Abstract 

Strong beam-beam effects at the interaction point of a high-energy e+e- linear collider such as CLIC lead to an emittance growth for the outgoing beams, as well as to the production of beamstrahlung photons and e+e- coherent pairs. In this seminar, an estimation is given first for the power losses due to the CLIC disrupted beam, beamstrahlung photons and e+e- coherent pairs along the 20 mrad post-collision line considered for ILC, with scaled magnet settings. It will be shown that such a design is not adapted for the CLIC conditions, in particular because of the too large amount of low-energy particles found in the disrupted beam and the coherent pairs. Therefore, a new design of the post-collision line will be discussed, based on vertical chicane magnets to separate the various components of the outgoing CLIC beam, prior to its transport to the dump.