Speaker
Description
The Eos detector is a ton-scale testbed for next-generation neutrino experiments, evaluating novel liquid scintillator technologies including water-based liquid scintillator (WbLS). A key requirement for WbLS development is the ability to separate Cherenkov and scintillation light, motivating controlled calibration studies with well-defined electron sources. To support these studies, we have developed a novel calibration device, the directional beta source, which collimates electrons emitted from radioactive isotopes. The system operates at rates of order 1 Hz using 90Sr and 106Ru and incorporates a compact self-triggering mechanism that provides an external trigger to Eos on an event-by-event basis as electrons exit the source. This design enables precise timing and efficient background suppression. This poster describes the design, mechanical construction, radioactive source integration, and operational deployment of the directional beta source in Eos.