BNL, Upton, Long Island, New York, USA
The LHC luminosity upgrade aims at reducing the collision point betas by a factor of 2-3 of the design value. Consequently the Piwinski angle is increased well beyond 1 to keep a normalized beam separation in the common focusing channels, thus diminishing the benefit of the beta* reduction. Crab cavities will not only recover this luminosity loss but also enable luminosity levelling, a vital ingredient for the upgrade. The baseline scenario for a crab crossing implementation in the LHC, primarily focusing on the RF cavity development is presented. Constraints from aperture, impedance and machine protection are also highlighted.
