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Plasma Wakefield Acceleration represents one of the most promising techniquesable to overcome the limits of conventional RF technology and make possible thedevelopment of compact accelerators. With respect to the laser-driven schemes,the beam-driven scenario is not limited by diffraction and dephasing issues,thus it allows to achieve larger acceleration lengths. One of the mostprominent drawback, conversely, occurs at the end of the acceleration processand consists of removing the depleted high-charge driver while preserving themain features (emittance and peak current) of the accelerated witness bunch.Here we present a theoretical study demonstrating the possibility to reachthese goals by using an innovative system consisting of an array of beamcollimators and discharge-capillaries operating as active-plasma lenses. Such asystem allows to extract and transport the accelerated and highly divergentwitness bunch and, at the same time, provides for the removal of the driver.The study is completed by a set of numerical simulations conducted fordifferent beam configurations. The physics of the interaction of particles withcollimator is also investigated.

Plasma lens-based beam extraction and removal system for Plasma Wakefield Acceleration experiments