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Dive into the research topics where Y.K. Shibama is active.

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Featured researches published by Y.K. Shibama.


Plasma Science & Technology | 2013

Design Study of Top Lid with Clamp Structure in JT-60SA Cryostat

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

Manufacturing Status of JT-60SA Vacuum Vessel and the Related Technology of Welding

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

Status of JT-60SA tokamak under the EU-JA Broader Approach Agreement

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

JT-60SA vacuum vessel manufacturing and assembly

K. Masaki; Y.K. Shibama; S. Sakurai; Kiyoshi Shibanuma; Akira Sakasai


Fusion Engineering and Design | 2013

Assembly study for JT-60SA tokamak

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

Safety design of radiation shielding for JT-60SA

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

Fundamental welding R&D results for manufacturing vacuum vessel of JT-60SA

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

Structural analysis of the JT-60SA cryostat vessel body

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

Design of lower divertor for JT-60SA

S. Sakurai; S. Higashijima; T. Hayashi; Y.K. Shibama; H. Masuo; Hidetsugu Ozaki; Akira Sakasai; Kiyoshi Shibanuma


symposium on fusion technology | 2009

Mock-up test results of monoblock-type CFC divertor armor for JT-60SA

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

Collaboration


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K. Masaki

Japan Atomic Energy Research Institute

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Akira Sakasai

Japan Atomic Energy Agency

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S. Sakurai

Japan Atomic Energy Agency

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Kiyoshi Shibanuma

Japan Atomic Energy Research Institute

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A. Sakasai

Japan Atomic Energy Research Institute

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Esther Rincon

Complutense University of Madrid

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J. Botija

Complutense University of Madrid

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M. Medrano

Complutense University of Madrid

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Makoto Matsukawa

Japan Atomic Energy Agency

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Alfonso Soleto

Complutense University of Madrid

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