Completion of the First ITER TF Coil in the Second Manufacturing Line in Japan

In Japan, 9 ITER TF coils for Japan and 10 TF coil cases (CCs) for EU are procured from two suppliers. In the second manufacturing line (ML), some of manufacturing procedures were optimized and/or rationalized from lessons learned from the experiences in the first ML. These efforts contributed to simplification and acceleration of the fabrication of the ITER TF coil in the second ML and then, the first ITER TF coil has been completed in May 2021 in the second ML. In addition, the most challenging processes in TF coil fabrication such as very accurate current center line positioning and proper gap between a winding pack (WP) and CC, more than 4 mm were achieved in assembly of WP and CC, as well as the first ML. These results justified the validity of the optimized and rationalized manufacturing procedure in the second ML. Therefore, we can say that manufacturing in both first and second MLs in Japan has become stable. Actually, four and two TF coils have been completed in the first and second MLs in Japan, respectively.