Abstract
To evaluate presences of performance degradation due to strand bending in $ \hbox{Nb}_{3}\hbox{Sn}$ cables, methods for investigating strand bending in $\hbox{Nb}_{3}\hbox{Sn}$ cables were developed by JAEA and demonstrated for the He-inlets of the ITER toroidal field coils. Conductor elongation and residual strain during the reaction heat treatment were measured. In addition, high-resolution X-ray computerized tomography was used to visually search for strand bending in the $\hbox{Nb}_{3}\hbox{Sn}$ cable. As a result, no large strand bending was observed.
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