Speaker
Description
The TRIUMF Ultra Cold Advanced Neutron (TUCAN) Collaboration has commissioned a new spallation-driven ultra cold neutron (UCN) source that provides unprecedented UCN density for conducting the next generation of precision nEDM measurements. A UCN Detector System capable of efficient operation at high UCN flux and with low backgrounds will be important for completing this precision measurement. This talk will present the performance of a newly-commissioned scintillating-gas UCN detector for TUCAN that employs $\text{CF}_4+{}^3\text{He}$ gas technology. The detector's energy and timing resolution, background level and efficiency relative to separate ${}^6\text{Li}$ based UCN detector, were measured with the TUCAN source as a function of UCN flux. These performance results will be directly compared to separate UCN detector ${}^6\text{Li}$ based UCN detector. Results from a detailed GEANT4 simulation used to characterize the sources of efficiency loss in the scintillating-gas detector will also be presented.