Develop monitors for MW-power proton beam at J-PARC extraction beamline for neutrino experiments

Intense and well-characterized neutrino sources, coupled with large and high-performance detectors, are essential for elucidating the unknowns in leptonic mixing through neutrino oscillation measurements. The J-PARC accelerator and neutrino extraction beamline have recently undergone upgrades, successfully delivering an 800-kW beam. We discuss the development, recent findings, and outstanding challenges associated with a non-destructive beam-induced fluorescence monitor and optical-fiber-based beam loss monitors.