Study of Beam - Beam Effects at PEP - II ∗

Using a self-consistent three-dimensional simulation running on parallel supercomputers, we have modeled the beam-beam interaction at the PEP-II asymmetric e+e− collider. To provide guidance for luminosity improvement, we scanned the tunes and currents in both rings and computed their impact on the luminosity and transverse beam sizes. We also studied the effects of colliding the beams with a small crossing angle. Where possible, the code was benchmarked against experimental measurements of luminosity and beam sizes, yielding an acceptable agreement. (presented at the ninth European Particle Accelerator Conference, July 5-9, 2004, Lucerne, Switzerland) ∗Work partially supported by the Department of Energy under Contract No. DE-AC03-76SF00515. Study of Beam-Beam Effects at PEP-II I. Narsky∗, F. Porter, California Institute of Technology, Pasadena, CA 91125, USA† W. Kozanecki, DSM/DAPNIA, CEA/Saclay, F-91191 Gif-sur-Yvette, France Y. Cai, J. Seeman, Stanford Linear Accelerator, Stanford, CA 94309, USA‡