Machine implications for detectors and physics

Abstract

Future linear colliders are very different at many aspects because of low repetition rate (5∼200 Hz) and high accelerating gradient (22∼150 MeV/m). For high luminosity, the beam sizes must be squeezed in extremely small region at interaction point (IP). We briefly describe new phenomena at the IP, i.e. beamstrahlung process, creations of e+e− pairs and minijets. We also report machine implications related to the energy spread, beamstrahlung, bunch-train structure, beam polarizations and backgrounds for detectors and physics.