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TY - CONF AU - Schneidmiller, E. AU - Brinker, F. AU - Decking, W. AU - Geloni, G. AU - Gerasimova, N. AU - Grünert, J. AU - Guetg, M.W. AU - Karabekyan, S. AU - Kujala, N.G. AU - Laksman, J. AU - Li, Y. AU - Liu, J. AU - Liu, S. AU - Maltezopoulos, Th. AU - Nölle, D. AU - Petrov, I. AU - Samoylova, L. AU - Scholz, M. AU - Serkez, S. AU - Sinn, H. AU - Wolff-Fabris, F. AU - Yurkov, M.V. AU - Zagorodnov, I. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Harmonic Lasing Experiment at the European XFEL J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - Harmonic lasing 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 a much more intense, stable, and narrow-band FEL beam. Another interesting application is Harmonic Lasing Self-Seeding (HLSS) that allows to improve the longitudinal coherence and spectral power of a Self-Amplified Spontaneous Emission (SASE) FEL. This concept was successfully tested at FLASH 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 Angstrom and 2.8 Angstrom, in the latter case obtaining both 3rd and 5th harmonic lasing. PB - JACoW Publishing CP - Geneva, Switzerland SP - 29 EP - 32 KW - FEL KW - undulator KW - electron KW - laser KW - free-electron-laser DA - 2019/11 PY - 2019 SN - "" SN - 978-3-95450-210-3 DO - doi:10.18429/JACoW-FEL2019-TUA04 UR - http://jacow.org/fel2019/papers/tua04.pdf ER -