MS20-P09 Results and Experience using Recycled Beam at the CXI Instrument of LCLSBeam time at X-ray Free Electron Lasers (FELs), such as the Linac Coherent Light Source (LCLS), is currently oversubscribed several fold. At LCLS, multiplexing has been used to increase access by using a monochromator to extract a 0.5 or 1 eV slice of the pink beam bandwidth (~50 eV) and deliver it to a different experiment; this setup is commonly used for multiplexing of the monochromatized beam at X-ray Pump Probe (XPP) and Coherent X-ray Imaging (CXI) instruments. However, many experiments at CXI utilize a small fraction (< 50%) of the incident beam due to a combination of small scattering cross sections and < 50 µm path lengths. Therefore a new chamber and re-focusing optics were designed to make use of the transmitted beam from a primary experiment at CXI. The Serial Sample Chamber (SSC) was commissioned in July of 2016 and started parasitic operations immediately, contributing to single-wavelength anomalous difference (SAD) protein crystallography experiments conducted the same month. Since its successful commissioning, in-house experiments and user experiments have been conducted in SSC, expanding the amount of available beam time to the community. Starting in 2017, SSC became the dedicated place for the Protein Crystallography Screening (PCS) program at LCLS. Results from using SSC for experiments and the quality of the recycled beam will be discussed including discussions of the challenges facing the parasitic experimental setup. The serial data collection setup will soon be implemented at European XFEL at the SPB/SFX instruments.
Keywords: Crystallography, X-ray FEL