Speaker
Description
We present the latest developments of the LIME underground data taking campaign at Laboratori Nazionali del Gran Sasso (LNGS). The LIME detector is the largest 50 L prototype of the CYGNO/INITIUM project, whose aim is to build a large gaseous Time Projection Chamber (TPC) with optical readout using a He:CF4 gas mixture for directional Dark Matter spin-dependent and spin-independent searches. Within the LIME detector, the primary ionisation charges resulting from particle interactions are amplified by a triple Gas Electron Multiplier (GEM). During the amplification process, scintillation visible light is produced and is readout by a CMOS-based Active Pixel Sensor and a set of four fast Photomultiplier Tubes (PMTs). This approach enables detailed 3D event reconstruction while keeping the sensors outside the sensitive volume, thereby reducing background contamination. LIME exhibited linearity in the response to electron recoils from 4 keV to 40 keV and a very good discriminating power between electron and nuclear recoils above 20 keV. The results obtained in the five data-taking runs performed underground in the LNGS will be presented. Given the success of the LIME campaign, we are realising a larger 0.4 m$^3$ demonstrator, called CYGNO04, to be deployed at the LNGS between the end of 2024 and 2026 to demonstrate the scalability of the project and the performances of our experimental technique on a larger volume scale.
| Primary experiment | CYGNO |
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