A HIGH TRANSFORMER RATIO PLASMA WAKEFIELD ACCELERATOR SCHEME FOR FACET∗

The ideal drive beam current profile for the plasma wakefield accelerator (PWFA) has been predicted by 1D and 2D simulations to be characterized by a triangular ramp that rises linearly from head to tail, followed by a sharp drop. A technique for generating such bunches experi-mentally was recently demonstrated. We present here an adaptation of this scheme to generate ramped bunches us-ing the 23 GeV electron beam produced in the first two-thirds of the SLAC linac, and discuss plans to implement this scheme for high transformer ratio demonstration exper-iments at the FACET plasma wakefield accelerator facility