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TY - CONF AU - Lechner, C. AU - Azima, A. AU - Aßmann, R.W. AU - Bödewadt, J. AU - Dohlus, M. AU - Drescher, M. AU - Ekanayake, N. AU - Feng, G. AU - Hartl, I. AU - Khan, S. AU - Laarmann, T. AU - Lang, T. AU - Maltezopoulos, Th. AU - Plath, T. AU - Roßbach, J. AU - Winkelmann, L. AU - Wurth, W. AU - Zagorodnov, I. ED - Bishofberger, Kip:Carlsten, Bruce (LANL, Los Alamos, NM, USA)[ORCID:0000-0001-5619-907X] ED - Schaa, Volker RW TI - Concept for a Seeded FEL at FLASH2 J2 - Proc. of FEL2017, Santa Fe, NM, USA, August 20-25, 2017 C1 - Santa Fe, NM, USA T2 - International Free Electron Laser Conference T3 - 38 LA - english AB - The free-electron laser (FEL) FLASH is a user facility delivering photon pulses down to 4 nm wavelength. Recently, the second FEL undulator beamline 'FLASH2' was added to the facility. Operating in self-amplified spontaneous emission (SASE) mode, the exponential amplification process is initiated by shot noise of the electron bunch resulting in photon pulses of limited temporal coherence. In seeded FELs, the FEL process is initiated by coherent seed radiation, improving the longitudinal coherence of the generated photon pulses. The conceptual design of a possible seeding option for the FLASH2 beamline envisages the installation of the hardware needed for high-gain harmonic generation (HGHG) seeding upstream of the already existing undulator system. In this contribution, we present the beamline design and numerical simulations of the seeded FEL. PB - JACoW CP - Geneva, Switzerland SP - 34 EP - 37 KW - ion KW - FEL KW - electron KW - laser KW - undulator DA - 2018/02 PY - 2018 SN - 978-3-95450-179-3 DO - 10.18429/JACoW-FEL2017-MOP003 UR - http://jacow.org/fel2017/papers/mop003.pdf ER -