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TY - CONF AU - Schneidmiller, E. AU - Balandin, V. AU - Decking, W. AU - Dohlus, M. AU - Geloni, G. AU - Golubeva, N. AU - Li, Y. AU - Molodtsov, S. AU - Nölle, D. AU - Pflüger, J. AU - Serkez, S. AU - Sinn, H. AU - Tanikawa, T. AU - Tomin, S. AU - Yurkov, M.V. AU - Zagorodnov, I. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Considerations for the Ultrahard X-ray Undulator Line of the European XFEL J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The European XFEL is a multi-user X-ray FEL facility based on superconducting linear accelerator. Presently, three undulators (SASE1, SASE2, SASE3) routinely deliver high-brightness soft- and hard- X-ray beams for users. There are two empty undulator tunnels that were originally designed to operate with spontaneous radiators in the range 20-90 keV. We consider, instead a possible installation of two FEL undulators. One of them (SASE4) is proposed for operation in a standard (7-25 keV) range as well as in ultrahard (25-100 keV) regime. We discuss a possible location and length of SASE4, modifications of electron beam transport, beam dynamics, choice of undulator technology, different operation modes (SASE and advanced lasing concepts) etc. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1732 EP - 1735 KW - undulator KW - FEL KW - photon KW - electron KW - operation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPRB023 UR - http://jacow.org/ipac2019/papers/tuprb023.pdf ER -