Design and thermal analysis of JT-60SA thermal shield

Kamiya, Koji; Takenouchi, Tadashi; Ichige, Toshikatsu; Yoshida, Kiyoshi

JT-60SA, which is planned to use superconducting magnets for plasma confinment, will use a thermal shield cooled at 80K as a radiation shield for 4K magnets. Therefore, the shape of the thermal shield strongly depends on the shape of the superconducting magnets. The specification and the shape of the toroidal field coil has been fixed this year, and 110 mm clearance between plasma vacuum vessel and the magnets has been acquired. In the present publication, the thermal shield has been designed in the 110 mm clearance and the thermal analysis has been conducted for a part of it.