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TY - CONF AU - Schneidmiller, E. AU - Faatz, B. AU - Kuhlmann, M. AU - Rönsch-Schulenburg, J. AU - Schreiber, S. AU - Tischer, M. AU - Yurkov, M.V. ED - Chin, Yong Ho ED - Zhao, Zhentang ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker RW TI - Harmonic Lasing in X-Ray FELs: Theory and Experiment J2 - Proc. of FLS2018, Shanghai, China, 5-9 March 2018 C1 - Shanghai, China T2 - ICFA Advanced Beam Dynamics Workshop T3 - 60 LA - english AB - Harmonic lasing in XFELs is an opportunity to extend operating 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 which is easier to handle due to the suppressed fundamental. Another interesting application of harmonic lasing is Harmonic Lasing Self-Seeded (HLSS) FEL*,** that allows to improve longitudinal coherence and spectral power of a SASE FEL. Recently*** this concept was successfully tested at FLASH2 in the range 4.5 - 15 nm. That was also the first experimental demonstration of harmonic lasing in a high-gain FEL and at a short wavelength (before it worked only in infrared FEL oscillators). In this contribution we describe the concepts of harmonic lasing and of HLSS FEL, and present the experimental results from FLASH2. PB - JACoW Publishing CP - Geneva, Switzerland SP - 68 EP - 73 KW - ion KW - FEL KW - undulator KW - electron KW - radiation DA - 2018/06 PY - 2018 SN - 978-3-95450-206-6 DO - 10.18429/JACoW-FLS2018-TUP2WA03 UR - http://jacow.org/fls2018/papers/tup2wa03.pdf ER -