Abstract
The structural materials of the toroidal field (TF) coils for fusion reactor are required to have higher strength and fracture toughness than those of ordinary commercial products, mainly because of large electromagnetic forces. During the preliminary design of the Japanese Large Coil Task (LCT) coil at the Japan Atomic Energy Research Institute (JAERI), ordinary 304L stainless steel was selected as the structural material for the LCT coil case. However, in the detailed design considering the winding rigidity and the slipping effect between the winding and the coil case, the stress intensity on the coillcase was increased more than that of the preliminary analysis. Finally, yield strength more than 700 MFa at 4 K was specified for the LCT structural material on the basis of many verification tests and analyses. Accordingly, ordinary 304L stainless steel could not be employed because of its relatively low yield strength at 4 K.
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