Structural analysis of the ITER EDA magnet system

The most recent design of the ITER magnet system is easier to assemble and is expected to be more conventionally manufactured. A stainless steel case with pancake wound plates replaces the earlier poloidally wrapped plate Toroidal Field (TF) coil design. The number of TF coils has been reduced from 24 to 20 to ease access. The price of these improvements has been an increase in radial build for the TF coil, and a reallocation of space within the reactor. The TF and central solenoid (CS) are still bucked. The TF case is strong enough to support most of the load when, it in turn, is supported by additional external structures. A fluted torque shell on the outside of the CS provides a bearing surface for the TF and this along with the CS, and the TF inner legs, takes the global twist applied to the central column of the machine.