Halo Formation due to Beam-Beam Interaction

In colliding-beam storage rings transverse and longitudinal beam halo is generated, or depleted, by the effect of head-on and long-range beam-beam collisions. Measurements from several past and present lepton or hadron colliders are compared with simulations and analytical models, highlighting a few halo-specific techniques. This overview concludes with an outlook on the future Large Hadron Collider (LHC), where long-range beam-beam collisions are the dominant perturbation of particle motion and beam-beam compensation schemes appear a promising remedy.