Speaker
Description
Plasma-based accelerators can produce high-brightness, high-energy electron bunches and are considered a promising alternative to conventional accelerator technology and a potential upgrade path for existing large-scale facilities.
Collider concepts based on plasma wakefield acceleration have already been proposed, and plasma-based injectors for XFELs are under active development.
Both free-electron lasers and particle colliders require highly efficient acceleration schemes capable of delivering electron bunches with low energy spread.
We performed numerical simulations of wakefield excitation by a strong laser pulse using the OSIRIS code, a 2D3V fully relativistic electromagnetic particle-in-cell framework, in a cylindrical plasma channel used to control laser evolution.
We show that a gradually increasing internal plasma density gradient can be employed to control the phase position of an externally injected electron bunch. Using this approach, we enhance the accelerating field and suppress undesirable self-injection.
By optimizing the bunch parameters, we achieved significant energy gain over short distances and tested a "point-like" bunch configuration, which produced an exceptional effective acceleration gradient. In this case, the relative energy spread was as low as 0.4%, and the injected bunch remained within the focusing field throughout the simulation. This scheme shows strong potential for generating high-quality electron beams at facilities such as PETRA IV
Footnotes
- These results were obtained while working at the DESY Summer Student Programme 2025.
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