DOUBLING THE PEP-II LUMINOSITY IN SIMULATIONS

Simulations show that luminosity of the PEP-II B- factory can be doubled from its present peak value of 1×10 34 cm −2 s −1 . The particle simulation code BBI devel- oped for studying beam-beam interaction was used to per- form the simulations. It was first found that the parasitic collisions significantly degrade the simulated luminosity as the beam currents are increased from 3A and 1.7A to 4A and 2.2A in the low and high energy rings, respectively. The effect of changes in various accelerator parameters on luminosity was then studied in detail from a rough start- ing point based on analytic estimates and in the process we systematically optimized the luminosity and showed that a luminosity of over 2 × 10 34 cm −2 s −1 is achievable within feasible limits.