Abstract
The SuperKEKB accelerator has been designed to achieve 40 times higher than luminosity of KEKB B-factory. A nano-beam scheme is adopted in order to accomplish this target luminosity, however, this scheme restricts the dynamic aperture to small region due to strong nonlinearities which come from both final focus magnets and beam-beam interactions. The dynamic aperture which is shrunken by beam-beam effects is a big issue to keep enough beam lifetime for the machine operation. We report the issues on the dynamic aperture and a crab waist scheme to recover small dynamic aperture due to beam-beam effects.
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