Preliminary structural analysis of the toroidal field coils for T-10M

Abstract

A structural analysis of the T-10M tokamak toroidal field (TF) coil system has been performed. Two TF coil shapes were proposed, one oval and the other circular. Each TF coil system is composed of 24 coils. The oval TF coil system has a 2.4-m major radius with a minor bore diameter of 2.15 m and a major bore diameter of 3.28 m. The circular TF coil system has a 2.5-m major radius with a 2.2-m bore diameter. The cross sections of both TF coil shapes have rectangular dimensions of 0.4 m by 0.26 m with a 0.36-m by 0.22-m winding cavity symmetrically placed within the cross section. The current of each coil is 1.75 MA. Either geometry produces a magnetic field of 3.5 T on axis, 2.4 m from the machine center line. This study reports the results of a cooperative investigation to determine which TF coil shape operates in a minimum stress configuration. The study is a part of the joint U.S.A./U.S.S.R. scientific exchange. The scope of the analysis covers only the in-plane force distribution produced by the magnetic field. Based upon the preceding conditions the oval TF coil shape appears to be superior to the circular TF coil shape. Further, the oval TF coil shape in its present design has a significant safety margin between working and yield stress under normal operating conditions. The circular design, however, is less sensitive to magnetic field perturbations which may be encountered in proof testing