Beam-beam simulations for the 90/60 and 108/90 optics

Beam-beam simulations have been made for LEP using the program (BBEAM) written by S. Myers. The simulations were made for the 1996 machine layout using the 90/60 and 108/90 optics at 87 GeV and with bunch currents in the range of those observed in operation during 1996. A range of optics errors was explored and the results are compatible with what was observed during the year. There are no indications that either of these optics will be unsuitable for operation in the future from a beam-beam viewpoint, the results confirming previous expectations. The results also confirm that the region of tunes above the diagonal contains smaller islands of good performance than the traditional working points used in LEP.