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Behavior of Nb$$_{3}$$Sn cable assembled with conduit for ITER central solenoid

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*

JAEA procures all superconductors for central solenoid (CS) in the ITER project. The cable is inserted into a conduit and compacted with it. During the insertion, the number of the rotation at the point ($$N_{p}$$) of the TF cable increased linearly to 50 against the inserted cable length ($$l_{i}$$). At first, $$N_{p}$$ of the CS cable also increased linearly by $$l_{i}$$ of 150 m. However, the increasing rate declined and the $$N_{p}$$ became constant to 30 at 600 m. During the compaction, the number of the rotation at the tail ($$N_{t}$$) of the CS cable increased linearly to 69 against the compacted cable length ($$l_{c}$$). It is important to measure not only $$N_{p}$$ but also $$N_{t}$$ because the rotation affects the twist pitch of the cable ($$l_{p}$$). After manufacturing the CS conductor, an X-ray transmission imaging made clear the $$l_{p}$$ along the whole length of the conductor for the first time. The $$l_{p}$$ peaked at the point; thus, a conductor sample should be taken there to investigate the effect of the $$l_{p}$$ elongation on the conductor performance.

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Category:Engineering, Electrical & Electronic

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