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Description
In modern astroparticle physics experiments, it is crucial to feature a tracker and a calorimeter to measure and identify primary charged cosmic rays; at the same time, it is necessary to distinguish those from the back scattered particles entering the tracker from the calorimeter.Time-of-flight measurements are also used for particle identification. In recent years, Low Gain Avalanche Detectors (LGADs) have emerged as a technological solution for precise timing measurements in the tens of ps range for High Energy Physics and other applications. In this field, the typical LGAD channel size is O(1 mm2), whereas a silicon sensor for strip geometry in space application is 50-60 cm in length with 100-200 μm pitch, resulting in a channel area of about 1 cm2. This work presents the timing characterization of pad sensors with dimensions up to 1 cm× 1 cm (with and without gain) using a picosecond infrared laser. Different sensor thicknesses are characterized to reduce the effect of capacitance on the timing performances. In addition to that, several gain structures are compared to find the best performing gain layer.
