A lattice consistent with a peak luminosity of 10~(34) cm~(-2)s~(-1) is designed for the KEK B-Factory (KEKB). A new unit cell structure with 2.5π phase advance is applied in the arc so as to install the non-interleaved sextupole pairs efficiently. This cell structure also provides a wide range of tunability for the emittance and the momentum compaction factor, while maintaining the - I relation between sextupoles.
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