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TY - CONF AU - Douglas, D. AU - Angal-Kalinin, D. AU - Benson, S.V. AU - Charles, T.K. AU - Powers, T. AU - Roblin, Y. AU - Satogata, T. AU - Tennant, C. AU - Thompson, N. AU - Wheelhouse, A.E. AU - Williams, P.H. AU - York, R.C. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Architectural Considerations for Recirculated and Energy-Recovered Hard XFEL Drivers J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - A confluence of events motivates discussion of design options for hard XFEL driver accelerators. Firstly, multiple superconducting radio-frequency (SRF) driven systems are now online (European XFEL), in construction (LCLS-II), or in design (MARIE); these provide increasing evidence of the transformational potential they offer for fundamental science with its concomitant benefits. Secondly, operation of 12 GeV CEBAF* validates use of recirculation in high energy SRF linacs. Thirdly, advances in the analysis and control of effects such as coherent synchrotron radiation (CSR) and the microbunching instability (uBI) have been recently achieved. Collectively, these developments offer insights providing extended facility science reach, reduced costs, multiplicity (i.e., support of numerous FELs operating over a range of wavelengths), and enhanced scalability and upgradability (to higher powers and energies). We will discuss the relationship amongst the various threads, and indicate how they inform design choices for the system architecture of an option for the UK-XFEL** - that of a staged multi-user X-ray FEL and nuclear physics facility based on a multi-pass recirculating SRF CW linac. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4560 EP - 4563 KW - FEL KW - linac KW - recirculation KW - SRF KW - operation DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-THPMK106 UR - http://jacow.org/ipac2018/papers/thpmk106.pdf ER -