External Facilities User Facilities and Synchrotron Experiments We maintain great collaborations with scientists at multiple facilities around the world. Canadian Light Source (CLS) BESSY II European Synchrotron Radiation Facility (ESRF) Linear Coherent Light Source (LCLS at SLAC) Advanced Light Source (ALS) Advanced Photon Source (APS) National Synchrotron Light Source II (NSLS – II)