The crossing angle in CLIC

Lower limits on the crossing angle at the interaction-point (IP) of the compact linear collider (CLIC) are set by the multi-bunch kink instability, which, at 3 TeV centre-of-mass energy, is strongly affected by coherent pairs. Aperture requirements for the spent beam introduce a second limitation. Finally, synchrotron radiation in the detector solenoid field, in the solenoid fringe field, and in the final quadrupole field mposes an upper limit on the crossing angle.