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内容記述 |
In Japan, National Institutes for Quantum Science and Technology (QST) has responsibility to develop nine Toroidal Field (TF) coils, each of which mainly consists of a winding pack (WP) and a coil case, for ITER project. The WP consists of seven conductors inserted into each D-shaped radial plate (RP), so called double-pancakes. Although the size of a WP is quite large as about 14 m in height and 9 m in width, position of current center line (CCL) of the WP should be controlled within a few milli-meters. Therefore, many technical challenges arose especially in RP and insulation manufacturing process. In the former, by optimizing welding and machining procedures, accurate manufacturing techniques were established. Then, All of RPs were fabricated within errors of about 1 mm from the nominal. For the latter, by developing a method to insulate a WP while applying compression, accuracy of the dimensions were achieved within errors of a few milli-meters in all of WPs. As results, all of nine WPs were successfully completed for TF coils in Japan in March 2022. |
