Dispersion-free steering beam based alignment at SwissFEL

Abstract Micron-level alignment of the undulator line is required for successful operation linear accelerator based high gain free electron lasers to produce powerful radiation at X-rays’ wavelengths. Such precision in straightness trajectory allows an optimal transverse superposition between electrons and photon beam. This extremely challenging can only be achieved via beam-based techniques. In this paper we will report on dispersion-free steering approach implemented SwissFEL, that helped achieving improved performance both hard soft X-ray beamlines.