High-accuracy wavefront sensing for x-ray free electron lasers

• DOI: 10.1364/optica.5.000967
• Publication Date: 2018-08-06T15:36:15Z
• Authors: Yanwei Liu; Matthew Seaberg; Diling Zhu; Jacek Krzywinski; Frank Seiboth; Corey Hardin; Daniele Cocco; Andrew Aquila; Bob Nagler; Hae Ja Lee; Sébastien Boutet; Yiping Feng; Yuantao Ding; Gabriel Marcus; Anne Sakdinawat
• Keywords: Wavefront sensor; X-ray optics; Instrumentation; Deformable Mirror

Systematic understanding and real-time feedback capability for x-ray free electron laser (FEL) accelerator optical components are critical scientific experiments instrument performance.Single-shot wavefront sensing enables characterization of the intensity local electric field distribution at sample plane, something that is important such as nonlinear studies.It can also provide alignment tuning FEL beam instrumentation optics, leading to optimal performance greater operational efficiency.A robust, sensitive, accurate single-shot sensor beams using single grating Talbot interferometry has been developed.Experiments performed Linac Coherent Light Source (LCLS) demonstrate 3σ sensitivity accuracy, both better than λ∕100, retrieval hard (λ 0.13 nm, E 9.5 keV) wavefronts in 3D.Exhibiting high from unfocused focused beams, same setup be used systematically study output, transport endstation focusing optics.This technique extended use with softer harder x rays modified configurations.