Turn Around Loop and Chicane for Bunch Compression and Path Length Tuning in the CLIC Drive Beam

To achieve the proposed luminosity, phase and energy of the CLIC drive beam must meet tight specifications. The phase stability is achieved by a feedforward system consisting of two phase measurement stations intersected by a bunch compressor chicane in front of a turn around loop and a final chicane for bunch compression and path length correction behind the loop. This chicane is foreseen to compress the bunches to a final length of 0. 4m m and should allow a path length tuning of 0. 1m m. Suitable layouts for the turn around loop and the chicanes and results of beam dynamics simulations including incoherent and coherent synchrotron radiation are presented.