Speaker
Hideki Kajitani
(ITER department)
Description
Japan Atomic Energy Agency (JAEA), as Japan Domestic Agency, has responsibility to procure 9 ITER Toroidal Field (TF) coils. JAEA completed proto double-pancake (DP) trials aiming at qualification and optimization of manufacturing procedure of TF coil in 2015. Series production of DPs then started and winding of 14 DPs, heat treatment of 11 DPs, fabrication of 9 radial plates (RP), transfer of 7 DPs and cover plate (CP) welding of 4 DPs were completed until Feb. 2016. Challenging tight tolerances in conductor length, +/-0.01%, was achieved to transfer heat-treated conductor into RP groove. 1 mm flatness was achieved in RP, whose height and width are 13 m and 9 m. In addition, about 2 mm flatness was achieved after CP welding by optimizing welding sequence. The first DP insulation was completed and preparation of DP impregnation is underway. It is important to achieve good flatness, such as 2 mm, after impregnation of DP in order to simplify stacking process of DPs to form winding pack (WP). In the proto DP impregnation, about 2 mm flatness was successfully achieved by compensating out-of-plane deformation of DP after CP welding.
Co-authors
Hideki Kajitani
(ITER department, Japan Atomic Energy Agency, Ibaraki, Japan)
Norikiyo Koizumi
(ITER department, Japan Atomic Energy Agency, Ibaraki, Japan)
