In this paper, we perform a detailed study of the power losses along the postcollision extraction line of a TeV e + e − collider with a crossing angle of 20 mrad between the beams at the interaction point. Five cases are considered here: four luminosity configurations for ILC and one for CLIC. For all of them, the strong beam-beam effects at the interaction point lead to an emittance growth for the outgoing beams, as well as to the production of beamstrahlung photons and e + e − pairs. The

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... losses along the 20 mrad extraction line, which are due to energy * Uppsala University, Sweden † Stanford Linear Accelerator Center, USA