Göttingen 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

AKBP: Arbeitskreis Beschleunigerphysik

AKBP 4: AKBP Posters

AKBP 4.17: Poster

Dienstag, 1. April 2025, 16:30–18:00, ZHG Foyer 1. OG

Thermal emittance measurements of photocathodes using single-shot techniques at the European XFEL — •Meng Cai — University of Hamburg, Mittelweg 177, 20148 Hamburg — DESY, Notkestraße 85, 22607 Hamburg

The operation of the European XFEL relies on the generation of high-quality electron beams at the photoinjector exit, with peak brightness limited by the photocathode's thermal emittance. Cathode characteristics evolve over time due to multiple cathode laser properties and actual gun conditions, making regular measurements essential for injector optimization. This work explores a single-shot measurement technique at the European XFEL to image and measure the transverse momentum distribution of photoemitted electrons. This method maps the momentum onto an observation screen, greatly enhancing time efficiency for thermal emittance measurements while preserving high spatial and momentum resolution.

Keywords: photocathode; thermal emittance; European XFEL