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TY - UNPB AU - Krejcik, P. ED - Liu, Zhengzheng ED - Lidia, Steven ED - McCausey, Amy ED - Schaa, Volker RW TI - Diagnostic Challenges at LCLS-II and Lessons Learned from LCLS-I at SLAC J2 - Proc. of IBIC2017, Grand Rapids, MI, USA, 20-24 August 2017 C1 - Grand Rapids, MI, USA T2 - International Beam Instrumentation Conference T3 - 6 LA - english AB - SLAC is replacing the first km of its 3-km linac with a CW superconducting linac at 1.3 GHz for the LCLS-II x-ray FEL. A laser will drive a normal-conducting 186-MHz CW photocathode gun with arbitrary pulse separation at up to 1 MHz. In addition to the standard SASE x-ray beam, users will continue to have access to special operating modes such as seeded beams or double pulses with selectable separation and wavelength separation. The accelerator will begin operation with an average power of 240 kW, later rising to 1 MW. The existing 120-Hz LCLS-I copper linac will operate simultaneously in the third km. A pulsed beam "spreader" can direct each pulse from each linac into one of two new undulators, for hard and soft x rays, or into a dump. This talk will discuss the extensive measurements and feedbacks along the 4-km path that are in preparation to monitor and maintain beam quality and FEL performance through this wide parameter range. PB - JACoW CP - Geneva, Switzerland ER -