Overview of the Eos Demonstrator Muon Veto System

Eos is a technology demonstrator for hybrid scintillator and Cherenkov neutrino detectors. Cosmic muons are both a source of background events and a calibration tool for the Eos detector. Eos is surrounded by 68 BC408 plastic scintillator paddles - each with two independent slats - to specifically tag muons as they enter the main detector volume, forming the Muon Veto System. Scintillation light from each slat is measured by individual Hamamatsu R5946 38mm photomultiplier tubes (PMTs). Each PMT is connected to custom-designed comparator cards, ultimately producing digital logic pulses which are fed into an Enclustra XU5+PE-3-100 system on module with a built-in 148 input/output field-programmable gate array (FPGA). The FPGA is used to produce two user-customizable logic trigger/veto outputs which are then sent to the primary Eos data acquisition system, allowing for the full Eos detector to be triggered by events in the muon paddles. In this talk I will give an overview of the Eos detector, the muon readout hardware, and discuss the commissioning and initial results of the full muon veto system.