Speaker
Description
While the arrival time stability of electron bunches in a free-electron laser (FEL) can be as precise as 5 fs rms, the arrival time jitter of optical laser pulses is around 10 fs rms or worse at the experimental setups. In this contribution, we will provide an update on a laser pulse arrival time monitor, where the arrival time of optical pulses will be measured against an optical reference from the laser-based synchronisation system. By performing measurements as close as possible to the interaction point, we can evaluate and correct instabilities caused by e.g. laser beam transport or other manipulation, either by time-sorting experimental data or through active feedback loops, with recent data collected at the FELs FLASH and EuXFEL will be presented.
