Design and trial manufacturing of JT-60SA thermal shield

Kamiya, Koji; Ichige, Toshikatsu; Yoshida, Kiyoshi

JT-60SA, which plans to replace all coils for the plasma confinement with superconductor, needs to enclose the superconducting coils with the thermal shield in order to reduce the radiation heat load from the ambient temperature. The thermal shield on the plasma vacuum vessel side (VVTS) requires the manufacturing and assembly torelance with high accuracy due to the narrow space between the toroidal field coil and the VVTS. Therefore, it is important to determine the manufacturing torelance from the trial manufacturing for the VVTS design. In this talk, the results including the VVTS manufacturing torelance determined from the trial manufacturing are presented.