Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Tamii, Atsushi*; Pellegri, L.*; Sderstr
m, P.-A.*; Allard, D.*; Goriely, S.*; Inakura, Tsunenori*; Khan, E.*; Kido, Eiji*; Kimura, Masaaki*; Litvinova, E.*; et al.
European Physical Journal A, 59(9), p.208_1 - 208_21, 2023/09
Times Cited Count:3 Percentile:69.58(Physics, Nuclear)no abstracts in English
Shimizu, Yusei*; Haga, Yoshinori; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*
Physical Review B, 93(2), p.024502_1 - 024502_8, 2016/01
Times Cited Count:8 Percentile:35.71(Materials Science, Multidisciplinary)Shimizu, Yusei*; Haga, Yoshinori; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*; Aoki, Dai*; Brison, J.-P.*; Braithwaite, D.*
JPS Conference Proceedings (Internet), 3, p.015009_1 - 015009_6, 2014/06
Shimizu, Yusei*; Haga, Yoshinori; Ikeda, Yoichi*; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*
Physical Review Letters, 109(21), p.217001_1 - 217001_5, 2012/11
Times Cited Count:18 Percentile:67.74(Physics, Multidisciplinary)Koizumi, Norikiyo; Matsui, Kunihiro; Shimizu, Tatsuya; Nakajima, Hideo; Iijima, Ami*; Makino, Yoshinobu*
Teion Kogaku, 47(3), p.186 - 192, 2012/03
In the ITER TF coil, cover plates (CP) are welded to teeth of a radial plate (RP) to fix a conductor in the groove of the RP. Though total length of welds is approximately 1.5 km and height and width of an RP are 14 m and 9 m, respectively, the welding deformation better than 1 mm in local distortion and several milli-meters in in-plane deformation is required. Therefore, laser welding is used for the CP welding to reduce welding deformation as possible. However, a gap of a welding joint is expected to be 0.5 mm at the maximum. Therefore, at first, the laser welding technique to enable welding on the gap of 0.5 mm width is developed in this study. Using this technology, CP welding trial using an RP mock was successfully performed. The achieved flatness is 0.6 mm. In addition, the welding deformation of a full-scale RP is estimated by the analysis using the inherent strain. The results show that the flatness of 1 mm is achievable and profile of 5 mm can be achieved. Since the in-plane deformation can be corrected by welding somewhere to originate artificial welding deformation, it is confident that the required tolerance of several milli-meters in in-plan profile is achievable.
Takano, Katsutoshi; Koizumi, Norikiyo; Shimizu, Tatsuya; Nakajima, Hideo; Esaki, Koichi*; Nagamoto, Yoshifumi*; Makino, Yoshinobu*
Teion Kogaku, 47(3), p.178 - 185, 2012/03
In the ITER TF coil, the tight tolerances of 1 mm in flatness and a few mm in profile are required in manufacturing a radial plate (RP), although the height and width of an RP are 13 m and 9 m, respectively. In addition, since cover plates (CP) should be fitted to a groove of an RP with tolerance of 0.5 mm, the tight tolerances are also required to a CP. Thus, we can conclude that the manufacturing procedure of the RP and CP has been demonstrated.
Shimizu, Yusei*; Ikeda, Yoichi*; Wakabayashi, Takumi*; Haga, Yoshinori; Tenya, Kenichi*; Hidaka, Hiroyuki*; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*
Journal of the Physical Society of Japan, 80(9), p.093701_1 - 093701_4, 2011/09
Times Cited Count:8 Percentile:49.89(Physics, Multidisciplinary)Shimizu, Yusei*; Ikeda, Yoichi*; Wakabayashi, Takumi*; Tenya, Kenichi*; Haga, Yoshinori; Hidaka, Hiroyuki*; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*
Journal of the Physical Society of Japan, 80(Suppl.A), p.SA100_1 - SA100_3, 2011/07
Times Cited Count:1 Percentile:11.07(Physics, Multidisciplinary)Shimizu, Yusei*; Ikeda, Yoichi*; Wakabayashi, Takumi*; Tenya, Kenichi*; Haga, Yoshinori; Hidaka, Hiroyuki*; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*
Journal of Physics; Conference Series, 273, p.012084_1 - 012084_4, 2011/02
Times Cited Count:3 Percentile:62.00(Physics, Condensed Matter)Omori, Junji; Koizumi, Norikiyo; Shimizu, Tatsuya; Okuno, Kiyoshi; Hasegawa, Mitsuru*
JAEA-Technology 2009-046, 60 Pages, 2009/09
In the winding pack (WP) of the ITER TF coil, cover plates (CPs) are welded to radial plate (RP) after placing the conductors into the RP groove to fix it. The dimensions of the RP are 15 m high and 9 m wide, while its required tolerances are very severe such as flatness of 2 mm and in-plane deformation of about 2.5 mm. It is therefore necessary to reduce the deformation of the RP by CP welding. In order to estimate the weld deformation, a 1 m RP mock-up was fabricated and weld deformations were measured. From the test results, inherent strains have been obtained and the weld deformations of the full scale RP have been estimated. The RP deformations could be within the tolerances by the CP welding thickness of 2.5 mm in inboard region and 1.0 mm in outboard region. In addition, an alternative design, which improve the fabricability of the WP, was proposed. The analyses for the alternative design is performed and the results show the deformations could be reduced more.
Nakajima, Hideo; Hamada, Kazuya; Okuno, Kiyoshi; Abe, Kanako*; Shimizu, Tatsuya; Kakui, Hideo*; Yamaoka, Hiroto*; Maruyama, Naoyuki*; Takayanagi, Tadatoshi*
Fusion Engineering and Design, 82(5-14), p.1473 - 1480, 2007/10
Times Cited Count:7 Percentile:46.35(Nuclear Science & Technology)no abstracts in English
Tsuji, Hiroshi; Okuno, Kiyoshi*; Thome, R.*; Salpietro, E.*; Egorov, S. A.*; Martovetsky, N.*; Ricci, M.*; Zanino, R.*; Zahn, G.*; Martinez, A.*; et al.
Nuclear Fusion, 41(5), p.645 - 651, 2001/05
Times Cited Count:58 Percentile:83.28(Physics, Fluids & Plasmas)no abstracts in English
Matsui, Kunihiro; Koizumi, Norikiyo; Hemmi, Tsutomu; Takano, Katsutoshi; Chida, Yutaka; Shimizu, Tatsuya; Nakajima, Hideo
no journal, ,
no abstracts in English
Shimizu, Raiki*; Xu, X.*; Ito, Tatsuya; Gong, W.; Harjo, S.; Omori, Toshihiro*; Kainuma, Ryosuke*
no journal, ,
no abstracts in English
Hase, Takashi*; Shimizu, Tatsuya; Hemmi, Tsutomu; Matsui, Kunihiro; Koizumi, Norikiyo; Takahashi, Yoshikazu; Okuno, Kiyoshi
no journal, ,
NbSn conductors (40 kA, 13 T) are employed in ITER CS. The characteristics of the sample in which two kinds of conductors are connected with OFC blocks will be evaluated. The joint part will be exposed to fields widely ranging from 0.29-8.4 T when an external field of 11 T is generated. Therefore, current distribution due to the magnetic resistance may bring incorrect evaluation of performance of the sample. The current distribution in the joint part of the conductor has been analyzed with the FEM to confirm the speculation and to get an idea for make the current distribution more uniformly. It has been found as a result that the current distribution in the conventional joint structure employing the OFC with a RRR of 100 leads to a current density ratio of 1.65, though a total resistance is very low. On the contrary, by employing copper plate of RRR = 4, the current density ratio can be reduced to 1.23, while keeping the total resistance below 2 n
.
Koizumi, Norikiyo; Nakajima, Hideo; Matsui, Kunihiro; Takano, Katsutoshi; Hemmi, Tsutomu; Omori, Junji; Shimizu, Tatsuya; Okuno, Kiyoshi
no journal, ,
no abstracts in English
Onodera, Osamu*; Iguchi, Masahide*; Saito, Masakatsu*; Hamada, Kazuya; Nakajima, Hideo; Okuno, Kiyoshi; Sugimoto, Makoto; Nakahira, Masataka; Kitamura, Kazunori; Takayanagi, Tadatoshi*; et al.
no journal, ,
no abstracts in English