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Both the spectrum and primary scintillation yields of Argon-CF4 mixtures have been measured with an x-ray tube and an alpha source, respectively, in a broad range of concentrations and pressures. Scintillation both in the UV and VIS bands is clearly noticeable for as little as 0.1% of CF4 in the mixture, part of it being attributable to transfer reactions between the excited argon states and the CF4 molecules.The large scintillation yields and short time constants of the emission, together with spectral characteristics that are suitable for SiPM detection, could in principle allow time tagging in large-volume Ar-based gaseous time projection chambers (TPCs), like the one of ND-GAr, down to an energy threshold around 1 MeV, with ns-resolution. Combined with appropriate amplification structures, like Glass GEMs and the potent Timepix cameras, a full optical readout with 2 mm space sampling can be achieved.In order to test this full-optical readout concept an optical TPC has been assembled and instrumented at the Galician Institute of High Energy Physics (IGFAE). This detector has been operated successfully at 1 bar and 99/1 Argon-CF4, showing the viability of this kind of technology
Paolo Beltrame