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Report No.
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Neutron diffraction study of internal strain in Nb$$_{3}$$Sn Cable-In-Conduit Conductors

Hemmi, Tsutomu; Harjo, S.; Nunoya, Yoshihiko; Kajitani, Hideki; Koizumi, Norikiyo; Nakajima, Hideo; Aizawa, Kazuya; Machiya, Shutaro*; Osamura, Kozo*

Internal strain in Cable-In-Conduit Conductors (CICC) is caused by differences in the coefficients of thermal expansion between Nb$$_{3}$$Sn strands and the stainless steel jacket over a temperature range of 5 - 923 K. In addition, transverse electromagnetic loading is generated by a current of 68 kA and a magnetic field of 11.8 T in the case of ITER TF coils. The performances of Nb$$_{3}$$Sn strands change significantly, depending on the presence of strain. The presence of internal strain in Nb$$_{3}$$Sn cables is important to evaluate the superconducting performance. However, the strain of strands in the conductor has not been measured so far because of the cabling configuration and their location in a jacket. Internal strain can be determined by neutron diffraction measurement using Takumi of J-PARC. Test results of the neutron diffraction and the role of the neutron diffraction measurement for the investigation of Tcs degradation of short conductor sample will be presented and discussed.

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