Compact coherence enhancement by subharmonic self-seeding in X-ray free-electron laser facilities

Journal of Synchrotron Radiation
Eduard Prat, Sven Reiche

Abstract

X-ray free-electron lasers (FELs) are cutting-edge scientific tools able to generate transversely coherent radiation with very high power and ultra-short pulse durations. The self-seeding mechanism has been proven to increase the longitudinal coherence of the FEL radiation but its efficiency could be significantly improved, especially for soft X-rays. This paper proposes the enhancement of the performance of self-seeding by combining it with the harmonic generation mechanism. In particular, by starting the process with a subharmonic of the wavelength of interest, the coherence of the produced radiation is improved, the undulator beamline becomes more compact, and the monochromator realization is simplified. Numerical simulations for SwissFEL are presented showing that the method can be employed, within a given space, to increase the spectral brightness by one order of magnitude or more with respect to standard self-seeding. This coherence enhancement will be fundamental for many photon science applications and techniques such as resonant inelastic X-ray scattering.

References

Dec 2, 2000·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·Z Huang, K J Kim
Apr 12, 2006·Physical Review Letters·B W J McNeilN R Thompson
Mar 5, 2009·Physical Review Letters·G Stupakov
Feb 24, 2015·Physical Review Letters·D RatnerJ Wu
Jul 1, 2016·Journal of Synchrotron Radiation·Eduard PratThomas Schmidt
Jul 1, 2016·Journal of Synchrotron Radiation·Sven Reiche, Eduard Prat

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Citations

Jul 6, 2019·Journal of Synchrotron Radiation·Rafael AbelaRomain Ganter

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Methods Mentioned

BETA
X-ray

Software Mentioned

Genesis
SwissFEL

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