Pep-ii Status and Future Plans*

The PEP-II B-Factory at SLAC has reached a luminosity of 4.6x10/cm/s and has delivered 94 fb of data to the BaBar physics detector by the end of May 2002. PEP-II has delivered over 309 pb in 24 hours and over 6.35 fb in one month. The accelerator physics issues for these performance levels include electron cloud, beam-beam effects, parasitic beam-beam collisions, and RF beam loading. Upgrades to PEP-II are underway to increase the luminosity to 2 to 4x10/cm/s by FY2007. The accelerator physics effects that must be dealt with during these upgrades include RF loading, multi-bunch feedback, IR beta function, bunch length reduction, and interaction region vacuum chamber upgrades. Table 1: PEP-II parameters at peak luminosity Parameter PEP-II LER PEP-II HER Energy (GeV) 3.1 9.0 Vertical tune 36.552 23.638 Horizontal tune 38.650 24.582 Current (mA) 1775 1060 Bunch charge (x10) 10.2 6.1 RF klystrons/cavities 3/6 5/20 Number bunches 800 800 Lumin. (x10/cm/s) 4.6 4.6 βy* (mm) 9 12.5