The CLIC beam delivery system
(BDS) has very low tolerances to alignment errors. Even small
transverse misalignments of 1-5 um randomly assigned to
the BDS quadrupoles can result in luminosity loss. Sophisticated
correction schemes based on movement of the BDS quadrupoles have
been developed. In order to vary collision parameters of a beam in
the interaction point a set of tuning knobs has been also found.