Speaker
Description
In recent years, development of pixel detectors has evolved from only improving the spatial resolution to also improving the temporal resolution.
The ultimate goal is to develop a 4 Dimensional tracking (4D tracking) system capable of combining micrometer spatial resolution with a temporal resolution in the order of tens of picoseconds. Sensor types such as Low-Gain-Avalanche-Detectors (LGADs) provide a promising avenue for detectors with excellent time resolution due to their intrinsic gain. To achieve a good spatial resolution, segmentation into small pixels in the order of 50 micron is required. The introduction of trench isolation to the LGAD production process, producing the Trench-Isolated-LGADs (TI-LGADs), enables the technology to achieve the necessary segmentation for use in 4D tracking.
The first TI-LGAD production by FBK allowed for miniaturization of pixels down to 55 micron pitch. When connected to the Timepix4 readout ASIC, to form a fully hybridized system, the achieved time resolution was below $100\, \mathrm{ps}$. However, the gain region of the devices was limited to only the innermost 50% of the area. Second generation TI-LGADs, produced at FBK with the goal of increasing this gain region, have been hybridized using the Timepix4 readout ASIC in order to evaluate their performance.
In this contribution we will present recent test beam and lab results of second generation assemblies. Special attention is given to comparing the performance of these TI-LGAD devices, concerning active gain region and achieved timing resolution, to the first generation devices.
