Abstract
The final focus system of the Compact Linear Collider (CLIC) features a crab cavity just before the final quadrupole doublet to ensure head-on collisions at the interaction point. A decrease in the expected luminosity with respect to the case without crossing angle has been recently observed in simulations for the CLIC baseline configuration. This effect is explained from the aberrations induced due to a $z$-dependent off-center horizontal orbit in the final focus sextupoles produced by the crab cavity. Three options to recover from this loss are explored. The effect of the longitudinal $E\mathrm{\text{\ensuremath{-}}}z$ correlation of the incoming beam from the linac is taken into account and its effect on the expected luminosity is evaluated.
Highlights
A horizontal crossing angle (c) between the beams at the interaction point (IP) is introduced in the Compact Linear Collider (CLIC) beam delivery system (BDS) [1] to minimize effects of parasitic crossing of bunches and to extract the spent beam cleanly
The enhancement factor that takes into account the effect of the disruptive fields, i.e., Pinch effect, is reduced as the focusing effect of one beam on the other is minimized in the presence of a crossing angle
To recover head-on collisions with a certain crossing angle, Palmer introduced the concept of crab cavities (CC) [3]
Summary
A horizontal crossing angle (c) between the beams at the interaction point (IP) is introduced in the Compact Linear Collider (CLIC) beam delivery system (BDS) [1] to minimize effects of parasitic crossing of bunches and to extract the spent beam cleanly. This crossing scheme produces a loss of geometric luminosity with respect to the zero crossing angle collision according to. The sign of the tilts is such that the two bunches are in line during collision In their own center of mass, they interact with zero crossing angle and a priori they suffer no luminosity loss [3]. The reasons for the loss of luminosity are explored and some possible cures are proposed
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