New specifications for the SOLEIL project

Continuous interaction with potential users has led to an evolution of the source requirements: maximum brilliance greater than 10/sup 20/ ph/s/mm/sup 2//mrad/sup 2//0.1% /spl Delta//spl lambda///spl lambda/ from undulators in the keV energy range, while keeping the LURE specificities such as temporal structure and FEL operation. To meet these goals an optics tunable from 2 to 30 nm.rad has been optimized. Two kinds of straight sections (14 m and 7 m long) with high and low /spl beta/ functions are available for long undulators or special devices producing various polarizations and different wavelengths.