Structure design of the central solenoid in JT-60SA

Asakawa, Shuji; Tsuchiya, Katsuhiko; Kuramochi, Masaya; Yoshida, Kiyoshi

The upgrade of JT-60U magnet system to superconducting coils (JT-60SA: JT-60 Super Advanced) has been decided by parties of Japanese government (JA) and European commission (EU). The magnet system for JT-60SA consists of a central solenoid (CS), equilibrium field (EF) coils, toroidal field (TF) coils. The central solenoid consists of the four winding pack modules. In order to counteract the thermal contraction as well as the electric magnetic repulsion and attraction together with other forces generated in each module, it is necessary to apply pre-loading to the support structure of the solenoid and to pursue a structure which is capable of sustaining such loading. In the present report, the structural design of the supporting structure of the solenoid and the jackets of the conducting coils in the modules is verified analytically, and the results indicate that the structural design satisfies the "Codes for Fusion Facilities Rules on Superconducting Magnet Structure".