Abstract
Plasma Wakefield Acceleration represents one of the most promising techniques able to overcome the limits of conventional RF technology and make possible the development 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 most prominent drawback, conversely, occurs at the end of the acceleration process and consists of removing the depleted high-charge driver while preserving the main features (emittance and peak current) of the accelerated witness bunch. Here we present a theoretical study demonstrating the possibility to reach these goals by using an innovative system consisting of an array of beam collimators and discharge-capillaries operating as active-plasma lenses. Such a system allows to extract and transport the accelerated and highly divergent witness bunch and, at the same time, provides for the removal of the driver. The study is completed by a set of numerical simulations conducted for different beam configurations. The physics of the interaction of particles with collimator is also investigated.
Highlights
Plasma-based acceleration, driven by either ultrashort laser pulses [1,2,3] or electron bunches [4,5,6], represents one of the most promising techniques able to overcome the limits of conventional rf technology and allow the development of compact accelerators
The calculation we presented suggests that the proposed system is fully compatible with normal-conducting accelerator facilities operating at frequencies of 10–100 Hz, like the one envisioned by the EuPRAXIA design study
As highlighted in this work, a drawback is represented by the removal of the high-charge and energy-depleted driver bunch and, at the same time, the need to provide an efficient capture of the witness bunch avoiding its normalized emittance degradation
Summary
Plasma-based acceleration, driven by either ultrashort laser pulses [1,2,3] or electron bunches [4,5,6], represents one of the most promising techniques able to overcome the limits of conventional rf technology and allow the development of compact accelerators. For PWFA another issue is represented by the removal of the high-charge energy-depleted driver(s) [16] In this case, it is evident that simple collimating apertures cannot be employed without affecting the witness charge. V B), allowing one to evaluate the effective removal of the driver particles and the effects of their interaction with the surrounding materials
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