Recent Developments in the Accelerator Neutrino Nucleon Interaction Experiment (ANNIE)

The Accelerator Neutrino Nucleon Interaction Experiment (ANNIE) at Fermilab features a Gadolinium-loaded water Cherenkov detector positioned in the Booster Neutrino Beam (BNB). Dedicated to measuring the final-state neutron multiplicity in neutrino-nucleus interactions, ANNIE's crucial assessment of neutron yield as a function of outgoing lepton kinematics contributes to constraining systematic uncertainties and alleviating biases in upcoming long-baseline oscillation and cross-section experiments. Beyond its primary mission, ANNIE serves as a testbed for cutting-edge neutrino detection technologies, including Large Area Picosecond Photodetectors (LAPPDs) and Water-based Liquid Scintillators (WbLS) technology. ANNIE stands out as the first neutrino experiment utilizing Large Area Picosecond Photodetectors (LAPPDs), showcasing their potential in water Cherenkov detectors and revolutionizing photodetection-based neutrino detector technology. This presentation will provide insights into the ANNIE detector system, its current status, and recent highlights.