Beam based undulator trajectory alignment at European XFEL
Accelerator Physics
2026-07-13 v1
Abstract
Precise alignment of the undulator trajectory onto a straight line is a per-requisite for high fidelity SASE operation, which in turn also enables non-standard operation modes like self-seeding or two-color operation. At European XFEL electron and photon beam-based method are combined with a step-by-step performance-based optimization to ensure that the trajectory is on a straight line over most of the length of the about 250 m long undulator system.
Cite
@article{arxiv.2607.11407,
title = {Beam based undulator trajectory alignment at European XFEL},
author = {Winfried Decking and Frank Brinker and Lars Froehlich and Matthias Scholz and Wolfgang Freund},
journal= {arXiv preprint arXiv:2607.11407},
year = {2026}
}