Y.K. Shibama
Japan Atomic Energy Agency
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Publication
Featured researches published by Y.K. Shibama.
Plasma Science & Technology | 2013
Shigetoshi Nakamura; Y.K. Shibama; K. Masaki; A. Sakasai
JT-60SA is a fully superconducting coil tokamak upgraded from the JT-60U. This paper focused on the integrity of the top lid of cryostat in JT-60SA. The design requirement for the cryostat in normal operations is to achieve vacuum insulation of 10−3 Pa, and the top flange of the top lid is lightly welded onto its body flange. The weld is tensile-loaded by bending deformation of the top lid due to vacuum pressure of external 0.1 MPa. This weld integrity is evaluated with tensile-load reduction, which results in clamp reinforcement. The structural integrity of the top lid is validated.
ASME 2011 Pressure Vessels and Piping Conference: Volume 1 | 2011
Y.K. Shibama; K. Masaki; S. Sakurai; Kiyoshi Shibanuma; Akira Sakasai
JT-60SA is a fully superconducting coil tokamak upgraded from the JT-60U, and this paper focuses on the vacuum vessel (VV, 150 tons) design concept with the related technology of welding and its manufacturing status. The design concept is developed from the ASME Boiler and Pressure Vessel Code Section VIII Division 2, and the damage tolerant concept is adopted into the welding part hardly inspected. These weld joints are treated as a partial penetration and residual strength is evaluated in the design process. Consequently, accuracy of VV weld structure is enhanced due to reduction of the welding heat input and also less process of weld work is achieved. The vacuum vessel has been manufactured since Nov. 2009. Welding technology related to the VV is surveyed and developed in three stages; element test, 1-m size trail and 20-degree upper half mock-up manufacture. The welding methodologies are selected from element tests, and then the typical vessel segments as a 1-m size are tested. The welding conditions to control its quality and the distortion are evaluated, and the lower heat input condition is additionally researched. On the basis of these results, the manufacturing sequences are established through the large size trial of the mock-up manufacturing.© 2011 ASME
Fusion Engineering and Design | 2008
Makoto Matsukawa; M. Kikuchi; Tsuneyuki Fujii; T. Fujita; T. Hayashi; S. Higashijima; N. Hosogane; Yujiro Ikeda; S. Ide; S. Ishida; Y. Kamada; Haruyuki Kimura; K. Kizu; Kenichi Kurihara; G. Kurita; K. Masaki; G. Matsunaga; N. Miya; Shinichi Moriyama; Akira Sakasai; S. Sakurai; Y.K. Shibama; Katsuhiro Shimada; Atsuhiko M. Sukegawa; T. Suzuki; Y. Suzuki; Y. Takase; M. Takechi; H. Tamai; Kunihiko Tsuchiya
Fusion Engineering and Design | 2012
K. Masaki; Y.K. Shibama; S. Sakurai; Kiyoshi Shibanuma; Akira Sakasai
Fusion Engineering and Design | 2013
Kiyoshi Shibanuma; T. Arai; Koichi Hasegawa; Ryo Hoshi; K. Kamiya; H. Kawashima; H. Kubo; K. Masaki; H. Saeki; S. Sakurai; S. Sakata; Akira Sakasai; H. Sawai; Y.K. Shibama; Kunihiko Tsuchiya; N. Tsukao; J. Yagyu; K. Yoshida; Y. Kamada; S. Mizumaki; A. Hayakawa; H. Takigami; P. Barabaschi; S. Davis; M. Peyrot; G. Phillips
symposium on fusion technology | 2007
Atsuhiko M. Sukegawa; S. Sakurai; K. Masaki; K. Kizu; Kunihiko Tsuchiya; Y.K. Shibama; T. Hayashi; H. Tamai; Makoto Matsukawa
Fusion Engineering and Design | 2011
Shiro Asano; Toshihisa Okuyama; Toshiwo Oonawa; Yutaka Yanagi; Mitsuru Ejiri; Toshio Kanahara; Koji Ichihashi; Atsushi Kikuchi; S. Mizumaki; K. Masaki; Y.K. Shibama; Masahiro Katayama; Akira Sakasai
Fusion Engineering and Design | 2013
J. Botija; Javier A. Alonso; P. Fernández; M. Medrano; Francisco Javier Sánchez-Palencia Ramos; Esther Rincon; Alfonso Soleto; S. Davis; Enrico Di Pietro; V. Tomarchio; K. Masaki; Akira Sakasai; Y.K. Shibama
Fusion Engineering and Design | 2010
S. Sakurai; S. Higashijima; T. Hayashi; Y.K. Shibama; H. Masuo; Hidetsugu Ozaki; Akira Sakasai; Kiyoshi Shibanuma
symposium on fusion technology | 2009
S. Higashijima; S. Sakurai; S. Suzuki; Kenji Yokoyama; Y. Kashiwa; K. Masaki; Y.K. Shibama; M. Takechi; Kiyoshi Shibanuma; Akira Sakasai; Makoto Matsukawa; M. Kikuchi