Design and manufacturing of thermal shield for JT-60SA
| Autor: | J. Yagyu, Akira Sakasai, Shigetoshi Nakamura, Kei Masaki, Go Matsunaga, Yusuke Shibama, Koji Kamiya, Shinji Sakurai, Fuminori Okano |
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| Rok vydání: | 2019 |
| Předmět: |
Cryostat
Materials science Toroid Mechanical Engineering Nuclear engineering Seismic loading 01 natural sciences 010305 fluids & plasmas law.invention Nuclear Energy and Engineering law Thermal radiation Mechanical joint Shield 0103 physical sciences Thermal Eddy current General Materials Science 010306 general physics Civil and Structural Engineering |
| Zdroj: | Fusion Engineering and Design. 146:2375-2378 |
| ISSN: | 0920-3796 |
| DOI: | 10.1016/j.fusengdes.2019.03.194 |
| Popis: | The thermal shield (TS) of JT-60SA which is a superconducting tokamak, is installed to reduce radiation heat load from a vacuum vessel (VV), a cryostat vessel and ports at ambient temperature to superconducting coils at 4 K. The TS is double walled structure with He cooling pipe at 80 K, and is divided electrically in toroidal direction and poloidal direction to suppress eddy currents flowing through the TS during disruption. The TS is required to be installed in a narrow space which is between the VV, the ports, and the superconducting coils. Manufacturing and assembly accuracy of the TS are required to ensure the sufficient space for the relative displacement caused by thermal displacement and seismic load. Customization of mechanical joints in the divided section of the TS is effective process for keeping the required accuracy. Assembly of 340 ° sector of the vacuum vessel thermal shield has been completed. |
| Databáze: | OpenAIRE |
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