One of the most severe limitations in high-intensity particle colliders is
the beam-beam interaction, i.e. the perturbation of the beams as they cross the
opposing beams. This introduction to beam-beam effects concentrates on a
description of the phenomena that are present in modern colliding beam
facilities.Comment: 29 pages, contribution to the CAS - CERN Accelerator School: Advanced
Accelerator Physics Course, Trondheim, Norway, 18-29 Aug 201