First results for the pLGAD sensor for low-penetrating particles

Abstract

Silicon sensors are the go-to technology for high-precision sensors in particle physics. But only recently low-noise silicon sensors with internal amplification became available. The so-called Low Gain Avalanche Detector (LGAD) sensors have been developed for applications in High Energy Physics, but lack two characteristics needed for the measurement of low-energy protons (<60keV): a thin entrance window (in the order of tens of nm) and the efficient amplification of signals created near the sensor’s surface (in a depth below 1µm).In this paper we present the so-called proton Low Gain Avalanche Detector (pLGAD) sensor concept and some results from characterisation of the first prototypes of the sensor. The pLGAD is specifically designed to detect low-energy protons, and other low-penetrating particles. It will have a higher detection efficiency than non-silicon technologies, and promises to be a lot cheaper and easier to operate than competing silicon technologies.