Abstract
A finite radius plasma is proposed to generate wakefields that can focus and accelerate positron beams in a plasma wakefield accelerator. The finite radius plasma reduces the restoring force acting on the plasma electrons forming the plasma wakefield, resulting in an elongation of the on-axis return point of the electrons and, hence, creating a long, high-density electron filament. This results in a region with accelerating and focusing fields for positrons, allowing for the acceleration and quality-preserving transport of high-charge positron beams.
Highlights
Plasma-based particle accelerators have attracted great interest owing to their high acceleration gradients which could enable a future compact linear electron-positron collider [1]
In the highly nonlinear blowout [2] or bubble [3] regime all plasma electrons are expelled from the drive beam propagation axis and an ion cavity is formed
We propose a novel method for the generation of wakefields suitable for both the acceleration and transport of positron beams
Summary
Plasma-based particle accelerators have attracted great interest owing to their high acceleration gradients which could enable a future compact linear electron-positron collider [1]. In the highly nonlinear blowout [2] or bubble [3] regime all plasma electrons are expelled from the drive beam propagation axis and an ion cavity is formed This cavity features a region with a transversely linear restoring force for relativistic electrons, together with large accelerating gradients. Previous works have proposed to employ hollow core electron-drive beams [7], positron drive beams [8], or hollow core plasma targets [9] for the generation of wakefields suitable for positron transport and acceleration. These concepts seem impractical and/or entail other challenges. We propose a novel method for the generation of wakefields suitable for both the acceleration and transport of positron beams.
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