title: Beam-beam limit in e+e- circular colliders.
abstract: Beam-beam effects limit the luminosity of circular colliders. Once the bunch population exceeds a threshold, the luminosity increases at a slower rate. This phenomenon is called the beam-beam limit. Onset of the beam-beam limit has been analyzed with various simulation methods based on the weak-strong and strong-strong models. We have observed that an incoherent phenomenon is mainly concerned in the beam-beam limit. The simulation have shown that equilibrium distributions of the two colliding beams are distorted from Gaussians when the luminosity is limited. The beam-beam limit is estimated to be xi approximately 0.1 for a B factory with damping time of several thousand turns.
authors.affiliation: KEK, 1-1 Oho, Tsukuba, 305-0801, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ohmi
authors.forename: M
authors.initials: M
authors.lastname: Tawada
authors.forename: Y
authors.initials: Y
authors.lastname: Cai
authors.forename: S
authors.initials: S
authors.lastname: Kamada
authors.forename: K
authors.initials: K
authors.lastname: Oide
authors.forename: J
authors.initials: J
authors.lastname: Qiang