with an area of 2 × 20 mm2 without any degradation of Ic. It is a diffusion joint using the Ag sta...
M. Kita, S. Nariki, N. Sakai, I. Hirabayashi
Physica C: Superconductivity and its Applications   445-448 375-378   Oct 2006
Gd-Ba-Cu-O bulk superconductors have significant potential for various applications due to the high critical current density and the highly trapped magnetic fields. Recently we have developed a large sized bulk superconductor using Gd210, which is...
K. Inoue, N. Sakai, M. Murakami, M. Murakami, I. Hirabayashi
Physica C: Superconductivity and its Applications   445-448 128-132   Oct 2006
Long period post-annealing in the oxygen atmosphere is necessary for YBa2Cu3Ox (Y123) bulk superconductors to impart superconductivity. We have investigated whether Y123 shows good superconductivity without oxygen annealing by potassium addition. ...
S. Nariki, N. Sakai, M. Murakami, M. Murakami, I. Hirabayashi
Physica C: Superconductivity and its Applications   445-448 291-294   Oct 2006
We investigated processing, microstructure and superconducting properties of Gd123 single grain bulk superconductors with a large amount of BaCeO3. The melt-textured bulk samples with compositions of Gd123 : BaCeO3 : Gd211 = 100 : 40-x : x (x = 0-...
N. Sakai, M. Kita, S. Nariki, M. Muralidhar, K. Inoue, I. Hirabayashi, M. Murakami, M. Murakami
Physica C: Superconductivity and its Applications   445-448 339-342   Oct 2006
We have studied field trapping ability of single grain Gd-Ba-Cu-O bulk superconductor 140 mm in diameter, which was fabricated by using Gd2BaO4 and Ba-Cu-O phase as raw materials. The distribution of the trapped magnetic field showed single domain...

Research Grants & Projects

 
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2006 - 2008    Investigator(s): Mitsuru IZUMI