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26 results on '"Tsutsumi, Fumiaki"'

1. Completion of All Nine ITER Toroidal Field Coils in Japan

Author

Nakamoto, Mio, primary, Kajitani, Hideki, additional, Hemmi, Tsutomu, additional, Takano, Katsutoshi, additional, Sakamoto, Kazuyuki, additional, Tsutsumi, Fumiaki, additional, Saito, Kengo, additional, Shimizu, Tatsuya, additional, Baba, Takashi, additional, Kasai, Yuma, additional, Isono, Takaaki, additional, and Nakahira, Masataka, additional

Published
2024
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2. Lessons learned from European and Japanese production of ITER toroidal field coils

Author

Hemmi, Tsutomu, primary, Bellesia, Boris, additional, Hasegawa, Shin, additional, Aprili, Piergiorgio, additional, Bonito-Oliva, Alessandro, additional, Boter, Eva, additional, Paz Casas, Maria, additional, Cornelis, Marc, additional, Gomikawa, Kenji, additional, Harrison, Robert, additional, Hernandez-Sanchez, Angela, additional, Iguchi, Masahide, additional, Isono, Takaaki, additional, Jimenez, Marc, additional, Kajitani, Hideki, additional, Koczorowski, Sebastien, additional, Koizumi, Norikiyo, additional, Lo Bue, Alessandro, additional, Matsui, Kunihiro, additional, Nakahira, Masataka, additional, Nakamoto, Mio, additional, Saito, Kengo, additional, Sakamoto, Kazuyuki, additional, Sakurai, Takeru, additional, Shimizu, Tatsuya, additional, Suwa, Tomone, additional, Takano, Katsutoshi, additional, Takebayashi, Keiya, additional, Tanaka, Nobuhiko, additional, Tsutsumi, Fumiaki, additional, Uno, Yasuhiro, additional, and Viladiu Martinez, Eduard, additional

Published
2024
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6. Development of Welding Deformation Control Technology for ITER TF Coil Structure

Author

IGUCHI, Masahide, primary, SAKURAI, Takeru, additional, TAKANO, Katsutoshi, additional, OHKAWA, Tatsuya, additional, TANAKA, Nobuhiko, additional, KURITA, Tomohisa, additional, TSUTSUMI, Fumiaki, additional, KOIZUMI, Norikiyo, additional, NAKAHIRA, Masataka, additional, FUJIWARA, Eiko, additional, SHICHIJYO, Takamasa, additional, TOSHIMITSU, Kazuhiro, additional, HWANG, Se-sub, additional, KIM, Sang-yong, additional, ABURA, Masakazu, additional, and HANAOKA, Toshiaki, additional

Published
2020
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7. ITER TFコイル構造物 サブ・アッセンブリの製作進捗

Author

Sakurai, Takeru, Iguchi, Masahide, Ozeki, Hidemasa, Fujiwara, Eikou, Tsutsumi, Fumiaki, Ino, Masanobu, Hong, Yunseok, Takano, Katsutoshi, Kurita, Tomohisa, Nakahira, Masataka, and Koizumi, Norikiyo

Abstract

量研機構はITER計画において19個のトロイダル磁場コイル（TFコイル）構造物の調達を担当している。2014年4月から実機TFコイル構造物製作を開始し、2017年7月には内側構造物のサブ・アッセンブリ初号機が完成し、現在、外側構造物のサブ・アッセンブリ初号機も製作大詰めを迎えている。本発表はそのサブ・アッセンブリ初号機の製作における課題と対処をはじめとしたTFコイル構造物製作の進捗について報告である。, 2017年度秋季（第95回）低温工学・超電導学会

Published
2017

8. Progress of ITER TF Coil Case Fabrication in Japan

Author

Iguchi, Masahide, primary, Sakurai, Takeru, additional, Hemmi, Tsutomu, additional, Fujiwara, Eikou, additional, Ino, Masanobu, additional, Nishino, Masao, additional, Tanaka, Nobuhiko, additional, Kanamori, Shino, additional, Kurita, Tomohisa, additional, Hanaoka, Toshiaki, additional, Hong, Yunseok, additional, Tsutsumi, Fumiaki, additional, Nakahira, Masataka, additional, and Koizumi, Norikiyo, additional

Published
2018
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10. Performance Analysis of Mass-Produced Nb3Sn Conductor for Central Solenoid in ITER

Author

Sedlak, Kamil, Stepanov, Boris, Bruzzone, Pieruigi, Suwa, Tomone, Ozeki, Hidemasa, Kajitani, Hideki, Sakurai, Takeru, Hemmi, Tsutomu, Iguchi, Masahide, Nunoya, Yoshihiko, Takahashi, Yoshikazu, Isono, Takaaki, Matsui, Kunihiro, Koizumi, Norikiyo, Tsutsumi, Fumiaki, Uno, Yasuhiro, Oshikiri, Masayuki, and Okuno, Kiyoshi

Abstract

The performance of two mass-produced Nb3Sn conductors for the ITER central solenoids was tested for the first time. One was cut from the forward end of an 80-m-long conductor, and the other was cut from the forward end of a 918-m-long conductor. The fifth-stage twist pitches of these conductors were lengthened by approximately 16% during cable insertion and compaction with conduit. The current sharing temperatures Tcs were measured over 20 000 electromagnetic cycles, including four thermal cycles between 4.2 K and room temperature. The Tcs of the former conductor increased and became almost constant through the cycling. In contrast, Tcs of the latter conductor not only increased but also decreased slightly against cycling. The Tcs decline rate after 10 002 cycles was −4.50 × 10−6 K/cycle. If this rate is assumed to continue after 20 000 cycles, Tcs would decrease by −0.27 K over 60 000 cycles. Even so, Tcs is higher than an acceptance criterion of 6.5 K at 60 000 cycles. The ac losses Q of both conductors at a current of 0 kA were almost the same as or slightly lower than Q of a short sample conductor whose fifth-stage twist pitch was not lengthen. On each conductor, Q at 40 kA was approximately 10% higher than that at 0 kA; thus, the effect of the transport current on Q was not large.

Published
2017

11. Cable Behavior During Manufacture of a 900-m Scale CICC

Author

Suwa, Tomone, primary, Nabara, Yoshihiro, additional, Takahashi, Yoshikazu, additional, Oshikiri, Masayuki, additional, Tsutsumi, Fumiaki, additional, Shibutani, Kazuyuki, additional, Nunoya, Yoshihiko, additional, Sekiguchi, Nobuo, additional, and Matsuda, Hidemitsu, additional

Published
2016
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12. Performance Analysis of Mass-Produced Nb3Sn Conductor for Central Solenoid in ITER

Author

Nabara, Yoshihiro, primary, Suwa, Tomone, additional, Ozeki, Hidemasa, additional, Kajitani, Hideki, additional, Sakurai, Takeru, additional, Hemmi, Tsutomu, additional, Iguchi, Masahide, additional, Nunoya, Yoshihiko, additional, Takahashi, Yoshikazu, additional, Isono, Takaaki, additional, Matsui, Kunihiro, additional, Koizumi, Norikiyo, additional, Tsutsumi, Fumiaki, additional, Uno, Yasuhiro, additional, Oshikiri, Masayuki, additional, Shibutani, Kazuyuki, additional, Okuno, Kiyoshi, additional, Murakami, Yukinobu, additional, Takano, Tsuyoshi, additional, Sedlak, Kamil, additional, Stepanov, Boris, additional, and Bruzzone, Pierluigi, additional

Published
2016
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13. Analysis of Internal-Tin$\hbox{Nb}_{3}\hbox{Sn}$ Conductors for ITER Central Solenoid

Author

Suwa, Tomone, primary, Nabara, Yoshihiro, additional, Ozeki, Hidemasa, additional, Hemmi, Tsutomu, additional, Isono, Takaaki, additional, Takahashi, Yoshikazu, additional, Kawano, Katsumi, additional, Oshikiri, Masayuki, additional, Tsutsumi, Fumiaki, additional, Shibutani, Kazuyuki, additional, Nunoya, Yoshihiko, additional, Okuno, Kiyoshi, additional, Sim, Ki-Hong, additional, Park, Pyeong-Yeol, additional, Jang, K., additional, Lee, Jung-seg, additional, Han, Il-Yong, additional, Kwon, Soun Pil, additional, Park, Soo-Hyeon, additional, Sedlak, Kamil, additional, Stepanov, Boris, additional, and Bruzzone, Pierluigi, additional

Published
2015
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14. Behavior of$\hbox{Nb}_{3}\hbox{Sn}$ Cable Assembled With Conduit for ITER Central Solenoid

Author

Nabara, Yoshihiro, primary, Suwa, Tomone, additional, Takahashi, Yoshikazu, additional, Hemmi, Tsutomu, additional, Kajitani, Hideki, additional, Ozeki, Hidemasa, additional, Sakurai, Takeru, additional, Iguchi, Masahide, additional, Nunoya, Yoshihiko, additional, Isono, Takaaki, additional, Matsui, Kunihiro, additional, Koizumi, Norikiyo, additional, Tsutsumi, Fumiaki, additional, Uno, Yasuhiro, additional, Oshikiri, Masayuki, additional, Shibutani, Kazuyuki, additional, Okuno, Kiyoshi, additional, Murakami, Yukinobu, additional, Takano, Tsuyoshi, additional, Sekiguchi, Nobuo, additional, and Matsuda, Hidemitsu, additional

Published
2015
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19. Behavior of \Nb3\Sn Cable Assembled With Conduit for ITER Central Solenoid.

Author

Nabara, Yoshihiro, Suwa, Tomone, Takahashi, Yoshikazu, Hemmi, Tsutomu, Kajitani, Hideki, Ozeki, Hidemasa, Sakurai, Takeru, Iguchi, Masahide, Nunoya, Yoshihiko, Isono, Takaaki, Matsui, Kunihiro, Koizumi, Norikiyo, Tsutsumi, Fumiaki, Uno, Yasuhiro, Oshikiri, Masayuki, Shibutani, Kazuyuki, Okuno, Kiyoshi, Murakami, Yukinobu, Takano, Tsuyoshi, and Sekiguchi, Nobuo

Subjects
ELECTRIC cables, SOLENOIDS, SUPERCONDUCTING coils, GEOMETRIC analysis, SUPERCONDUCTING wire
Abstract

We describe herein the characteristics of a \Nb3\Sn cable inserted into a conduit (cable-in-conduit conductor) for the International Thermonuclear Experimental Reactor toroidal field (TF) coil and central solenoid (CS). During insertion, the pulling force almost linearly increases as a function of the length li of cable is inserted. The slope of these curves for the CS cables are approximately 74% that for the TF cable, although the mass per unit length of the CS cable is approximately 63% that of the TF cable. Thus, friction between the CS cable and the conduit is slightly greater than that between the TF cable and the conduit. The number Np of rotations at the cable point for the TF cable increases to 50 almost linearly versus li. For li<150\ \m, Np for the CS cables also increases almost linearly with a slightly greater slope than for the TF cable. However, the slope decreases, and Np becomes constant at 30 for li>600\ \m. During compaction, the number Nt of rotations at the tail of the TF cable, the 613-m-long CS cable, and the 918-m-long CS cable increases almost linearly versus compacted cable length to 23, 36, and 69, respectively. The X-ray transmission imaging of the CS conductor clarifies the distributions of the fifth-stage twist pitch of the cable (lp) over the entire length of the conductor. These results are consistent with a geometric analysis based on Np and Nt. The results for lp peak at the cable point; thus, a sample of the conductor should be taken from the point to investigate how lp elongation affects conductor performance. [ABSTRACT FROM PUBLISHER]

Published
2015
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21. The SMES Model Coil. Test Results of the SMES Model Coil. DC Electromagnetic Performance.

Author

ISONO, Takaaki, primary, NUNOYA, Yoshihiko, additional, HAMADA, Kazuya, additional, MATSUI, Kunihiro, additional, SUGIMOTO, Makoto, additional, KOIZUMI, Norikiyo, additional, ITO, Toshinobu, additional, TANEDA, Masanobu, additional, WATANABE, Ikuo, additional, NOZAWA, Masanobu, additional, TERASAWA, Atsumi, additional, AZUMA, Katsunori, additional, ISHIO, Kotaro, additional, TSUTSUMI, Fumiaki, additional, HANAWA, Hiromi, additional, OSHIKIRI, Masayuki, additional, SEKI, Shuichi, additional, WAKABAYASHI, Hiroshi, additional, TAKANO, Katsutoshi, additional, UNO, Yasuhiro, additional, KATO, Takashi, additional, NAKAJIMA, Hideo, additional, TAKAHASHI, Yoshikazu, additional, ANDO, Toshinari, additional, TSUJI, Hiroshi, additional, HAMAJIMA, Takataro, additional, ONO, Michitaka, additional, NAKAMOTO, Kazunari, additional, HANAI, Satoshi, additional, WACHI, Yoshihiro, additional, SHINODA, Kimiyuki, additional, MINEMURA, Toru, additional, SATO, Hiromichi, additional, FUJIBAYASHI, Kazuo, additional, HIMENO, Takashi, additional, TAKANO, Ichiro, additional, and SATOW, Takashi, additional

Published
1998
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22. Installation and Test Programme of the ITER Poloidal Field Conductor Insert (PFCI) in the ITER Test Facility at JAEA Naka.

Author

Nunoya, Yoshihiko, Takahashi, Yoshikazu, Hamada, Kazuya, Isono, Takaaki, Matsui, Kunihiro, Oshikiri, Masayuki, Nabara, Yoshihiro, Hemmi, Tsutomu, Nakajima, Hideo, Kawano, Katsumi, Tsutsumi, Fumiaki, Takano, Katsutoshi, Uno, Yasuhiro, Koizumi, Norikiyo, Okuno, Kiyoshi, Baker, William, Salpietro, Ettore, Rajainmaki, Hannu, Sborchia, Carlo, and Mitchell, Neil

Subjects
ELECTRICAL conductors, MAGNETIC circuits, SUPERCONDUCTIVITY, JOINTS (Engineering)
Abstract

ITER PFCI has been manufactured in the Europe and installed into the ITER Test Facility in Naka, Japan. The conductor is NbTi cable-in-conduit conductor with thick square stainless steel jacket and almost identical with the design of the ITER PF coils. The main objective of this test is the characterization of the conductor and joints at the conditions relevant to the ITER PF coil operation. Intermediate joint is located in the winding at relatively high field to examine its performance. The main items in the PFCI test program are thermo-hydraulic test, DC mode test, cyclic test and pulse mode test. The PFCI and CSMC were successfully cooled down to cryogenic temperature within 450 hours. The test of the PFCI was performed from May to August 2008. The key technology of the installation, the test methods and procedures, and some preliminary results of cool-down are described in this paper. [ABSTRACT FROM AUTHOR]

Published
2009
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23. Demonstration of JK2LB Jacket Fabrication for ITER Central Solenoid.

Author

Hamada, Kazuya, Nakajima, Hideo, Kawano, Katsumi, Takano, Katsutoshi, Tsutsumi, Fumiaki, Seki, Syuichi, Okuno, Kiyoshi, Fujitsuna, Nobuyuki, and Mizoguchi, Mitsuru

Subjects
FUSION reactors, SOLENOIDS, SUPERCONDUCTORS, ENERGY research, RESEARCH institutes
Abstract

The Japan Atomic Energy Research Institute developed a jacket material called JK2LB (0.03C–22Mn-13Cr-9Ni-1Mo-0.2N-B) for the Central Solenoid (CS) conductor in the International Thermonuclear Experimental Reactor (ITER). To demonstrate production feasibility of CS conductor jacket, trial fabrication of a full size jacket using hot extrusion followed by cold drawing of the JK2LB billets was performed. As a result of dimensional measurement, the ITER dimensional requirement for circle-in-square jacket has been achievable. We achieved the requirement of 0.2 % yield strength >1000 MPa and KIC(J) ≥ 130 MPa√m for solution treated + aged jacket. It has been observed that applied cold work strongly affects the toughness of jacket before and after aging. We estimate that C and N reduction will be required to achieve the required strength and fracture toughness for ITER CS jacket. The fabrication R&D has prepared us for mass production of jacket for the ITER CS conductor procurement. [ABSTRACT FROM AUTHOR]

Published
2006
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24. Influence of Indentation on the Critical Current of Nb3Sn Strands

Author

Nunoya Yoshihiko, Soun Pil Kwon, Miyashita Katsumi, Oshikiri Masayuki, Takahashi Yoshikazu, Shibutani Kazuyuki, Suwa Tomone, Murakami Yukinobu, Nabara Yoshihiro, Tsutsumi Fumiaki, and Ki-Hong Sim

Subjects
Superconductivity, Materials science, Critical depth, Solenoid, Physics and Astronomy(all), deformation before heat treatment, Current sharing, Indentation, ITER, Critical current, Twist, Composite material, Nb3Sn strand, Electrical conductor, critical current, degradation
Abstract

The Japan Atomic Energy Agency (JAEA) is procuring Central Solenoid (CS) conductorsfor all modules forITER. The superconducting properties of the Nb 3 Sn CS conductors will have to sustain 60,000 electromagnetic (EM) cycles. The current sharing temperatures ( T cs ) were stable with EM cycles in short twist pitch conductors.However, the short twist pitch and tight cabling increases indented strands at the contact point between strands before heat treatment. The results of I c measurement on artificially indented Nb 3 Sn strands indicate that I c was almost constant within a critical depth of the indentations.

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25. Performance Analysis of Mass-Produced Nb3Sn Conductor for Central Solenoid in ITER

Author

Nabara, Yoshihiro, Tomone, Suwa, Ozeki, Hidemasa, Kajitani, Hideki, Sakurai, Takeru, Hemmi, Tsutomu, Iguchi, Masahide, Nunoya, Yoshihiko, Takahashi, Yoshikazu, Isono, Takaaki, Matsui, Kunihiro, Koizumi, Norikiyo, Tsutsumi, Fumiaki, Uno, Yasuhiro, Oshikiri, Masayuki, Shibutani, Kazuyuki, Okuno, Kiyoshi, Murakami, Yukinobu, Takano, Tsuyoshi, Sedlak, Kamil, Stepanov, Boris, and Bruzzone, Pierluigi

Subjects
electromagnetic, insertion and compaction with conduit, central solenoid, ITER, temperature, conductors
Abstract

The performance of two mass-produced Nb3Sn conductors for the ITER central solenoids was tested for the first timmass-produced Nb3Sn conductorse. One was cut from the forward end of an 80-m-long conductor, and the other was cut from the forward end of a 918-m-long conductor. The fifth-stage twist pitches of these conductors were lengthened by approximately 16% during cable insertion and compaction with conduit. The current sharing temperatures Tcs were measured over 20 000 electromagnetic cycles, including four thermal cycles between 4.2 K and room temperature. The Tcs of the former conductor increased and became almost constant through the cycling. In contrast, Tcs of the latter conductor not only increased but also decreased slightly against cycling. The Tcs decline rate after 10002 cycles was -4.50 × 10-6 K/cycle. If this rate is assumed to continue after 20000 cycles, Tcs would decrease by -0.27 K over 60000 cycles. Even so, Tcs is higher than an acceptance criterion of 6.5 K at 60 000 cycles. The ac losses Q of both conductors at a current of 0 kA were almost the same as or slightly lower than Q of a short sample conductor whose fifth-stage twist pitch was not lengthen. On each conductor, Q at 40 kA was approximately 10% higher than that at 0 kA; thus, the effect of the transport current on Q was not large.

26. Analysis of Internal-Tin Nb3Sn Conductors for ITER Central Solenoid

Author

Suwa, Tomone, Nabara, Yoshihiro, Ozeki, Hidemasa, Hemmi, Tsutomu, Isono, Takaaki, Takahashi, Yoshikazu, Kawano, Katsumi, Oshikiri, Masayuki, Tsutsumi, Fumiaki, Shibutani, Kazuyuki, Nunoya, Yoshihiko, Okuno, Kiyoshi, Sim, Ki-Hong, Park, Pyeong-Yeol, Jang, K., Lee, Jung-Seg, Han, Il-Yong, Kwon, Soun Pil, Park, Soo-Hyeon, Sedlak, Kamil, Stepanov, Boris, and Bruzzone, Pierluigi

Subjects
ITER Central Solenoid conductors electromagnetic JAEA cables warm-up/cooldowns jacket measurement
Abstract

Japan Atomic Energy Agency (JAEA) is procuring 100% of the ITER Central Solenoid (CS) conductors. The CS conductor is required to maintain the performance under 60000 pulsed electromagnetic cycles. JAEA tested two internal-tin Nb3Sn conductors for the CS at the SULTAN test facility. As a result of destructive examination, the twist pitches of both of the cables satisfied requirements of the ITER Organization (IO). The current sharing temperatures Tcs of each sample were 6.6 and 6.8 K before cyclic operation, and the Tcs values were 6.8 and 6.9 K after 9700 electromagnetic cycles, including three warm-up/cooldowns, respectively. The Tcs performance of both samples satisfied the IO requirement. The ac losses of CSKO1-C and CSKO1-D were approximately half of typical bronze-route CS conductors at 2 and 9 T. The ac loss at 45.1 kA after the cycling was 1.5 times higher than that without the transport current. An almost constant strain of the jacket was observed after the test as a result of the residual strain measurement. Therefore, the deformation of the cable might have been homogeneous along the conductor axis. Because of the higher Tcs of CSKO1-D than CSKO1-C, JAEA started the manufacturing of the CS conductor with the same specification as CSKO1-D.

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