The superconducting properties of Nb3Sn strands are very sensitive to strain. Measuring internal strain of Nb3 Sn in Cable-In-Conduit Conductors (CICC) is important for evaluating the superconducting performance of CICC. Internal strain can be determined by neutron diffraction measurement using Takumi of J-PARC. Neutron diffraction measurement becomes a strong tool for evaluating directly the internal strain of Nb3 Sn in CICC.
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