Speaker
Description
Liquid xenon (LXe) is widely used in various neutrino and dark matter experiments, including the next-generation searches for dark matter and neutrinoless double beta decay, DARWIN and nEXO. LXe scintillates in vacuum ultraviolet (VUV) region, and understanding reflectance and transmittance of materials and photodetection efficiency (PDE) of photosensors in this region is important for optimizing energy resolution and sensitivity of these experiments. LIXO2 is a setup dedicated to such measurements that was constructed at the University of Alabama. Its first version has already provided the first measurement of angular-resolved PDE and reflectivity of a SiPM in LXe. LIXO2 is an upgrade that improves measurement speed, reduces uncertainties, and enables transparency measurements in LXe. Apart from measuring construction materials and photosensors, the setup could be used to infer other fundamental optical properties, such as refractive index of liquid xenon. This talk will present the design, performance, simulation, and latest results of LIXO2, which are relevant for the next-generation rare event searches in liquid xenon.
