A conceptual design of the international thermonuclear experimental reactor central solenoid

One of the central solenoid (CS) designs for the International Thermonuclear Experimental Reactor (ITER) superconducting magnet system is presented. The CS part of this magnet system will be a vertical stack of eight modules, approximately 16 m high, each having approximate dimensions of 4.1-m o.d., 2.8-m i.d., and 1.9-m h. The peak field at the bore is approximately 13.5 T. A cable-in-conduit conductor with Nb₃ Sn composite wire will be used to wind the coils. The overall coil fabrication will use the insulate-wind-react-impregnate method. Coil modules will be fabricated using double-pancake coils with all splice joints located in the low-field region on the outside of the coil. All coils will be structurally graded with high-strength steel reinforcement which is cowound with the conductor. Further details of the CS coil design and analysis are described