A Proposal for the TESLA High Energy Beam Switchyard

In the TESLA linear collider, two interaction regions are foreseen, one for ee collisions at zero crossing-angle, and the other one for ee , e e or collisions at about 40 mrad crossing angle. Beam switchyards must therefore be designed after the electron and positron(or electron) linacs to switch the electron and positron (or electron) beams and serve the two interaction regions. On the electron side, the switchyard will be installed only after the positron source system. After the linac exit, the high energy electron beam passes through a 100 m long wiggler where photons are produced. These photons are converted into electron and positron pairs on a target located 300 m from the wiggler exit. The electron beams are switched after the wiggler and transported towards either one of the two collisions point. On the positron side, the switchyard will be symmetric to the elctron one. The design of the beam switchyard is driven by the following constraints: