Abstract
The crab waist collision scheme promises significant luminosity gain. The successful upgrade of the $\mathrm{DA}\mathrm{\ensuremath{\Phi}}\mathrm{NE}$ collider proved the principle of crab waist collision and increased luminosity 3 times. Therefore, several new projects try to implement the scheme. The paper reviews interaction region designs with the crab waist collision scheme for already existent collider $\mathrm{DA}\mathrm{\ensuremath{\Phi}}\mathrm{NE}$ and SuperKEKB, presently undergoing commissioning, for the projects of SuperB in Italy, CTau in Novosibirsk and FCC-ee at CERN.
Highlights
Invention of the crab waist collision scheme promises an increase of luminosity by several orders of magnitude for the specially designed collider with respect to conventional
DAΦNE is the only collider among the reviewed projects which does not report significant dynamic aperture loss from the crab sextupoles
We notice that SuperKEKB has the highest coefficients for kinematic term and for quadrupole fringe (Table V)
Summary
Invention of the crab waist collision scheme promises an increase of luminosity by several orders of magnitude for the specially designed collider with respect to conventional. A successful test of the scheme at the existent Italian lepton collider DAΦNE increased luminosity 3 times from 1.5 × 1032 cm−2 s−1 to 4.5 × 1032 cm−2 s−1 and proved the principle of crab waist. The projects of the new circular colliders exploit the crab waist interaction scheme. Several designs experienced dynamic aperture degradation trying to implement crab waist sextupoles, e.g. SuperKEKB. In this review we briefly depict the crab waist concept, describe optical designs of interaction regions of the already existent collider DAΦNE, SuperKEKB, presently undergoing commissioning, the projects of SuperB in Italy, CTau in Novosibirsk and FCC-ee at CERN, discuss the problem of dynamic aperture degradation in several designs and propose an explanation of the effect
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