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We investigate a radiative seesaw model under a non-holomorphic modular S <SUB>3</SUB> flavor symmetry, addressing neutrino masses, dark matter candidates, and lepton flavor violations. Neutrino masses arise at the one-loop level, and we confront the model with neutrino oscillation data, lepton flavor violation bounds, and relic density requirements through a chi-square analysis. By incorporating the latest JUNO results, we find that the allowed parameter space is strongly constrained: For the normal hierarchy, both fermionic and bosonic dark matter scenarios remain viable but highly localized, whereas for the inverted hierarchy with fermionic dark matter no allowed region survives. These findings demonstrate that JUNO provides decisive constraints and that our framework is highly predictive.

DUNE (Deep Underground Neutrino Experiment) is a long-baseline neutrino oscillation experiment currently under construction, whose far detectors will be the largest liquid argon time projection chambers ever built. This detector design calls for custom-built cryogenic front-end electronics to meet its performance requirements. This paper describes the charge readout electronics that will be used in the DUNE horizontal drift (HD) far detector and presents performance results using data from the ProtoDUNE-HD detector, a 770 ton liquid argon time projection chamber operated at the CERN Neutrino Platform in 2024 that served as the final prototype of the DUNE HD design.