Raubenheimer, T.O. JACoW Publishing Geneva, Switzerland 978-3-95450-206-6 10.18429/JACoW-FLS2018-MOP1WA02 English 6-11 MOP1WA02 ion FEL linac SRF cryomodule Contribution to a conference proceedings 2018 2018-06 https://doi.org/10.18429/JACoW-FLS2018-MOP1WA02 http://jacow.org/fls2018/papers/mop1wa02.pdf The LCLS-II XFEL will be based on a 4 GeV CW SRF linac and will produce x-ray pulses at 1 MHz over the spectral range of 200 to 5,00 eV. The rf gun will be installed and tested in early 2018; cryomodules are being produced at Fermilab and Jefferson lab and shipped to SLAC; undulator segments are being fabricated at LBNL and measured at SLAC. In parallel, a High Energy upgrade will be described which would extend the linac to 8 GeV and increase the spectral range to 12.8 keV.