Progress of the ILC CFS design

The Global Design Effort [GDE] for the International Linear Collider [ILC] aims at the completion of Technical Design Report [TDR] in 2012. TDR investigates the most suitable design depending on the each site's characteristic. Because European and American site are extremely flat and tunnel depth is comparatively shallow, the ground facilities become the main subject. On the other hand, because Asian mountain site has the topography full of ups and downs, all facilities almost set it up in the underground structure. This report introduces development of the technical examination and plan about the main facilities such as civil works structure, electric power supply facilities and cooling water facilities in Japanese mountainous site. In addition, we report the progress of the geological survey about the candidate construction site of the ILC facility in Japan. (author)