The overall planning for the FCC-ee machine design foresees to converge on the optics and beam dynamics by autumn 2015. Presently two variants are being studied, the crab waist – small emittance option, mainly by BINP, and the small crossing angle – variable cell option with constant geometric emittance, mainly by CERN. The crab waist study is well advanced and an intermediate (internal) review is planned for 12 June 2015, to evaluate the status and detect any critical areas. Work activity on the small crossing angle and possible other optics versions will be increased in the coming months, to arrive at a comparable level. An external review of both variants is then foreseen for second half of September 2015.
Reviewers: Alain Blondel, Stephane Fartoukh, John Jowett, Jean-Pierre Koutchouk, Katsunobu Oide (Chair), Pantaleo Raimondi
