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TY - UNPB AU - Zhang, L. ED - Schaa, Volker RW ED - Tavakoli, Keihan ED - Tilmont, Manuel TI - Mechanical Engineering Instrument Design and Development for LCLS-II J2 - Proc. of MEDSI2018, Paris, France, 25-29 June 2018 C1 - Paris, France T2 - Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation T3 - 10 LA - english AB - The high-repetition-rate FELs will enable a broad range of high-resolution, coherent pump probe experiments over a large photon energy range. On top of the extreme high peak power of the FEL, the average power of this high-repetition-rate FEL reaches several hundred watts. This combination of extreme high peak power and high average power becomes very challenging for the X-ray optics to preserve the FEL beam quality. As an example for X-ray optics - water cooled and dynamically bendable KB mirror, minimizing thermal deformation, bending the mirror to perfect ellipse shape. Managing the beam power of soft X-ray FEL with high energy per pulse and high average power needs windowless gas attenuator with differential pumping system. FEL beam from two different sources (SXR and HXR) or to split femtosecond FEL pulses and recombine them with a precisely adjustable delay opens numerous scientific applications such X-ray pump X-ray probe. The complexity of a delay system for LCLS-II includes multiple bounce crystals requiring femtosecond time delay accuracy and with the possibility of photon energy scan. In this paper, we will highlight design and development of these systems at LCLS. PB - JACoW Publishing CP - Geneva, Switzerland ER -