Evaluation of Thermal Strain Caused by Nb<sub>3</sub>Sn Reaction Heat Treatment for the ITER Cable-in-conduit Conductors
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Abstract
Cable-in-conduit (CIC) conductors using Nb3Sn strands will be used in ITER toroidal field (TF) coils. Heat treatment generates thermal strain in CIC conductors because of the difference of the thermal expansion between the Nb3Sn strands and the stainless steal jacket. The TF coil winding fabrication method and design of the conductor joint should be determined while taking into account the elongation/shrinkage of the CIC conductor and its residual force as the result of thermal strain. The authors developed a new apparatus to evaluate these factors, and the conductors for the TF coils were measured. The maximum elongation/shrinkage of the conductors was 0.03%, and the maximum residual force was 35 kN. A winding method for the TF coil is proposed based on these results.
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