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| MOPLT155 |
Study of Beam-beam Effects at PEP-II
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896 |
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- I.V. Narsky, F.C. Porter
CALTECH, Pasadena, California
- Y. Cai, J. Seeman
SLAC, Menlo Park, California
- W. Kozanecki
CEA/DSM/DAPNIA, Gif-sur-Yvette
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Using a self-consistent, three-dimensional simulation program running on parallel supercomputers, we have simulated the beam-beam interaction at the PEP II asymmetric e+e- collider. In order to provide guidance to luminosity improvement in PEP-II, we have scanned the tunes and other machine parameters in both rings, and computed their impact on the luminosity and particle loss. Whenever possible, the code has been benchmarked against experimental measurements, at various beam currents, of luminosity and luminous-region size using the BaBar detector. These studies suggest that three-dimensional effects such as bunch lengthening may be important to understand a steep drop of luminosity near the peak currents.
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