Design and manufacturing of thermal shield for JT-60SA

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 divi...

Full description

Saved in:
Bibliographic Details
Published inFusion engineering and design Vol. 146; pp. 2375 - 2378
Main Authors Nakamura, Shigetoshi, Shibama, Yusuke, Sakurai, Shinji, Yagyu, Junnichi, Okano, Fuminori, Kamiya, Koji, Matsunaga, Go, Masaki, Kei, Sakasai, Akira
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.09.2019
Elsevier Science Ltd
Subjects
Ambient temperature
Assembly
Clearance
Coils
Coupler
Disruption
Earthquake loads
Eddy currents
JT-60SA
On-site assembly
Ports
Positioning
Seismic engineering
Superconductivity
Thermal shield
Tokamak devices
Vessels
Positioning
Coupler
Thermal shield
Clearance
JT-60SA
On-site assembly
Online AccessGet full text

Cover

More Information
Summary: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.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2019.03.194