Technical aspects of the soleil project

Abstract
The SOLEIL project is built around a 2.15 GeV positron storage ring with its own injector, i.e. a linear accelerator and a booster. The scientific community have required a large number of insertion devices optimized in the soft X-ray range and the ultra-violet, several operation modes offering a high brilliance or a usable time structure with a maximum beam lifetime. The choice of the machine energy, of positrons circulating as particles, of the magnetic lattice, and the type of radio-frequency, etc. will be discussed through a more detailed presentation of the machine. Comments will be made about the tolerances required for the beam and the implications for the building stability.