Abstract: A polarization-multiplexed radiator system, preferably including one or more electron splitters, undulator networks, electron combiners, and/or optics, and preferably integrated into a light source system that can include one or more accelerator modules and/or radiator modules. A method of operation, preferably including receiving high-energy electrons, separating electrons, and/or generating optical outputs S330, and optionally including separating outputs, providing the optical outputs, and/or outputting electrons.