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Systematic uncertainties in accelerator oscillation neutrino experimentsarise mostly from nuclear models describing neutrino-nucleus interactions. Tomitigate these uncertainties, we can study neutrino-nuclei interactions withdetectors possessing enhanced hadron detection capabilities at energies belowthe nuclear Fermi level. Gaseous detectors not only lower the particledetection threshold but also enable the investigation of nuclear effects onvarious nuclei by allowing for changes in the gas composition. This approachprovides valuable insights into the modelling of neutrino-nucleus interactionsand significantly reduces associated uncertainties. Here, we discuss the designand first operation of a gaseous argon time projection chamber optically read.The detector operates at atmospheric pressure and features a single stage ofelectron amplification based on a thick GEM. Here, photons are produced withwavelengths in the vacuum ultraviolet regime. In an optical detector theprimary constraint is the light yield. This study explores the possibility ofincreasing the light yield by applying a low electric field downstream of theThGEM. In this region, called the electroluminescence gap, electrons propagateand excite the argon atoms, leading to the subsequent emission of photons. Thisprocess occurs without any further electron amplification, and it isdemonstrated that the total light yield increases up to three times by applyingmoderate electric fields of the order of 3~kV/cm. Finally, an indirect methodis discussed for determining the photon yield per charge gain of a ThGEM,giving a value of 18.3 photons detected per secondary electron.

Gaseous argon time projection chamber with electroluminescence enhanced optical readout