Higher luminosity B-factories

The present B-factories PEP-II and KEKB have reached luminosities of 3-4×10³³/cm²/s and delivered integrated luminosity at rates in excess of 4 fb^-1 per month. The recent turn on of these two B-factories has shown that modern accelerator physics, design, and engineering can produce colliders that rapidly reach their design luminosities and deliver integrated luminosities capable of frontier particle physics discoveries. PEP-II and KEK-B with ongoing upgrade programs should reach luminosities of over 10³⁴ /cm²/s in a few years and with more aggressive improvements may reach luminosities of order 10³⁵/cm² /s by the end of the decade. However, due to particle physics requirements, the next generation B-factory may require significantly more luminosity. Initial parameters of a very high luminosity e⁺ e^- B-factory or Super B-Factory (SBF) are being developed incorporating several new ideas from the successful operation of the present generation e⁺e^- accelerators. A luminosity approaching 10³⁶ cm^-2 s^-1 appears possible. Furthermore, the ratio of average to peak luminosity may be increased by 30% due to continuous injection. The operation of this accelerator will be qualitatively different from present e⁺ e^- colliders due to this continuous injection