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

Journal Article · · Optica

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

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1463051
Alternate ID(s):
OSTI ID: 1462999
Report Number(s):
slac-pub-17308
Journal Information:
Optica, Journal Name: Optica Vol. 5 Journal Issue: 8; ISSN 2334-2536
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 42 works
Citation information provided by
Web of Science

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Cited By (6)

High-accuracy wavefront sensing for x-ray free electron lasers text January 2018
Wavefront sensing at X-ray free-electron lasers journal June 2019
Wavefront sensing at X-ray free-electron lasers text January 2019
Focal shift induced by source displacements and optical figure errors journal August 2019
Characterizing the intrinsic properties of individual XFEL pulses via single-particle diffraction journal January 2020
Auto-alignment of X-ray focusing mirrors with speckle-based at-wavelength metrology journal January 2018

Figures / Tables (6)


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