Harmonic Lasing of the European XFEL in the Angstrom Regime

Schneidmiller, E.; Brinker, F.; Decking, W.; Nölle, D.; Yurkov, M.V.; Zagorodnov, I.; Gerasimova, N.; Grünert,  J.; Kujala, N.G.; Laksman, J.; Li, Y.; Liu, J.; Maltezopoulos, Th.; Petrov, I.; Samoylova, L.; Serkez, S.; Sinn, H.; Wolff-Fabris, F.

Schneidmiller, E. ; Brinker, F. ; Decking, W.; Nölle, D. ; Yurkov, M.V.; Zagorodnov, I.; Gerasimova, N.; Grünert, J. ; Kujala, N.G.; Laksman, J.; Li, Y. ; Liu, J. ; Maltezopoulos, Th. ; Petrov, I.; Samoylova, L.; Serkez, S. ; Sinn, H. ; Wolff-Fabris, F.

2019

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Abstract

Harmonic lasing in XFELs is an opportunity to extend the photon energy range of existing and planned X-ray FEL user facilities. Contrary to nonlinear harmonic generation, harmonic lasing can provide much more intense, stable, and narrow-band FEL beam. Another interesting application is Harmonic Lasing Self-Seeding (HLSS) that allows to improve longitudinal coherence and spectral power of a Self-Amplified Spontaneous Emission (SASE) FEL. This concept was successfully tested at FLASH2 in the range of 4.5 - 15 nm and at PAL XFEL at 1 nm. In this contribution we present recent results from the European XFEL where we successfully demonstrated operation of HLSS FEL at 5.9 A, thus pushing harmonic lasing for the first time into the Angstrom regime.