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The 70 MeV Drive and the 15 MeV Witness linacs propagate in opposite directions, and come to a common area designated as the beamline switchyard where each linac can branch out into any of several beamlines where experiments are conducted.

The 70 MeV Drive and the 15 MeV Witness linacs propagate in opposite directions, and come to a common area designated as the beamline switchyard, where each linac can branch out into any of several beamlines where experiments are conducted. The primary beamline is optimized for high-charge wakefield experiments to be performed using either the collinear configuration, in which the drive and witness bunches travel along the same structure, or the two-beam-accelerator configuration, in which RF power is transferred from the drive beam decelerating structure to the witness beam accelerating structure, by means of a waveguide.  An emittance exchange beamline receives the beam from the drive linac and can be used to generate longitudinally shaped drive bunch followed by a trailing witness bunch for mm-wave wakefield acceleration experiments as well creating bunch trains for coherent THz radiation generation.