The possibility to detect and characterise spatially resolved ionization tracks generated by particle interactions is an highly sought-after capability in many classes of detectors, with broad applications across particle and astroparticle physics. In this talk we will present the innovative optical 3D readout approach for TPCs recently developed by the CYGNO/INITIUM collaboration. This is based on the use of a scientific CMOS (sCMOS) camera and a PMT to readout the secondary scintillation light produced in the TPC amplification stage (typically, by a GEMs stack). The time profile of the scintillation light measured by the PMT provide the track pattern along the drift direction (dZ), complementing the X-Y projection provided by the sCMOS for 3D track reconstruction with high granularity. The use of low diffusion gas mixtures or negative ion drift opearation can allow to significantly extend the drift region without critical degradation of the performances and/or improved tracking capabilities. We will discuss the most recent results obtained in the optimisation of such technique for directional Dark Matter searches, including the first ever demonstration of atmospheric pressure negative ion drift operation with an optical readout. We will furthermore illustrate additional current developments of this approach in the context of Solar neutrinos spectroscopy, directional environmental neutron detection, Migdal effect measurement and x-ray polarimetry in space.
Meeting ID: 662 5356 7797
Saime Gürbüz, Maike Hansen, Tatjana Lenz