Speaker
Description
The LEMING experiment aims to test weak equivalence in leptonic antimatter. We will employ atomic interferometry to measure the vertical deviation of a horizontal cold muonium beam. Generation of cold muonium requires the experiment to operate well below 1K. Therefore, particle detectors operating reliably at these temperatures are crucial. We have successfully achieved sub-kelvin operation of commercial silicon photomultipliers (SiPMs). Furthermore, a strong background suppression is required in order to reach the intended sensitivity. This can be achieved via a reliable detection of the atomic electron from the muonium, left over after the decay of the muon. However, these electrons possess very low energies. Hence, a second detector is required which not only operates below 1K, but also features an energy detection threshold below 1keV. This talk will focus on our sub-kelvin characterisation of commercial SiPMs as well as several low-threshold technologies we are investigating, including superconducting nanowires and perovskite scintillators.
