Non-interleaved FFS design

Abstract

The requirements on the Final Focusing System (FFS) for a new linear collider has lead to lattice designs where chromaticity is corrected either locally or non-locally. Here, we present the status of an alternative lattice design developed for the current CLIC 500GeV beam parameters where chromaticity is corrected upstream the Final Doublet (FD) and the geometrical components in the vertical plane are corrected locally. The diagnose of this design showed to possible variations two the lattice : the second order dispersion and its derivative with respect to $s$ must be cancelled before the FD, or some dispersion must be tolerated at the sextupole located inside the FD.