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Evaluation of bending strain in Nb$$_{3}$$Sn strands of CIC conductor using neutron diffraction

中性子回折を用いたCIC導体のNb$$_{3}$$Sn素線の曲げひずみ評価

辺見 努*; Harjo, S.; 梶谷 秀樹*; 諏訪 友音*; 齊藤 徹*; 相澤 一也; 長村 光造*; 小泉 徳潔*

Hemmi, Tsutomu*; Harjo, S.; Kajitani, Hideki*; Suwa, Tomone*; Saito, Toru*; Aizawa, Kazuya; Osamura, Kozo*; Koizumi, Norikiyo*

The superconducting property of Nb$$_{3}$$Sn strands is very sensitive to strain. The transverse electromagnetic loading has been considered as a major origin of the degradation of Nb$$_{3}$$Sn cable-in-conduit conductors (CICCs) due to the local bending. Since the bending pitch is around 5 mm due to contacting of strands compacted by the electromagnetic transverse loading, there is a possibility of a large bending strain with small deflection of strands. The bending strain of the strands cannot be evaluated from only the small deflection obtained visually. Measuring bending strain of Nb$$_{3}$$Sn strand in CICCs is important for evaluating the conductor performance. Neutrons, which have a large penetration depth, are a powerful tool to evaluate the internal strain of Nb$$_{3}$$Sn in the CICC. This paper shows that the bending strain in Nb$$_{3}$$Sn strands of CICCs can be determined by the neutron diffraction profile nondestructively and quantitatively.

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