Speaker
Description
Eos is a 20-tonne optical detector located at the University of California, Berkeley, with the primary goal of demonstrating the hybrid Cherenkov and scintillation light detection technique. The Eos detector features ultra-fast photomultiplier tubes, photon-sorting dichroicons, a four-tonne inner target volume, and a suite of optical and radioactive calibration sources. Eos data-taking started with a water target. Measurements with laser balls, gamma and neutron sources, directional beta sources, and cosmic-rays have been performed to calibrate the detector, characterize the optical response, and validate the reconstruction algorithms. Since then, Eos has extended the data-taking to scintillating target materials, including water-based liquid scintillator, LAB/PPO, etc. These datasets are being used to characterize the optical models and evaluate reconstruction performance across different target materials. This contribution will present Eos's water-phase performance results, as well as the current status and planned data-taking at UC Berkeley.