FUTURE VERY HIGH LUMINOSITY OPTIONS FOR PEP-II

A Super B Factory, an asymmetric e+e- collider with a luminosity of 1036 cm-2s-1, can provide a sensitive probe of new physics in the flavor sector of the Standard Model. The success of PEP-II and KEKB in producing unprecedented luminosity with unprecedented short commissioning time has taught us about the accelerator physics of asymmetric e+e- colliders in a new parameter regime. It appears to be possible to build on this success to advance the state of the accelerator art by building a collider at a luminosity approaching 1036 cm-2s-1. Such a collider would produce an integrated luminosity up to 10,000 fb-1 (10 ab-1) in a running year. Design studies are underway to arrive at a complete parameter set based on a collider in the PEP-II tunnel but with an upgraded RF system (perhaps a higher frequency) and an upgraded interaction region (1-6). 1 nsec scale, down from the present 4 nsec time. E) Much shorter bunches will be needed; on the order of 2 mm. F) Higher-power vacuum chambers and HOM tolerant chambers will be needed. The use of expansion bellows will need to be minimized or a high-power design developed. G) Very low vertical beta functions at the interaction of about 1.5 to 2.5 mm will be needed. H) Special chromaticity corrections will be needed. I) Every technique to reduce the wall plug power will need to be used. For example, reducing the energy asymmetry to reduce synchrotron radiation, increase the vacuum chamber bores to reduce resistive wall effects, and increasing the RF cavity bores to reduce HOM losses.