Plasma and Fusion Research

Volume 18, 2405009 (2023)

Regular Articles

Completion of all Winding Packs for ITER Toroidal Field Coils in Japan
Hideki KAJITANI, Mio NAKAMOTO, Tomone SUWA, Katsutoshi TAKANO, Yasuhiro UNO, Masataka NAKAHIRA and Takaaki ISONO
National Institutes for Quantum Science and Technology, Naka 311-0193, Japan
(Received 16 December 2022 / Accepted 17 January 2023 / Published 24 February 2023)

Abstract

In Japan, National Institutes for Quantum Science and Technology (QST) has the responsibility to develop nine toroidal field (TF) coils, each of which consists of a winding pack (WP) and coil case for the ITER project. The WP consists of seven double-pancakes (DPs), which consist of conductors inserted into D-shaped radial plates (RPs). Although a WP is significantly large (14 m high and 9 m wide), the position of the current center line of the WP must be controlled within a few millimeters. Therefore, numerous technical challenges arose in DP and WP manufacturing. Herein, in the RP manufacturing, the optimization of welding and machining procedures, and accurate manufacturing techniques were established. Subsequently, all RPs were fabricated around the flatness errors of 1 mm from the nominal. In cover plate (CP) welding, the welding procedure was optimized so that a good DP flatness after CP welding was achieved. In the WP insulation, by developing a method to insulate a WP while applying compression, the dimensions within errors of a few milli-meters is achieved in all of WPs. Consequently, all nine WPs were successfully completed for TF coils in Japan in March 2022.

Keywords

ITER, TF coil, winding pack, radial plate, insulation, current center line

DOI: 10.1585/pfr.18.2405009

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