Speaker
Description
Plasma Accelerators can generate high-energy electron bunches over just a few centimetres of distance, offering the potential to become a promising alternative to conventional particle accelerators.
In our work we performed numerical simulations of wakefield excitation by a strong laser pulse using the OSIRIS code to investigate the mechanisms for controlling the accelerated bunch. We explored how the density profile of a cylindrical plasma channel influences the stability and energy gain of an externally injected electron bunch.
By selecting the parameters and utilizing an increasing plasma density gradient, we achieved the formation of an accelerating wakefield plateau. This plateau is crucial because it significantly reduces the electron bunch's energy spread.
We also examined the trade-off between bunch charge density and stability. We observed that increasing the bunch density caused its instability and lead to its subsequent break-up. However, by reducing the bunch’s longitudinal length at the same time, we were able to suppress this instability and keep stable acceleration for even very dense bunches. This work is important for developing stable plasma injectors for facilities like PETRA IV.
Footnotes
- These results were obtained while working at the DESY Summer Student Programme 2025.
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