2019 Physics/Theoretical Colloquium Thursday, July 11th , 2019 3:45 – 4:45 p.m. Physics Auditorium (TA-3-0215-182) Refreshments at 3:15pm Speaker: Dr. Tor Raubenheimer Professor of Particle Physics and Astrophysics Assistant Director for Accelerator Research, Stanford Linear Accelerator Center “Novel beam manipulation techniques for the SLAC LCLS-II X-ray FEL” Abstract: The LCLS-II is a CW X-ray FEL covering a photon spectral range from 0.2 to 5 keV that is being constructed at the SLAC National Accelerator lab. It is based on a 4 GeV SRF linac installed in the 1st km of the SLAC linac tunnel. This talk will describe a high energy upgrade, referred to as the LCLS-II-HE, which will increase the beam energy to 8 GeV and the photon spectral range to 12.8 keV; this range may be extended through 20 keV with improvements of the electron injector and beam transport. The talk will describe key challenges of the upgrade and will also discuss R&D towards further performance enhancements.