Progress on design and development of ITER equatorial launcher; Analytical investigation and R&D of the launcher components for the design improvement

Takahashi, Koji; Kobayashi, Noriyuki; Omori, Junji; Suzuki, Satoshi; Kasugai, Atsushi; Sakamoto, Keishi

Progress on design of an ITER equatorial EC Launcher with analytical and R&D studies of the components is described. The modified design of the front shield module is proposed with electromagnetic and structure analysis. The analytical investigation of the modified steering mirror design shows that maximum temperature and stress intensity are 289C and 336 MPa on the mirror surface (copper alloy) and the inner surface of cooling tube (SS316) in the mirror, respectively. These results are less than allowable level. High heat irradiation experiment of the mirror mock-up and fatigue test of the spiral tube were carried out and their results convinced that the concept of the steering mirror structure was feasible. The results on neutron irradiation test of the composing material and the alternatives such as polyimide and liquid crystal polymer for an ultrasonic motor indicate that the motor with those materials is available for the ITER launcher.