Progress of ITER TF Coil Case Fabrication in Japan

将秀, 井口; 武尊, 櫻井; 努, 辺見; 英弘, 藤原; 昌信, 猪野; 雅夫, 西野; 信彦, 田中; 信乃, 金森; 智久, 栗田; 敏成, 花岡; 胤碩, 洪; 史明, 堤; 昌隆, 中平; 徳潔, 小泉

doi:10.1109/tasc.2017.2784827

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…Segment-to-segment welding proved the most difficult because unlike flat plate welding, the complex U-shape makes angular distortion difficult to estimate. JADA performed a segment-to-segment (A1+A2) welding trial, and the amount of welding deformation and tendency of the welding direction were determined [13,14]. Figure 5 shows an example of the segment-to-segment welding configuration using controlled deformation.…”

Section: Challenge (Iii): Welding Deformation Controlmentioning

confidence: 99%

Completion of the first ITER toroidal field coil structure

et al. 2019

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Section: Challenge (Iii): Welding Deformation Controlmentioning

confidence: 99%

Completion of the first ITER toroidal field coil structure

et al. 2019

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“…The ITER magnet system has 18 Toroidal Field (TF) coils for plasma confinement. National Institutes for Quantum Science and Technology (QST), as the Japan Domestic Agency (JADA), is responsible for the procurement of 9 ITER TF coils and 19 TF coil cases (CCs) [1][2][3][4][5][6]. Figure 1 illustrates a winding pack (WP) and CC of the TF coil.…”

Section: Introductionmentioning

confidence: 99%

A Double Check Process for CCL Positional Plates in ITER TF Coil Integration

HASEGAWA

TSUTSUMI

SAITO

et al. 2023

Plasma and Fusion Research

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A current center line (CCL) was precisely controlled with markers called "CCL positional plates (CCLPPs)" during the ITER toroidal filed (TF) coil integration. CCLPPs with the same x and y coordinates (CCLPP pair) are attached on both sides of the TF coil Winding Pack (WP). The CCLPP insufficiently fixed has to be replaced with new one to ensure the accuracy of CCL. On the other hand, the replacement possibly leads to some issues, such as, dropping the CCLPP into the CC and damaging the WP. Thus, unnecessary replacement should be avoided. We have therefore implemented a double check process to confirm soundness of the CCLPPs. First, change of the distance of CCLPP pair (∆W CCLPP ) is evaluated (Check A). However, ∆W CCLPP would be influenced by the WP deformation. Thus, the Check A possibly judges the fixing condition of the CCLPP as "unusual" even if it has no issue. This may lead to the unnecessary replacement of the CCLPP. To avoid the unnecessary replacement, the local displacement of each CCLPPs (∆r CCLPP ) is also evaluated (Check B). In this paper, we define the criteria for "unusual" ∆W CCLPP and ∆r CCLPP based and verify its validity for the TF coil integration by considering the measurement error and geometrical configuration of the CCLPPs. In the case of one Toshiba TF coil, the double check process confirmed that CCLPPs were insufficiently fixed, and they were successfully replaced to the new ones. Thus, it was demonstrated that the proposed criteria indicated the appropriate action to keep the CCLPP soundness. The method proposed in this paper would be powerful tool to inspect the soundness of the CCLPP which is important for the CCL control not only in the ITER TF coil, but also in the future fusion magnets.

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