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TY - UNPB AU - Zhang, L. AU - Cocco, D. AU - Kelez, N.M. AU - Morton, D.S. ED - Casas, Joan ED - Schaa, Volker RW ED - Costa, Isidre ED - López, David ED - Prieto, Montserrat TI - LCLS-II KB Mirror Systems: Technical Challenges and Solutions J2 - Proc. of MEDSI2016, Barcelona, Spain, 11-16 September 2016 CY - Barcelona, Spain T2 - Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation Conference T3 - 9 LA - english AB - Based on the success of the Linac Coherent Light Source (LCLS) at the SLAC National Accelerator Laboratory, the Department of Energy has funded the LCLS-II - a billion-dollar project. In addition to the existing LCLS copper linac that delivers FEL pulses at 120 Hz, the LCLS-II project will provide a 4 GeV superconducting (SC) linear accelerator to deliver high-repetition-rate FEL pulses, up to 1 MHz. The average power of the FEL beam from the SC linac will range from 20 to 200 W, and potentially to 600 W. The FEL beam has ultra-short pulse length (down to a few fs), narrow energy band width (down to less than 10⁻⁴, thanks to self-seeding technology), and is fully coherent beam. The preservation of the wavefront is essential to maintain the outstanding FEL beam properties. In this paper, we will describe the technical challenge of the optics design to preserve the FEL beam wavefront. We will focus on the KB mirror system for LCLS-II instruments. We will especially discuss the aspects of cooling technology to minimize the thermal deformation and the management and minimization of the mechanical coupling between the mirror bending and the cooling. PB - JACoW Publishing CP - Geneva, Switzerland ER -