Status of design study on the ILC conventional facility

ILC-GDE announced officially the reference design report as a baseline design of the ILC facility in 2007. GDE continues working on a study about the strawman baseline as the review plan of the baseline design in search of the cost-reduction and feasibility. We proposed a new design scheme more suitable for the Japanese mountainous regions in conjunction with this work process and took an international review in June of this year. We face the work of Technical Design Phase-2 as a further technical design study during 2012 from the latter half of 2010. We report it about the change of facility design scheme and the status of ILC in this paper. (author)