Plasma and Fusion Research

Volume 16, 2405036 (2021)

Regular Articles

Study on Assembly of TF Coil and Vacuum Vessel for Fusion DEMO
National Institute for Fusion Science, Toki 509-5292, Japan
Technical Institute of Physics and Chemistry, China
(Received 4 November 2020 / Accepted 1 February 2021 / Published 5 March 2021)


ITER is in the integration phase and a fusion DEMO is being designed conceptually. The size of the DEMO will be around 1.5 time larger than the ITER and the weight will be about three times larger than the ITER. The TF coil and the vacuum vessel of the DEMO will become very heavy and extremely large. Although the central support structure will be used in the ITER for the assembly of TF coils and vacuum vessels, the central cylinder concept is proposed in this study to avoid the huge concentrated load at the center of the device floor during assembly. In addition, the welding joint between the vacuum vessels is discussed under the limited conditions supposed on the DEMO. Since the vacuum vessel will become the nuclear boundary, all weld lines will be expected to be examined by ultrasonic testing and/or radiographic testing to ensure the soundness of the welds.


fusion DEMO, TF coil, vacuum vessel, central cylinder concept, weld joint, non-destructive inspection

DOI: 10.1585/pfr.16.2405036


  • [1] ITER web site,
  • [2]
  • [3] K. Tobita et al., Fusion Sci. Technol. 72, 537 (2017).
  • [4]
  • [5] Y.K. Shibama et al., Plasma Fusion Res. 9, 180 (2010).