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TY - CONF AU - Forcat Oller, S. AU - Feng, Y. AU - Krzywiński, J. AU - Ortiz, E. AU - Rowen, M. AU - Wang, H. ED - Schaa, Volker RW ED - Tavakoli, Keihan ED - Tilmont, Manuel TI - LCLS-II FEL Photon Collimators Design 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 unique capabilities of LCLS, the world's first hard X-ray FEL, have had significant impact on advancing our understanding across a broad range of science. LCLS-II, a major upgrade of LCLS, is being developed as a high-repetition rate X-ray laser with two simultaneously operating FELs. It features a 4 GeV continuous wave superconducting Linac capable of producing ultrafast X-ray laser pulses at a repetition rate up to 1 MHz and energy range from 0.25 to 5 keV. The LCLS-II upgrade is an enormous engineering challenge not only on the accelerator side but also for safety, machine protection devices and diagnostic units. A major part of the beam containment is covered by the FEL beam collimators. The current collimator design is no longer suitable for the high power densities of the upcoming LCLS-II beam. Therefore, a complete new design has been conceived to satisfy this new constrains. Moreover, a special FEL miss-steering detection system based on a photo diodes array has been designed as an integral part of the photon collimator as additional safety feature. This poster describes the new LCLS-II FEL Collimators, their mechanical design and challenges encountered. PB - JACoW Publishing CP - Geneva, Switzerland SP - 358 EP - 360 KW - photon KW - FEL KW - linac KW - undulator KW - laser DA - 2018/12 PY - 2018 SN - 978-3-95450-207-3 DO - 10.18429/JACoW-MEDSI2018-THPH11 UR - http://jacow.org/medsi2018/papers/thph11.pdf ER -