Speaker
Description
European XFEL is commonly providing user operation with self-amplified spontaneous emission (SASE) and hard x-ray self-seeding (HXRSS), ref [1]. A facility-internal project had been started to demonstrate operation of a cavity-based XFEL (CB-XFEL), ref [2], which promises to improve spectral purity and brightness significantly. The first demonstration of a CBXFEL was achieved in May 2025, ref [3]. The X-ray photon diagnostics (XPD) group designed and deployed dedicated diagnostics inside the cavity, operated these as well as diagnostics outside the cavity and set up new online data processing pipelines. The results and performance of these hardware and software elements and their contribution to the overall project success are explained.
[1] Gianluca A. Geloni, "High repetition rate hard x-ray self-seeding at the European XFEL, " Proc. SPIE PC13536, X-Ray Free-Electron Lasers:
Advances in Source Development and Instrumentation VII, PC1353604 (6 June 2025)
[2] Patrick Rauer et.al., "Cavity based x-ray free electron laser demonstrator at the European X-ray Free Electron Laser facility", Phys. Rev. Accel. Beams 26, 020701 (2023).
[3] Rauer, P., Bahns, I., Friedrich, B. et al. Lasing of a cavity-based X-ray source. Nature (2026). https://doi.org/10.1038/s41586-025-10025-x
Footnotes
- Gianluca A. Geloni, "High repetition rate hard x-ray self-seeding at the European XFEL, " Proc. SPIE PC13536, X-Ray Free-Electron Lasers: Advances in Source Development and Instrumentation VII, PC1353604 (6 June 2025)
** Patrick Rauer et.al., "Cavity based x-ray free electron laser demonstrator at the European X-ray Free Electron Laser facility", Phys. Rev. Accel. Beams 26, 020701 (2023). *** Rauer, P., Bahns, I., Friedrich, B. et al. Lasing of a cavity-based X-ray source. Nature (2026). ht
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