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Next-generation megawatt-scale neutrino beams open the way to studyingneutrino-nucleus scattering resorting, for the first time, to gaseous targets.This could lead to deeper knowledge of neutrino cross sections in the energyregion between hundreds of MeV and a few GeV, of interest for the upcominggeneration of long-baseline neutrino oscillation experiments. The challenge is,therefore, to accurately track and (especially) time the particles produced inneutrino interactions in large and seamless volumes down to few-MeV energies.We propose to accomplish this through an optically-read time projection chamber(TPC) filled with high-pressure argon and equipped with both tracking andtiming functions. In this work, we present a detailed study of the time-taggingcapabilities of such a device, based on end-to-end optical simulations thatinclude the effect of photon propagation, photosensor response, dark-count rateand pulse reconstruction. We show that the neutrino interaction time could bereconstructed from the primary-scintillation signal with a precision in therange 1--2.5~ns ($\sigma$) for point-like deposits with energies down to 5~MeV,and well below 1~ns for minimum-ionizing particle tracks. A discussion onprevious limitations towards such a detection technology, and how they can berealistically overcome in the near future thanks to recent developments in thefield, is presented (particularly the strong scintillation yields recentlyreported for Ar/CF$_4$ mixtures). The performance presented in our analysisseems to be well within reach of next-generation neutrino-oscillationexperiments through the instrumentation of the proposed TPC with conventionalreflective materials and a SiPM carpet behind a transparent cathode.

On the determination of the interaction time of GeV neutrinos in large argon gas TPCs