“…Since then, there have been many developments in optical readouts for diverse applications such as particle detection [198,199,200,201], thermal neutron imaging [202,203,204], and gas detector microphysics measurements [205,206], to name a few. For direction-sensitive Dark Matter detection, these developments include studies of the photon yields of various gas mixtures, measurements of the emission spectra as a function of gas mixture and pressure, and discrimination and directionality studies using a GEM-based detector with high spatial resolution and signal-tonoise in low-pressure CF 4 gas.…”