Comparing beam-beam effects in three LHC injection schemes

In part of the straight sections of the LHC the two beams share a common beam tube. Therefore the bunches cross each other not only at the interaction point, but as well at many places on either side, with a typical transverse separation of 10 times the transverse beam size. These "parasitic" encounters lead to orbit distortions and tune shifts, in addition to higher order effects. In this note, the effects of the beam-beam interactions on the orbits, tunes, and luminosity are presented for three different injection schemes: the nominal injection scheme (April 2000), an alternative scheme proposed by P. Collier, and the fully symmetric injection scheme which serves as a reference[1].