Study of the beam-beam limit in e+e- circular colliders
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Study of the beam-beam limit in e+e- circular colliders

  • Author(s): Ohmi, K.
  • Tawada, M.
  • Cai, Y.
  • Kamada, S.
  • Oide, K.
  • Qiang, J.
  • et al.
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 phenominon 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)~; 0.1 for a B factory with dampint time of several thousand turns.

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