Oct 9 – 13, 2022
FHNW Campus Brugg-Windisch
Europe/Zurich timezone

Longitudinal beam-based feedback system at the European XFEL

Oct 13, 2022, 2:05 PM
Aula (Building 3)


Building 3

Oral Low Level RF Workshop 2022 Beam Measurements and Feedback Control


Björn Lautenschlager (DESY)


For pump-probe experiments, where the FEL photon pulses interact together with an external laser, a highly temporal stability is mandatory. The longitudinal beam-based feedback system at the European XFEL stabilizes the arrival time, measured by a bunch arrival time monitor (BAM). To compensate fast arrival time fluctuations of the bunch trains, the energy in front of a bunch compression chicane is modulated by the low level RF (LLRF) system of the superconducting RF (SRF) cavities. Measurements at the EuXFEL shows train-to-train arrival time stabilities down to the sub-10 fs level if the longitudinal intra bunch-train feedback (L-IBFB) is activated at the LLRF system.

Primary authors

Presentation materials