Speaker
Description
Low Gain Avalanche Detectors (LGADs) are characterized by a fast rise time (~500ps) and extremely good time resolution (down to 17ps). For the application of this technology to near future experiments, the intrinsic low granularity of LGADs and the large power consumption of readout chips for precise timing is problematic. AC-coupled LGADs, where the readout metal is AC-coupled through an insulating oxide layer, could solve both issues at the same time thanks to the 100% fill factor and charge-sharing capabilities.
Extensive characterization of AC-LGAD devices with both laser TCT and probe station (IV/CV) will be shown in this contribution, comparing the effect of various parameters among the readout electrode dimensions (strip/pad metal contact length and width, pitch) and sensor production details (manufacturer, N+ layer resistivity, dielectric capacitance, bulk thickness, doping of the gain layer). We will present the first results on AC-LGADs irradiated with 1 MeV reactor neutrons at JSI/Ljubljana to fluences on the order of 1e13 to 1e15 n/cm2. Using a rotational stage in our laser TCT system, we will show our initial investigation of charge sharing in AC-LGADs for hits incident on the sensor at an angle to evaluate the effect of the tilted installation which is typical for silicon pixel and strip sensor modules in tracking detectors.
| Primary experiment | ePIC experiment |
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