Speaker
Description
In 2022, FEL light generation driven by LPA-produced electron beams was successfully demonstrated. At Helmholtz-Zentrum Dresden-Rossendorf (HZDR), we particularly focus on the seeded FEL configuration using the COXINEL beamline. Our ongoing efforts in the development of LPA-generated beams are concentrating on improving beam quality to increase FEL gain and enable operation at shorter wavelengths. In addition to parameters such as peak charge density, energy spread, and beam divergence, stability and reliability are essential requirements for qualifying LPAs for FEL applications.
Here, we present recent developments of the LPA injector at HZDR. These include the implementation of different injection schemes, such as density down-ramp injection and hybrid laser–particle-driven acceleration, as well as optimisation of beams generated via STII (self-truncated ionisation injection). Since the 2022 demonstration experiment, we have significantly increased the peak charge density of the LPA beams. Combined with improved stability—both shot-to-shot and day-to-day—this has enabled more precise FEL studies and allowed us to reach the high-gain regime, yet currently at UV wavelengths.
| Working group | WG1 |
|---|