Behavior of [Formula Omitted] Cable Assembled With Conduit for ITER Central Solenoid

• Published in: IEEE transactions on applied superconductivity 2015-06, Vol.25 (3), p.1
• Main Authors: Nabara, Yoshihiro, Suwa, Tomone, Takahashi, Yoshikazu, Hemmi, Tsutomu, Kajitani, Hideki, Ozeki, Hidemasa, Sakurai, Takeru, Iguchi, Masahide, Nunoya, Yoshihiko, Isono, Takaaki, Matsui, Kunihiro, Koizumi, Norikiyo, Tsutsumi, Fumiaki, Uno, Yasuhiro, Oshikiri, Masayuki, Shibutani, Kazuyuki, Okuno, Kiyoshi, Murakami, Yukinobu, Takano, Tsuyoshi, Sekiguchi, Nobuo, Matsuda, Hidemitsu
• Format: Article
• Language: English
• Subjects: Cables
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2014.2360562

We describe herein the characteristics of a [Formula Omitted] cable inserted into a conduit (cable-in-conduit conductor) for the International Thermonuclear Experimental Reactor toroidal field (TF) coil and central solenoid (CS). During insertion, the pulling force almost linearly increases as a function of the length [Formula Omitted] of cable is inserted. The slope of these curves for the CS cables are approximately 74% that for the TF cable, although the mass per unit length of the CS cable is approximately 63% that of the TF cable. Thus, friction between the CS cable and the conduit is slightly greater than that between the TF cable and the conduit. The number [Formula Omitted] of rotations at the cable point for the TF cable increases to 50 almost linearly versus [Formula Omitted]. For [Formula Omitted], [Formula Omitted] for the CS cables also increases almost linearly with a slightly greater slope than for the TF cable. However, the slope decreases, and [Formula Omitted] becomes constant at 30 for [Formula Omitted]. During compaction, the number [Formula Omitted] of rotations at the tail of the TF cable, the 613-m-long CS cable, and the 918-m-long CS cable increases almost linearly versus compacted cable length to 23, 36, and 69, respectively. The X-ray transmission imaging of the CS conductor clarifies the distributions of the fifth-stage twist pitch of the cable [Formula Omitted] over the entire length of the conductor. These results are consistent with a geometric analysis based on [Formula Omitted] and [Formula Omitted]. The results for [Formula Omitted] peak at the cable point; thus, a sample of the conductor should be taken from the point to investigate how [Formula Omitted] elongation affects conductor performance.